diff --git a/amendments.js b/amendments.js
index 00c67df08..3b62afd55 100644
--- a/amendments.js
+++ b/amendments.js
@@ -1,11 +1,35 @@
 let amendments;
 var baseRec = document.createElement("html");
 
-function wrap(el, wrapper) {
-  if (el.tagName === "DIV" || el.tagName === "SECTION"  || el.tagName === "P"  || el.tagName === "DT"  || el.tagName === "DD"  || el.tagName === "LI") {
-    wrapChildren(el, wrapper);
+const PLUGIN_NAME = "amendments manager";
+
+const differ = new HTMLTreeDiff();
+
+function removeComments(el) {
+  // Remove HTML comments
+  const commentsIterator = document.createNodeIterator(el, NodeFilter.SHOW_COMMENT);
+  let comment;
+  while ((comment = commentsIterator.nextNode())) {
+    comment.remove();
+  }
+}
+
+function markInsertion(el, controller) {
+  const wrapper = document.createElement("ins");
+  if (el.tagName === "DIV" || el.tagName === "SECTION" || el.tagName === "DT"  || el.tagName === "DD"  || el.tagName === "LI") {
+    // special casing the case where <div> is used to group <dt>/<dd>
+    if (el.tagName === "DIV" && el.parentNode.tagName === "DL") {
+      for (let child of el.children) {
+	wrapChildNodes(child, document.createElement("ins"));
+      }
+      el.children[0].prepend(controller);
+    } else {
+      wrapChildNodes(el, wrapper);
+      el.prepend(controller);
+    }
   } else {
     wrapElement(el, wrapper);
+    el.parentNode.insertBefore(controller, el);
   }
 }
 
@@ -14,38 +38,30 @@ function wrapElement(el, wrapper) {
   wrapper.appendChild(el);
 }
 
-
-function wrapChildren(parent, wrapper) {
+function wrapChildNodes(parent, wrapper) {
+  // freeze the list by copying it in array
   const children = [...parent.childNodes];
-  if (children && children.length) {
-    parent.insertBefore(wrapper, children[0]);
+  if (children.length) {
+    parent.prepend(wrapper);
     for (let i in children) {
       wrapper.appendChild(children[i]);
     }
   }
 }
 
-function containerFromId(id) {
-  const container = baseRec.querySelector('#' + id);
-  if (!container) {
-    throw new Error(`Unknown element with id ${id} in Recommendation used as basis, see https://github.com/w3c/webrtc-pc/blob/main/amendments.md for amendments management`);
-  }
-  return container;
-}
-
 function titleFromId(id) {
-  const container = baseRec.querySelector('#' + id);
+  const container = baseRec.querySelector(`#${id}`) ?? document.getElementById(id);
   if (!container) return id;
   return container.closest("section").querySelector("h1,h2,h3,h4,h5,h6").textContent;
 }
 
-function listPRs(pr) {
+function listPRs(pr, repoURL) {
   const span = document.createElement("span");
   span.appendChild(document.createTextNode(" ("));
   pr = Array.isArray(pr) ? pr : [pr];
   for (let i in pr) {
     const number = pr[i];
-    const url = respecConfig.github.repoURL + "pull/" + number;
+    const url = repoURL + "pull/" + number;
     const a = document.createElement("a");
     a.href = url;
     a.textContent = `PR #${number}`;
@@ -79,7 +95,7 @@ function listTestUpdates(updates) {
 
 const capitalize = s => s[0].toUpperCase() + s.slice(1);
 
-async function listAmendments() {
+async function listAmendments(config, _, {showError}) {
   amendments = await fetch("amendments.json").then(r => r.json());
   baseRec.innerHTML = await fetch("base-rec.html").then(r => r.text());
 
@@ -90,22 +106,26 @@ async function listAmendments() {
   let consolidatedAmendments = {};
   for (let id of Object.keys(amendments)) {
     // validate that an amendment is not embedded in another
-    const container = containerFromId(id);
+    const container = document.getElementById(id) ?? baseRec.querySelector("#" + id);
+    if (!container) {
+      showError(`Unknown element with id ${id} identified in amendments, see https://github.com/w3c/webrtc-pc/blob/main/amendments.md for amendments management`, PLUGIN_NAME);
+      continue;
+    }
     if (amendments[id][0].difftype !== 'append') {
       const embedded = Object.keys(amendments).filter(iid => iid !== id).find(iid => container.querySelector("#" + iid));
       if (embedded) {
-	throw new Error(`The container with id ${id} marked as amended cannot embed the other container of amendment ${embedded}, see https://github.com/w3c/webrtc-pc/blob/main/amendments.md for amendments management`);
+	showError(`The container with id ${id} marked as amended cannot embed the other container of amendment ${embedded}, see https://github.com/w3c/webrtc-pc/blob/main/amendments.md for amendments management`, PLUGIN_NAME, {elements: [container]});
       }
     }
-    // validate that a section has only one difftype, one amendment type, one amendemnt status
+    // validate that a section has only one difftype, one amendment type, one amendment status
     if (amendments[id].some(a => a.difftype && a.difftype !== amendments[id][0].difftype)) {
-      throw new Error(`Amendments in container with id ${id} are mixing "modification" and "append" difftypes, see https://github.com/w3c/webrtc-pc/blob/main/amendments.md for amendments management`);
+      showError(`Amendments in container with id ${id} are mixing "modification" and "append" difftypes, see https://github.com/w3c/webrtc-pc/blob/main/amendments.md for amendments management`, PLUGIN_NAME, {elements: [container]});
     }
     if (amendments[id].some(a => a.type !== amendments[id][0].type)) {
       //throw new Error(`Amendments in container with id ${id} are mixing "corrections" and "addition" types`);
     }
     if (amendments[id].some(a => a.status !== amendments[id][0].status)) {
-      throw new Error(`Amendments in container with id ${id} are mixing "candidate" and "proposed" amendments, see https://github.com/w3c/webrtc-pc/blob/main/amendments.md for amendments management`);
+      showError(`Amendments in container with id ${id} are mixing "candidate" and "proposed" amendments, see https://github.com/w3c/webrtc-pc/blob/main/amendments.md for amendments management`, PLUGIN_NAME, {elements: [container]});
     }
 
     // Group by candidate id for listing in the appendix
@@ -131,7 +151,7 @@ async function listAmendments() {
         link.href = "#" + section;
         link.textContent = `section ${titleFromId(section)}`;
         entryLi.appendChild(link);
-	entryLi.appendChild(listPRs(pr));
+	entryLi.appendChild(listPRs(pr, config.github.repoURL));
 	entryLi.appendChild(listTestUpdates(testUpdates));
 	entriesUl.appendChild(entryLi);
       });
@@ -142,7 +162,12 @@ async function listAmendments() {
   }
 }
 
-function showAmendments() {
+const makeIdlDiffable = pre => {
+  pre.querySelector(".idlHeader").remove();
+  pre.textContent = pre.textContent ;
+};
+
+async function showAmendments(config, _, {showError}) {
   for (let section of Object.keys(amendments)) {
     const target = document.getElementById(section);
     let wrapper = document.createElement("div");
@@ -162,7 +187,7 @@ function showAmendments() {
       // integrate the annotations for candidate/proposed amendments
       // only when Status = REC
       // (but keep them all in for other statuses of changes)
-      if (respecConfig.specStatus !== "REC" && (["correction", "addition"].includes(type) || ["candidate", "proposed"].includes(status))) {
+      if (config.specStatus !== "REC" && (["correction", "addition"].includes(type) || ["candidate", "proposed"].includes(status))) {
 	continue;
       }
       const amendmentDiv = document.createElement("div");
@@ -174,7 +199,7 @@ function showAmendments() {
       title.innerHTML = description;
       amendmentDiv.appendChild(marker);
       amendmentDiv.appendChild(title);
-      amendmentDiv.appendChild(listPRs(pr));
+      amendmentDiv.appendChild(listPRs(pr, config.github.repoURL));
       annotations.push(amendmentDiv);
     }
 
@@ -185,45 +210,48 @@ function showAmendments() {
       const amendmentTitle = `${capitalize(amendments[section][0].status)} ${capitalize(amendments[section][0].type)}${amendments[section].length > 1 ? "s" : ""} ${amendments[section].map(a => `${a.id}`).join(', ')}`;
       const ui = document.createElement("fieldset");
       ui.className = "diff-ui";
-      ui.innerHTML = `<label><input aria-controls="${section} ${section}-new" name="change-${section}" class=both checked type=radio> Show Current and Future</label><label><input name="change-${section}" class=current type=radio> Show Current</label><label><input name="change-${section}" class=future type=radio>Show Future</label>`;
+      ui.innerHTML = `<label><input aria-controls="${section}" name="change-${section}" class=both checked type=radio> Show Current and Future</label><label><input name="change-${section}" class=current type=radio> Show Current</label><label><input name="change-${section}" class=future type=radio>Show Future</label>`;
       wrapper.appendChild(ui);
       if (amendments[section][0].difftype === "modify" || !amendments[section][0].difftype) {
 	ui.querySelectorAll('input[type="radio"]').forEach(inp => {
-	  inp.setAttribute("aria-controls", `${section} ${section}-new`);
+	  inp.setAttribute("aria-controls", `${section}`);
 	});
 	ui.classList.add("modify");
-	let containerOld = containerFromId(section);
-	containerOld = containerOld.cloneNode(true);
-	containerOld.classList.add("diff-old", "exclude");
-	containerOld.setAttribute("aria-label", `Deletion from ${amendmentTitle}`);
-	// clean up ids to avoid duplicates, but not for headings since they're required by pubrules
-	containerOld.querySelectorAll("*:not(:is(h2,h3,h4,h5,h6))[id]").forEach(el => el.removeAttribute("id"));
-	const containerNew = document.getElementById(section);
-	if (!containerNew) throw new Error(`No element with id ${section} in editors draft, see https://github.com/w3c/webrtc-pc/blob/main/amendments.md for amendments management`);
-
-	containerNew.classList.add("diff-new");
-	containerNew.id += "-new";
-	containerNew.setAttribute("aria-label", `Addition from ${amendmentTitle}`);
-	containerNew.parentNode.insertBefore(containerOld, containerNew);
-	containerNew.parentNode.insertBefore(wrapper, containerOld);
-	wrap(containerOld, document.createElement("del"));
-	wrap(containerNew, document.createElement("ins"));
+	const containerOld = baseRec.querySelector("#" + section);
+	if (!containerOld) {
+	  showError(`Unknown element with id ${section} in Recommendation used as basis, see https://github.com/w3c/webrtc-pc/blob/main/amendments.md for amendments management`, PLUGIN_NAME);
+	  continue;
+	}
+	const containerNew = document.getElementById(section)?.cloneNode(true);
+	if (!containerNew) {
+	  showError(`No element with id ${section} in editors draft, see https://github.com/w3c/webrtc-pc/blob/main/amendments.md for amendments management`, PLUGIN_NAME);
+	  continue;
+	}
+	removeComments(containerNew);
+	containerNew.querySelectorAll(".removeOnSave").forEach(el => el.remove());
+	const container = document.getElementById(section);
+	container.innerHTML = "";
+	// Use text-only content for pre - syntax highlights
+	// messes it up otherwise
+	if (containerNew.matches("pre.idl")) makeIdlDiffable(containerNew);
+	containerNew.querySelectorAll("pre.idl").forEach(makeIdlDiffable);
+	if (containerOld.matches("pre.idl")) makeIdlDiffable(containerOld);
+	containerOld.querySelectorAll("pre.idl").forEach(makeIdlDiffable);
+	await differ.diff(container, containerOld, containerNew);
+	container.parentNode.insertBefore(wrapper, container);
       } else if (amendments[section][0].difftype === "append") {
 	ui.classList.add("append");
-	const appendBase = document.getElementById(section);
-	appendBase.appendChild(wrapper);
-	const controlledIds = [];
-	document.querySelectorAll(`.add-to-${section}`).forEach((el,i) => {
-	  el.setAttribute("aria-label", `Addition from ${amendmentTitle}`);
-	  el.classList.add('diff-new');
-	  el.id = `${section}-new-${i}`;
-	  controlledIds.push(el.id);
-	  wrap(el, document.createElement("ins"));
-	});
+	const appendedEl = document.getElementById(section);
+	if (!appendedEl) {
+	  showError(`No element with id ${section} in editors draft, see https://github.com/w3c/webrtc-pc/blob/main/amendments.md for amendments management`, PLUGIN_NAME);
+	  continue;
+	}
+	appendedEl.setAttribute("aria-label", `Addition from ${amendmentTitle}`);
+	appendedEl.classList.add('diff-new');
+	markInsertion(appendedEl, wrapper);
 	ui.querySelectorAll('input[type="radio"]').forEach(inp => {
-	  inp.setAttribute("aria-controls", `${section} ${controlledIds.join(" ")}`);
+	  inp.setAttribute("aria-controls", `${section}`);
 	});
-
       }
     }
   }
diff --git a/amendments.json b/amendments.json
index a9e2017a1..f9940b354 100644
--- a/amendments.json
+++ b/amendments.json
@@ -61,7 +61,7 @@
       "id": 33
     }
   ],
-  "rtcicegatheringstate-description": [
+  "rtcicegatheringstate-transports": [
     {
       "description": "Update <code>RTCIceGatheringState</code> to clarify the relevant transport it represents",
       "pr": 2680,
@@ -100,7 +100,7 @@
       "id": 4
     }
   ],
-  "rtciceconnectionstate-description": [
+  "rtciceconnectionstate-transports": [
     {
       "description": "Update <code>RTCIceConnectionState</code> to clarify the relevant transport it represents",
       "pr": 2680,
@@ -113,7 +113,24 @@
       "id": 3
     }
   ],
-  "apply-description-restrictions": [
+  "apply-prohibited-gathering-1": [
+    {
+      "description": "Forbid ICE gathering and connectivity checks on administrative prohibited candidates",
+      "difftype": "append",
+      "pr": 2708,
+      "tests": [
+	"webrtc/RTCPeerConnection-addTcpIceCandidate.html"
+      ],
+      "testUpdates": [
+	"web-platform-tests/wpt#21025",
+	"web-platform-tests/wpt#45339"
+      ],
+      "type": "correction",
+      "status": "candidate",
+      "id": 5
+    }
+  ],
+  "apply-prohibited-gathering-2": [
     {
       "description": "Forbid ICE gathering and connectivity checks on administrative prohibited candidates",
       "difftype": "append",
@@ -270,9 +287,9 @@
       "id": 23
     }
   ],
-  "rtcpeerconnectioniceevent-url-desc": [
+  "rtcpeerconnectioniceevent-url-deprecation": [
     {
-      "description": "Add deprecation notice to RTCPeerConnectionIceEvent.url",
+      "description": "Mark RTCPeerConnectionIceEvent.url as deprecated",
       "pr": 2773,
       "testUpdates": "not-testable",
       "difftype": "append",
@@ -281,7 +298,7 @@
       "id": 23
     }
   ],
-  "rtcicecandidatetype-enum": [
+  "rtciceservertransportprotocol-enum": [
     {
       "description": "Add RTCIceCandidate.relayProtocol",
       "pr": 2763,
@@ -297,7 +314,7 @@
       "id": 16
     }
   ],
-  "usernameFragment-desc": [
+  "rtcicecandidate-relayprotocol": [
     {
       "description": "Add RTCIceCandidate.relayProtocol",
       "pr": 2763,
@@ -311,7 +328,9 @@
       "type": "addition",
       "status": "candidate",
       "id": 16
-    },
+    }
+  ],
+  "rtcicecandidate-url": [
     {
       "description": "Add RTCIceCandidate.url",
       "pr": 2773,
@@ -521,7 +540,7 @@
     {
       "description": "Redefine SendCodecs and ReceiveCodecs",
       "pr": 2935,
-      "type": "addition",
+      "type": "correction",
       "status": "candidate",
       "id": 41
     }
@@ -541,7 +560,7 @@
       "id": 19
     }
   ],
-  "set-last-stable-offer-properties": [
+  "rollback-ridless": [
     {
       "description": "Rollback restores ridless encoding trounced by sRD(simulcastOffer).",
       "tests": [
@@ -551,16 +570,18 @@
 	"web-platform-tests/wpt#37477"
       ],
       "pr": 2797,
-      "type": "addition",
+      "type": "correction",
+      "difftype": "append",
       "status": "candidate",
       "id": 13
     }
   ],
-  "set-rollback-per-transceiver": [
+  "rollback-ridless-2": [
     {
       "description": "Rollback restores ridless encoding trounced by sRD(simulcastOffer).",
       "pr": 2797,
-      "type": "addition",
+      "type": "correction",
+      "difftype": "append",
       "status": "candidate",
       "tests": [
 	"webrtc/simulcast/negotiation-encodings.https.html"
@@ -744,7 +765,7 @@
       "id": 32
     }
   ],
-  "dtmf-stopping": [
+  "no-dtmf-stopped-transceiver": [
     {
       "description": "Reject setParameters(), replaceTrack(), & insertDTMF() after stop()",
       "pr": 2829,
@@ -777,7 +798,7 @@
       "id": 34
     }
   ],
-  "connectionstate-algo": [
+  "connectionstate-closed": [
     {
       "description": "Don't fire connectionstatechange on pc.close()",
       "pr": 2876,
@@ -791,7 +812,7 @@
       "id": 35
     }
   ],
-  "rtcrtpheaderextensioncapability": [
+  "rtcsetparameteroptions-dictionary": [
     {
       "description": "Add empty setParameterOptions as second argument to setParameters for extensibility",
       "pr": 2885,
@@ -881,12 +902,12 @@
     {
       "description": "Redefine SendCodecs and ReceiveCodecs",
       "pr": 2935,
-      "type": "addition",
+      "type": "correction",
       "status": "candidate",
       "id": 41
     }
   ],
-  "rtcrtpreceiver-laststablestatereceivecodecs": [
+  "internalslot-jitterbuffertarget": [
     {
       "description": "Add control for the receiver's jitter buffer",
       "type": "addition",
@@ -921,7 +942,7 @@
       ]
     }
   ],
-  "rtcrtpreceiver-attributes-transport": [
+  "rtcrtpreceiver-jitterbuffertarget": [
     {
       "description": "Add control for the receiver's jitter buffer",
       "type": "addition",
@@ -965,7 +986,7 @@
       "id": 45
     }
   ],
-  "rtcrtpencodingparamters-attributes-active": [
+  "rtcrtpparameters-codec": [
     {
       "description": "Add codec to RTCRtpEncodingParameters",
       "type": "addition",
@@ -981,7 +1002,7 @@
       ]
     }
   ],
-  "stable-signaling-1": [
+  "init-rtcrtpencodingparameters-codec": [
     {
       "description": "Add codec to RTCRtpEncodingParameters",
       "type": "addition",
diff --git a/amendments.md b/amendments.md
index 47c50ca9a..7ddf49379 100644
--- a/amendments.md
+++ b/amendments.md
@@ -1,9 +1,9 @@
-* Identify the `id` of the element that wraps the amended content (or alternatively, add a container and/or an `id` to base-rec.html and the relevant block in the editors draft); an element with an `id` used to an existing amendment cannot contain another such container - when such a situation arises, use the top-most container `id`
+* Identify the `id` of the element that wraps the amended content (or alternatively, add a container and/or an `id` to base-rec.html and the relevant block in the editors draft); an element with an `id` used to wrap an existing amendment cannot contain another such container - when such a situation arises, use the top-most container `id`
   * to mark up a container as removed in the new version, keep the element in the editors draft with the container `id` set, and add the class `diff-rm` to make sure it doesn't show up
 * Add an array under that `id` as top level key in `amendments.json`, or complete the existing array if that `id` is already used
 * Add an an object to that array with keys:
   * `description`: an HTML description of what the change is,
-  * `difftype` (optional): defaults to "modify" (only the content of the block has changed); can also be "append" (in which case the added blocks in the editors draft should have the class `add-to-`*id*)
+  * `difftype` (optional): defaults to "modify" (only the content of the block has changed); can also be "append" (in which case the `id` identifies the newly added blocks in the editors draft)
   * `pr`: the number of the pull request where the amendment was merged (or an array thereof),
   * `tests` (optional): list of path to WPT test files that illustrate the change,
   * `testUpdates`: either "already-tested", "not-testable", or an array of references to WPT pull requests where the changes to WPT were added (of the form "web-platform-tests/wpt#NNN" where NNN is the number of the pull request)
diff --git a/base-rec.html b/base-rec.html
index ce7d47e95..dcae1e086 100644
--- a/base-rec.html
+++ b/base-rec.html
@@ -1576,7 +1576,7 @@ <h4 id="x4-3-2-rtcicegatheringstate-enum"><bdi class="secno">4.3.2 </bdi>
                 </tr>
               </tbody>
             </table>
-            <p>
+            <p id="rtcicegatheringstate-transports">
               The set of transports considered is the set of transports
               presently referenced by the PeerConnection's
               <a data-link-type="dfn" href="#transceivers-set" class="internalDFN" id="ref-for-transceivers-set-1">set of transceivers</a>.
@@ -1791,7 +1791,7 @@ <h4 id="x4-3-4-rtciceconnectionstate-enum"><bdi class="secno">4.3.4 </bdi>
                 </tr>
               </tbody>
             </table>
-          <p>
+          <p id="rtciceconnectionstate-transports">
             The set of transports considered is the set of transports
             presently referenced by the PeerConnection's
             <a data-link-type="dfn" href="#transceivers-set" class="internalDFN" id="ref-for-transceivers-set-3">set of transceivers</a>.
@@ -8362,8 +8362,8 @@ <h4 id="methods-5">
                       <a data-link-type="idl" data-type="exception" href="https://heycam.github.io/webidl/#invalidstateerror"><code>InvalidStateError</code></a>.
                     </p>
                   </li>
-                  <li>Validate <var>sendEncodings</var> by running the
-                  following steps:
+                  <li><p>Validate <var>sendEncodings</var> by running the
+                  following steps:</p>
                     <ol id="addtransceiver-sendencodings-validation">
                       <li data-tests="RTCPeerConnection-addTransceiver.https.html" class="has-tests">
                         <p>
diff --git a/diff.js b/diff.js
index b12273d68..6d9bca325 100644
--- a/diff.js
+++ b/diff.js
@@ -6,13 +6,19 @@ document.addEventListener("DOMContentLoaded", () => {
 	// the radio input is of the form change-[id_of-section]
 	const id = ui.querySelector("input").name.slice("change-".length);
 	if (ui.classList.contains("modify")) {
-	  ui.addEventListener("change", e => {
-	    document.getElementById(id).hidden = (e.target.className === "future");
-	    document.getElementById(id + "-new").hidden = (e.target.className === "current");
+	    ui.addEventListener("change", e => {
+	      document.getElementById(id).querySelectorAll('del').forEach(el => el.hidden = (e.target.className === "future"));
+	      document.getElementById(id).querySelectorAll('ins').forEach(el => el.hidden = (e.target.className === "current"));
 	  });
 	} else if (ui.classList.contains("append")) {
 	  ui.addEventListener("change", ev => {
-	    document.querySelectorAll(`.add-to-${id}`).forEach(el => el.hidden = (ev.target.className === "current"));
+	    const el = document.getElementById(id);
+	    const hiddenState = ev.target.className === "current";
+	    if (el.querySelector(".diff-ui")) {
+	      el.querySelector("ins").hidden = hiddenState;
+	    } else {
+	      el.hidden = hiddenState;
+	    }
 	  });
 	}
       });
diff --git a/js/diff/LICENSE-MPL b/js/diff/LICENSE-MPL
new file mode 100644
index 000000000..a612ad981
--- /dev/null
+++ b/js/diff/LICENSE-MPL
@@ -0,0 +1,373 @@
+Mozilla Public License Version 2.0
+==================================
+
+1. Definitions
+--------------
+
+1.1. "Contributor"
+    means each individual or legal entity that creates, contributes to
+    the creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+    means the combination of the Contributions of others (if any) used
+    by a Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+    means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+    means Source Code Form to which the initial Contributor has attached
+    the notice in Exhibit A, the Executable Form of such Source Code
+    Form, and Modifications of such Source Code Form, in each case
+    including portions thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+    means
+
+    (a) that the initial Contributor has attached the notice described
+        in Exhibit B to the Covered Software; or
+
+    (b) that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the
+        terms of a Secondary License.
+
+1.6. "Executable Form"
+    means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+    means a work that combines Covered Software with other material, in
+    a separate file or files, that is not Covered Software.
+
+1.8. "License"
+    means this document.
+
+1.9. "Licensable"
+    means having the right to grant, to the maximum extent possible,
+    whether at the time of the initial grant or subsequently, any and
+    all of the rights conveyed by this License.
+
+1.10. "Modifications"
+    means any of the following:
+
+    (a) any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered
+        Software; or
+
+    (b) any new file in Source Code Form that contains any Covered
+        Software.
+
+1.11. "Patent Claims" of a Contributor
+    means any patent claim(s), including without limitation, method,
+    process, and apparatus claims, in any patent Licensable by such
+    Contributor that would be infringed, but for the grant of the
+    License, by the making, using, selling, offering for sale, having
+    made, import, or transfer of either its Contributions or its
+    Contributor Version.
+
+1.12. "Secondary License"
+    means either the GNU General Public License, Version 2.0, the GNU
+    Lesser General Public License, Version 2.1, the GNU Affero General
+    Public License, Version 3.0, or any later versions of those
+    licenses.
+
+1.13. "Source Code Form"
+    means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+    means an individual or a legal entity exercising rights under this
+    License. For legal entities, "You" includes any entity that
+    controls, is controlled by, or is under common control with You. For
+    purposes of this definition, "control" means (a) the power, direct
+    or indirect, to cause the direction or management of such entity,
+    whether by contract or otherwise, or (b) ownership of more than
+    fifty percent (50%) of the outstanding shares or beneficial
+    ownership of such entity.
+
+2. License Grants and Conditions
+--------------------------------
+
+2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+(a) under intellectual property rights (other than patent or trademark)
+    Licensable by such Contributor to use, reproduce, make available,
+    modify, display, perform, distribute, and otherwise exploit its
+    Contributions, either on an unmodified basis, with Modifications, or
+    as part of a Larger Work; and
+
+(b) under Patent Claims of such Contributor to make, use, sell, offer
+    for sale, have made, import, and otherwise transfer either its
+    Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+(a) for any code that a Contributor has removed from Covered Software;
+    or
+
+(b) for infringements caused by: (i) Your and any other third party's
+    modifications of Covered Software, or (ii) the combination of its
+    Contributions with other software (except as part of its Contributor
+    Version); or
+
+(c) under Patent Claims infringed by Covered Software in the absence of
+    its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+3. Responsibilities
+-------------------
+
+3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+(a) such Covered Software must also be made available in Source Code
+    Form, as described in Section 3.1, and You must inform recipients of
+    the Executable Form how they can obtain a copy of such Source Code
+    Form by reasonable means in a timely manner, at a charge no more
+    than the cost of distribution to the recipient; and
+
+(b) You may distribute such Executable Form under the terms of this
+    License, or sublicense it under different terms, provided that the
+    license for the Executable Form does not attempt to limit or alter
+    the recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+---------------------------------------------------
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: (a) comply with
+the terms of this License to the maximum extent possible; and (b)
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+5. Termination
+--------------
+
+5.1. The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated (a) provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and (b) on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+************************************************************************
+*                                                                      *
+*  6. Disclaimer of Warranty                                           *
+*  -------------------------                                           *
+*                                                                      *
+*  Covered Software is provided under this License on an "as is"       *
+*  basis, without warranty of any kind, either expressed, implied, or  *
+*  statutory, including, without limitation, warranties that the       *
+*  Covered Software is free of defects, merchantable, fit for a        *
+*  particular purpose or non-infringing. The entire risk as to the     *
+*  quality and performance of the Covered Software is with You.        *
+*  Should any Covered Software prove defective in any respect, You     *
+*  (not any Contributor) assume the cost of any necessary servicing,   *
+*  repair, or correction. This disclaimer of warranty constitutes an   *
+*  essential part of this License. No use of any Covered Software is   *
+*  authorized under this License except under this disclaimer.         *
+*                                                                      *
+************************************************************************
+
+************************************************************************
+*                                                                      *
+*  7. Limitation of Liability                                          *
+*  --------------------------                                          *
+*                                                                      *
+*  Under no circumstances and under no legal theory, whether tort      *
+*  (including negligence), contract, or otherwise, shall any           *
+*  Contributor, or anyone who distributes Covered Software as          *
+*  permitted above, be liable to You for any direct, indirect,         *
+*  special, incidental, or consequential damages of any character      *
+*  including, without limitation, damages for lost profits, loss of    *
+*  goodwill, work stoppage, computer failure or malfunction, or any    *
+*  and all other commercial damages or losses, even if such party      *
+*  shall have been informed of the possibility of such damages. This   *
+*  limitation of liability shall not apply to liability for death or   *
+*  personal injury resulting from such party's negligence to the       *
+*  extent applicable law prohibits such limitation. Some               *
+*  jurisdictions do not allow the exclusion or limitation of           *
+*  incidental or consequential damages, so this exclusion and          *
+*  limitation may not apply to You.                                    *
+*                                                                      *
+************************************************************************
+
+8. Litigation
+-------------
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+9. Miscellaneous
+----------------
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+10. Versions of the License
+---------------------------
+
+10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+-------------------------------------------
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+---------------------------------------------------------
+
+  This Source Code Form is "Incompatible With Secondary Licenses", as
+  defined by the Mozilla Public License, v. 2.0.
diff --git a/js/diff/path-diff-worker.js b/js/diff/path-diff-worker.js
new file mode 100644
index 000000000..b37e951c8
--- /dev/null
+++ b/js/diff/path-diff-worker.js
@@ -0,0 +1,436 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+// copied from https://github.com/arai-a/ecma262-compare/blob/gh-pages/js/path-diff-worker.js
+
+"use strict";
+
+
+// Calculate diff between 2 HTML fragments, based on text+path based LCS.
+//
+// The HTML fragment shouldn't omit closing tag, if it's not empty tag.
+class HTMLPathDiffWorker {
+  static run({ type, s1, s2 }) {
+    if (type === "diff") {
+      return this.diff(s1, s2);
+    }
+    if (type === "splitForDiff") {
+      return this.splitForDiff(s1, s2);
+    }
+    return "";
+  }
+
+  // Calculate diff between 2 HTML fragments.
+  static diff(s1, s2) {
+    const seq1 = this.toSeq(s1);
+    const seq2 = this.toSeq(s2);
+
+    const C = this.LCS(seq1, seq2);
+    const diff = this.LCSToDiff(seq1, seq2, C);
+    const seq = this.diffToSeq(diff);
+
+    return this.fromSeq(seq);
+  }
+
+  // Convert a HTML fragment into a sequence of text or empty tag, with
+  // path information.
+  static toSeq(s) {
+    const seq = [];
+    const name_stack = [];
+    const sel_stack = [];
+    const tag_stack = [];
+    for (const t of this.tokenize(s)) {
+      switch (t.type) {
+        case "o": {
+          name_stack.push(t.name);
+          if (t.id) {
+            sel_stack.push(t.name + "#" + t.id);
+          } else {
+            sel_stack.push(t.name);
+          }
+          tag_stack.push(t.tag);
+          break;
+        }
+        case "c": {
+          name_stack.pop();
+          sel_stack.pop();
+          tag_stack.pop();
+          break;
+        }
+        case "t": {
+          const text = t.text;
+          const path = sel_stack.join("/");
+
+          seq.push({
+            name_stack: name_stack.slice(),
+            path,
+            sel_stack: sel_stack.slice(),
+            tag_stack: tag_stack.slice(),
+            text,
+          });
+        }
+      }
+    }
+    return seq;
+  }
+
+  // Tokenize HTML fragment into text, empty tag, opening tag, and closing tag.
+  static *tokenize(s) {
+    const emptyTags = new Set([
+      "area",
+      "base",
+      "br",
+      "col",
+      "embed",
+      "hr",
+      "img",
+      "input",
+      "link",
+      "meta",
+      "param",
+      "source",
+      "track",
+      "wbr",
+    ]);
+
+    let i = 0;
+    let start = 0;
+    let prev = "";
+    const len = s.length;
+
+    while (i < len) {
+      const c = s.charAt(i);
+      if (c === "<") {
+        if (start !== i) {
+          yield {
+            text: s.slice(start, i),
+            type: "t",
+          };
+        }
+
+        const re = /[^> \t\r\n]+/g;
+        re.lastIndex = i + 1;
+        const result = re.exec(s);
+
+        const to = s.indexOf(">", i + 1);
+
+        const name = result[0];
+        const tag = s.slice(i, to + 1);
+
+        if (name.startsWith("/")) {
+          // If the current element has no content,
+          // Put empty text, so that `toSeq` creates empty text inside
+          // this element..
+          //
+          // Otherwise `toSeq` won't create any info about this element.
+          if (prev === "o") {
+            yield {
+              text: "",
+              type: "t",
+            };
+          }
+
+          yield {
+            name,
+            tag,
+            type: "c",
+          };
+          prev = "c";
+        } else if (emptyTags.has(name)) {
+          // Empty tag is treated as text.
+          yield {
+            text: tag,
+            type: "t",
+          };
+          prev = "t";
+        } else {
+          // If there's opening tag immediately after closing tag,
+          // put empty text, so that `toSeq` creates empty text at
+          // parent node, between 2 elements
+          // (one closed here, and one opened here).
+          //
+          // Otherwise `toSeq` will concatenate 2 elements if they're same.
+          if (prev === "c") {
+            yield {
+              text: "",
+              type: "t",
+            };
+          }
+
+          let id = undefined;
+          const m = tag.match(` id="([^"]+)"`);
+          if (m) {
+            id = m[1];
+          }
+
+          yield {
+            id,
+            name,
+            tag,
+            type: "o",
+          };
+          prev = "o";
+        }
+        i = to + 1;
+        start = i;
+      } else if (c.match(/[ \t\r\n]/)) {
+        const re = /[ \t\r\n]+/g;
+        re.lastIndex = start;
+        const result = re.exec(s);
+        yield {
+          text: s.slice(start, i) + result[0],
+          type: "t",
+        };
+        prev = "t";
+        i += result[0].length;
+        start = i;
+      } else {
+        i++;
+      }
+    }
+
+    if (start < len) {
+      yield {
+        text: s.slice(start),
+        type: "t",
+      };
+    }
+  }
+
+  // Calculate the matrix for Longest Common Subsequence of 2 sequences.
+  static LCS(seq1, seq2) {
+    const len1 = seq1.length;
+    const len2 = seq2.length;
+    const C = new Array(len1 + 1);
+    for (let i = 0; i < len1 + 1; i++) {
+      C[i] = new Array(len2 + 1);
+    }
+    for (let i = 0; i < len1 + 1; i++) {
+      C[i][0] = 0;
+    }
+    for (let j = 0; j < len2 + 1; j++) {
+      C[0][j] = 0;
+    }
+
+    function isDiff(s1, s2) {
+      // Do not count the difference in attributes,h.
+      return s1.text !== s2.text || s1.path !== s2.path;
+    }
+
+    for (let i = 1; i < len1 + 1; i++) {
+      for (let j = 1; j < len2 + 1; j++) {
+        if (!isDiff(seq1[i - 1], seq2[j - 1])) {
+          C[i][j] = C[i-1][j-1] + 1;
+        } else {
+          C[i][j] = Math.max(C[i][j-1], C[i-1][j]);
+        }
+      }
+    }
+
+    return C;
+  }
+
+  // Convert 2 sequences and the LCS matrix into a sequence of diff.
+  static LCSToDiff(seq1, seq2, C) {
+    const len1 = seq1.length;
+    const len2 = seq2.length;
+    const diff = [];
+
+    for (let i = len1, j = len2; i > 0 || j > 0;) {
+      if ((i > 0 && j > 0 && C[i][j] === C[i - 1][j - 1]) ||
+          (j > 0 && C[i][j] === C[i][j - 1])) {
+        diff.push({
+          item: seq2[j - 1],
+          op: "+",
+        });
+        j--;
+      } else if (i > 0 && C[i][j] === C[i - 1][j]) {
+        diff.push({
+          item: seq1[i - 1],
+          op: "-",
+        });
+        i--;
+      } else {
+        diff.push({
+          item: seq1[i - 1],
+          item2: seq2[j - 1],
+          op: " ",
+        });
+        i--;
+        j--;
+      }
+    }
+
+    diff.reverse();
+
+    return diff;
+  }
+
+  // Convert a sequence of diff into a sequence of text or empty tag, with
+  // path information.
+  static diffToSeq(diff) {
+    const seq = [];
+
+    const INS_NAME = `ins`;
+    const INS_TAG = `<ins class="htmldiff-ins htmldiff-change">`;
+    const DEL_NAME = `del`;
+    const DEL_TAG = `<del class="htmldiff-del htmldiff-change">`;
+
+    for (const d of diff) {
+      switch (d.op) {
+        case " ": {
+          seq.push(d.item);
+          break;
+        }
+        case "+":
+        case "-": {
+          const new_name_stack = d.item.name_stack.slice();
+          const new_sel_stack = d.item.sel_stack.slice();
+          const new_tag_stack = d.item.tag_stack.slice();
+
+          // FIXME: Instead of the leaf, put ins/del somewhere in the stack.
+          //        https://github.com/arai-a/ecma262-compare/issues/13
+          switch (d.op) {
+            case "+": {
+              new_name_stack.push(INS_NAME);
+              new_sel_stack.push(INS_NAME);
+              new_tag_stack.push(INS_TAG);
+              break;
+            }
+            case "-": {
+              new_name_stack.push(DEL_NAME);
+              new_sel_stack.push(DEL_NAME);
+              new_tag_stack.push(DEL_TAG);
+              break;
+            }
+          }
+
+          seq.push({
+            name_stack: new_name_stack,
+            path: new_sel_stack.join("/"),
+            sel_stack: new_sel_stack,
+            tag_stack: new_tag_stack,
+            text: d.item.text,
+          });
+          break;
+        }
+      }
+    }
+
+    return seq;
+  }
+
+  // Convert a sequence of text or empty tag, with path information into
+  // HTML fragment.
+  static fromSeq(seq) {
+    const name_stack = [];
+    const sel_stack = [];
+    const tag_stack = [];
+
+    const ts = [];
+
+    for (const s of seq) {
+      let i = 0;
+      // Skip common ancestor.
+      for (; i < s.sel_stack.length; i++) {
+        if (s.sel_stack[i] !== sel_stack[i]) {
+          break;
+        }
+      }
+
+      // Close tags that are not part of current text.
+      while (i < name_stack.length) {
+        sel_stack.pop();
+        tag_stack.pop();
+        const name = name_stack.pop();
+        ts.push(`</${name}>`);
+      }
+
+      // Open remaining tags that are ancestor of current text.
+      for (; i < s.name_stack.length; i++) {
+        name_stack.push(s.name_stack[i]);
+        sel_stack.push(s.sel_stack[i]);
+        const tag = s.tag_stack[i];
+        tag_stack.push(tag);
+        ts.push(tag);
+      }
+
+      ts.push(s.text);
+    }
+
+    return ts.join("");
+  }
+
+  static splitForDiff(s1, s2) {
+    const seq1 = this.toSeq(s1);
+    const seq2 = this.toSeq(s2);
+
+    const C = this.LCS(seq1, seq2);
+    const diff = this.LCSToDiff(seq1, seq2, C);
+
+    const [splitSeq1, splitSeq2] = this.split(diff);
+    return [this.fromSeq(splitSeq1), this.fromSeq(splitSeq2)];
+  }
+
+  static split(diff) {
+    let prevStackDepth1 = 0;
+    let prevStackDepth2 = 0;
+
+    const splitSeq1 = [];
+    const splitSeq2 = [];
+    for (const d of diff) {
+      switch (d.op) {
+        case " ": {
+          splitSeq1.push(d.item);
+          prevStackDepth1 = d.item.path.length;
+
+          splitSeq2.push(d.item2);
+          prevStackDepth2 = d.item.path.length;
+          break;
+        }
+        case "-": {
+          splitSeq1.push(d.item);
+          prevStackDepth1 = d.item.path.length;
+
+          if (prevStackDepth2 > d.item.path.length) {
+            splitSeq2.push({
+              name_stack: d.item.name_stack,
+              path: d.item.path,
+              sel_stack: d.item.sel_stack,
+              tag_stack: d.item.tag_stack,
+              text: "",
+            });
+            prevStackDepth2 = d.item.path.length;
+          }
+          break;
+        }
+        case "+": {
+          if (prevStackDepth1 > d.item.path.length) {
+            splitSeq1.push({
+              name_stack: d.item.name_stack,
+              path: d.item.path,
+              sel_stack: d.item.sel_stack,
+              tag_stack: d.item.tag_stack,
+              text: "",
+            });
+            prevStackDepth1 = d.item.path.length;
+          }
+          splitSeq2.push(d.item);
+          prevStackDepth2 = d.item.path.length;
+          break;
+        }
+      }
+    }
+
+    return [splitSeq1, splitSeq2];
+  }
+}
+
+onmessage = msg => {
+  const id = msg.data.id;
+  const data = HTMLPathDiffWorker.run(msg.data.data);
+  postMessage({
+    data,
+    id,
+  });
+};
diff --git a/js/diff/specdiff.js b/js/diff/specdiff.js
new file mode 100644
index 000000000..d75bdb30b
--- /dev/null
+++ b/js/diff/specdiff.js
@@ -0,0 +1,406 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+// Adapted from https://github.com/arai-a/ecma262-compare/blob/gh-pages/js/compare.js
+
+"use strict";
+
+
+/* global DateUtils, Base */
+
+class PromiseWorker {
+  constructor(path) {
+    this.nextId = 0;
+    this.resolveMap = {};
+    this.worker = new Worker(path);
+    this.worker.onmessage = msg => {
+      const id = msg.data.id;
+      const resolve = this.resolveMap[id];
+      delete this.resolveMap[id];
+      resolve(msg.data.data);
+    };
+  }
+
+  async run(data) {
+    const id = this.nextId;
+    this.nextId++;
+    if (this.nextId > 1000000) {
+      this.nextId = 0;
+    }
+
+    return new Promise(resolve => {
+      this.resolveMap[id] = resolve;
+
+      this.worker.postMessage({
+        data,
+        id,
+      });
+    });
+  }
+}
+
+const HTMLPathDiffWorker = new PromiseWorker("./js/diff/path-diff-worker.js");
+const HTMLTreeDiffWorker = new PromiseWorker("./js/diff/tree-diff-worker.js");
+
+class HTMLPathDiff {
+  static diff(s1, s2) {
+    return HTMLPathDiffWorker.run({
+      s1,
+      s2,
+      type: "diff",
+    });
+  }
+
+  static splitForDiff(s1, s2) {
+    return HTMLPathDiffWorker.run({
+      s1,
+      s2,
+      type: "splitForDiff",
+    });
+  }
+}
+
+// Calculate diff between 2 DOM tree.
+class HTMLTreeDiff {
+  constructor() {
+    this.blockNodes = new Set(
+      [
+        "div", "p", "pre", "section",
+        "figcaption", "figure",
+        "h1", "h2",
+        "ol", "ul", "li",
+        "dl", "dt", "dd",
+        "table", "thead", "tbody", "tfoot", "tr", "th", "td"
+      ]
+    );
+    const unwrappableTags = [
+	"figcaption",
+	"li", "dt", "dd",
+	"thead", "caption", "tbody", "tfoot", "tr", "th", "td"
+    ];
+    this.invalidSelector = unwrappableTags.map(el => `ins > ${el}, del > ${el}`).join(", ");
+
+  }
+
+  // Calculate diff between 2 DOM tree.
+  async diff(diffNode, node1, node2) {
+    this.addNumbering("1-", node1);
+    this.addNumbering("2-", node2);
+
+    await this.splitForDiff(node1, node2);
+
+    this.combineNodes(node1, "li");
+    this.combineNodes(node2, "li");
+
+    const nodeObj1 = this.DOMTreeToPlainObject(node1);
+    const nodeObj2 = this.DOMTreeToPlainObject(node2);
+
+    const diffNodeObj = await HTMLTreeDiffWorker.run({
+      nodeObj1,
+      nodeObj2,
+    });
+
+    const tmp = this.plainObjectToDOMTree(diffNodeObj);
+    for (const child of [...tmp.childNodes]) {
+      diffNode.appendChild(child);
+    }
+
+    this.combineNodes(diffNode, "*");
+
+    this.swapInsDel(diffNode);
+
+    this.removeNumbering(diffNode);
+
+    this.cleanMarkup(diffNode);
+  }
+
+  // Convert DOM tree to object tree.
+  DOMTreeToPlainObject(node) {
+    const result = this.DOMElementToPlainObject(node);
+
+    result.textContent = node.textContent;
+
+    if (node.childNodes.length === 1 && node.childNodes[0].nodeType === Node.ELEMENT_NODE) {
+      const childObj = this.DOMTreeToPlainObject(node.childNodes[0]);
+      result.wrappingChild = childObj;
+      result.childNodes = [...childObj.childNodes];
+      result.wrappingChild.childNodes = [];
+      result.textLength = childObj.textLength;
+      return result;
+    }
+
+    for (const child of node.childNodes) {
+      if (child.nodeType === Node.TEXT_NODE) {
+        if (this.isUnnecessaryText(child)) {
+          continue;
+        }
+
+        result.textLength += this.compressSpaces(child.textContent).length;
+        this.splitTextInto(result.childNodes, child.textContent);
+        continue;
+      }
+
+      if (child.nodeType === Node.ELEMENT_NODE) {
+        const childObj = this.DOMTreeToPlainObject(child);
+        result.childNodes.push(childObj);
+        result.textLength += childObj.textLength;
+      }
+    }
+
+    return result;
+  }
+
+  compressSpaces(s) {
+    return s.replace(/\s+/, " ");
+  }
+
+  // Remove unnecessary whitespace texts that can confuse diff algorithm.
+  //
+  // Diff algorithm used here isn't good at finding diff in repeating
+  // structure, such as list element, separated by same whitespaces.
+  //
+  // Remove such whitespaces between each `li`, to reduce the confusion.
+  isUnnecessaryText(node) {
+    if (!/^[ \r\n\t]*$/.test(node.textContent)) {
+      return false;
+    }
+
+    if (node.previousSibling) {
+      if (node.previousSibling.nodeType === Node.COMMENT_NODE ||
+          this.isBlock(node.previousSibling)) {
+        return true;
+      }
+    }
+    if (node.nextSibling) {
+      if (node.nextSibling.nodeType === Node.COMMENT_NODE ||
+          this.isBlock(node.nextSibling)) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+
+  isBlock(node) {
+    const name = node.nodeName.toLowerCase();
+    return this.blockNodes.has(name);
+  }
+
+  // Convert single DOM element to object, without child nodes.
+  DOMElementToPlainObject(node) {
+    node.normalize();
+    const attributes = {};
+    if (node.attributes) {
+      for (const attr of node.attributes) {
+        attributes[attr.name] = attr.value;
+      }
+    }
+
+    return this.createPlainObject(
+      node.nodeName.toLowerCase(), node.id, attributes);
+  }
+
+  // Create a plain object representation for an empty DOM element.
+  createPlainObject(name, id = undefined, attributes = {}) {
+    return {
+      attributes,
+      childNodes: [],
+      id,
+      name,
+      textLength: 0,
+    };
+  }
+
+  // Split text by whitespaces and punctuation, given that
+  // diff is performed on the tree of nodes, and text is the
+  // minimum unit.
+  //
+  // Whitespaces are appended to texts before it, instead of creating Text
+  // node with whitespace alone.
+  // This is necessary to avoid matching each whitespace in different sentence.
+  splitTextInto(childNodes, text) {
+    while (true) {
+      const spaceIndex = text.search(/\s[^\s]/);
+      const punctIndex = text.search(/[.,:;?!()[\]]/);
+      if (spaceIndex === -1 && punctIndex === -1) {
+        break;
+      }
+
+      if (punctIndex !== -1 && (spaceIndex === -1 || punctIndex < spaceIndex)) {
+        if (punctIndex > 0) {
+          childNodes.push(text.slice(0, punctIndex));
+        }
+        childNodes.push(text.slice(punctIndex, punctIndex + 1));
+        text = text.slice(punctIndex + 1);
+      } else {
+        childNodes.push(text.slice(0, spaceIndex + 1));
+        text = text.slice(spaceIndex + 1);
+      }
+    }
+    if (text) {
+      childNodes.push(text);
+    }
+  }
+
+  // Add unique ID ("tree-diff-num" attribute) to each element.
+  //
+  // See `splitForDiff` for more details.
+  addNumbering(prefix, node) {
+    let i = 0;
+    for (const child of node.getElementsByTagName("*")) {
+      child.setAttribute("tree-diff-num", prefix + i);
+      i++;
+    }
+  }
+
+  // Split both DOM tree, using text+path based LCS, to have similar tree
+  // structure.
+  //
+  // This is a workaround for the issue that raw tree LCS cannot handle
+  // split/merge.
+  //
+  // To solve the issue, split both tree by `splitForDiff` to make each text
+  // match even if parent tree gets split/merged.
+  //
+  // This caused another issue when `splitForDiff` split more than necessary
+  // (like, adding extra list element).
+  //
+  // Such nodes are combined in `combineNodes`, based on the unique ID
+  // added by `addNumbering`, and those IDs are removed in `removeNumbering`.
+  //
+  // Also, `LCSToDiff` always places `ins` after `del`, but `combineNodes` can
+  // merge 2 nodes where first one ends with `ins` and the second one starts
+  // with `del`. `swapInsDel` fixes up the order.
+  async splitForDiff(node1, node2) {
+    const [html1, html2] = await HTMLPathDiff.splitForDiff(
+      node1.innerHTML, node2.innerHTML);
+    node1.innerHTML = html1;
+    node2.innerHTML = html2;
+  }
+
+  // Convert object tree to DOM tree.
+  plainObjectToDOMTree(nodeObj) {
+    if (typeof nodeObj === "string") {
+      return document.createTextNode(nodeObj);
+    }
+
+    const result = document.createElement(nodeObj.name);
+    for (const [key, value] of Object.entries(nodeObj.attributes)) {
+      result.setAttribute(key, value);
+    }
+    let parent = result;
+    if (nodeObj.wrappingChild) {
+      const wrappingChild = this.plainObjectToDOMTree(nodeObj.wrappingChild);
+      parent = wrappingChild;
+      result.appendChild(wrappingChild);
+    }
+    for (const child of nodeObj.childNodes) {
+      parent.appendChild(this.plainObjectToDOMTree(child));
+    }
+
+    return result;
+  }
+
+  // Combine adjacent nodes with same ID ("tree-diff-num" attribute) into one
+  //
+  // See `splitForDiff` for more details.
+  combineNodes(node, name) {
+    const removedNodes = new Set();
+
+    for (const child of [...node.getElementsByTagName(name)]) {
+      if (removedNodes.has(child)) {
+        continue;
+      }
+
+      if (!child.hasAttribute("tree-diff-num")) {
+        continue;
+      }
+
+      const num = child.getAttribute("tree-diff-num");
+      while (true) {
+        if (!child.nextSibling) {
+          break;
+        }
+
+        if (!(child.nextSibling instanceof Element)) {
+          break;
+        }
+
+        const next = child.nextSibling;
+        if (next.getAttribute("tree-diff-num") !== num) {
+          break;
+        }
+
+        while (next.firstChild) {
+          child.appendChild(next.firstChild);
+        }
+
+        removedNodes.add(next);
+        next.remove();
+      }
+    }
+  }
+
+  // Swap `ins`+`del` to `del`+`ins`.
+  //
+  // See `splitForDiff` for more details.
+  swapInsDel(node) {
+    for (const child of [...node.getElementsByClassName("htmldiff-ins")]) {
+      if (!child.nextSibling) {
+        continue;
+      }
+
+      if (!(child.nextSibling instanceof Element)) {
+        continue;
+      }
+
+      if (child.nextSibling.classList.contains("htmldiff-del")) {
+        child.before(child.nextSibling);
+      }
+    }
+  }
+
+  // Add "tree-diff-num" attribute from all elements.
+  //
+  // See `splitForDiff` for more details.
+  removeNumbering(node) {
+    for (const child of node.getElementsByTagName("*")) {
+      child.removeAttribute("tree-diff-num");
+    }
+  }
+
+  cleanMarkup(node) {
+    let invalid;
+
+    // Remove empty pre elements
+    // (not sure why they're added in the first place)
+    document.querySelectorAll("pre").forEach(el => {
+      if (!el.textContent.trim()) {
+	el.remove();
+      }
+    });
+
+    while ((invalid = node.querySelector(this.invalidSelector))) {
+      const diffNode = invalid.parentNode;
+      for (const child of [...diffNode.children]) {
+	const insideDiffNode = diffNode.cloneNode();
+	insideDiffNode.append(...child.childNodes);
+	child.append(insideDiffNode);
+	diffNode.insertAdjacentElement("beforebegin", child);
+      }
+      diffNode.remove();
+    }
+
+    // Put caption elements before thead
+    while((invalid = node.querySelector("thead:has( + caption)"))) {
+      invalid.insertAdjacentElement("beforebegin", invalid.nextElementSibling);
+    }
+
+    // Merge successive thead or tfoot
+    while((invalid = node.querySelector("thead:has( + thead), tfoot:has( + tfoot)"))) {
+      invalid.append(...invalid.nextElementSibling.children);
+      invalid.nextElementSibling.remove();
+    }
+
+  }
+}
diff --git a/js/diff/tree-diff-worker.js b/js/diff/tree-diff-worker.js
new file mode 100644
index 000000000..c1f4143a6
--- /dev/null
+++ b/js/diff/tree-diff-worker.js
@@ -0,0 +1,546 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+// Adapted from https://github.com/arai-a/ecma262-compare/blob/gh-pages/js/tree-diff-worker.js
+
+"use strict";
+
+
+// TODO: avoid bugging on meaningless markup wrappers?
+// e.g; headings, idl highlight
+
+function isIgnorableId(id) {
+  return id === "" || id.startsWith('ref-for-') || id.startsWith('h-note-') || id.match(/generatedID/) || id.match(/^webidl-[0-9]*$/);
+}
+
+class HTMLTreeDiffWorker {
+  constructor() {
+    this.LCSMapMap = new Map();
+    this.depth = 0;
+  }
+
+  run({ nodeObj1, nodeObj2 }) {
+    const diffNodeObj = this.createPlainObject("div");
+    this.LCS(nodeObj1, nodeObj2);
+    this.LCSToDiff(diffNodeObj, nodeObj1, nodeObj2);
+    return diffNodeObj;
+  }
+
+  // Calculates LCS for 2 nodes, stores it into `this.LCSMapMap`, and returns
+  // an object that represents how much they are different.
+  LCS(nodeObj1, nodeObj2) {
+    if (typeof nodeObj1 !== typeof nodeObj2) {
+      if (typeof nodeObj1 === "object") {
+        return {
+          del: nodeObj1.textLength,
+          ins: this.compressSpaces(nodeObj2).length,
+          same: 0,
+          state: "diff",
+          stateCount: 1,
+        };
+      }
+      return {
+        del: this.compressSpaces(nodeObj1).length,
+        ins: nodeObj2.textLength,
+        same: 0,
+        state: "diff",
+        stateCount: 1,
+      };
+    }
+
+    if (typeof nodeObj1 === "string") {
+      if (nodeObj1 !== nodeObj2) {
+        return {
+          del: this.compressSpaces(nodeObj1).length,
+          ins: this.compressSpaces(nodeObj2).length,
+          same: 0,
+          state: "diff",
+          stateCount: 1,
+        };
+      }
+      return {
+        del: 0,
+        ins: 0,
+        same: this.compressSpaces(nodeObj2).length,
+        state: "same",
+        stateCount: 1,
+      };
+    }
+
+    if (nodeObj1.name !== nodeObj2.name) {
+      return {
+        del: nodeObj1.textLength,
+        ins: nodeObj2.textLength,
+        same: 0,
+        state: "diff",
+        stateCount: 1,
+      };
+    }
+
+    if (nodeObj1.id !== nodeObj2.id  && nodeObj1.textContent !== nodeObj2.textContent) {
+      if (isIgnorableId(nodeObj2.id) || isIgnorableId(nodeObj1.id)) {
+	nodeObj2.id = "";
+	nodeObj1.id = "";
+      } else {
+	return {
+          del: nodeObj1.textLength,
+          ins: nodeObj2.textLength,
+          same: 0,
+          state: "diff",
+          stateCount: 1,
+	};
+      }
+    }
+
+    const len1 = nodeObj1.childNodes.length;
+    const len2 = nodeObj2.childNodes.length;
+
+    if (len1 === 0) {
+      if (len2 === 0) {
+        return {
+          del: 0,
+          ins: 0,
+          same: 1,
+          state: "same",
+          stateCount: 1,
+        };
+      }
+      return {
+        del: 1,
+        ins: 1,
+        same: 0,
+        state: "diff",
+        stateCount: 1,
+      };
+    }
+    if (len2 === 0) {
+      return {
+        del: 1,
+        ins: 1,
+        same: 0,
+        state: "diff",
+        stateCount: 1,
+      };
+    }
+
+    const C = new Array(len1 + 1);
+    for (let i = 0; i < len1 + 1; i++) {
+      C[i] = new Array(len2 + 1);
+    }
+    for (let i = 0; i < len1 + 1; i++) {
+      C[i][0] = 0;
+    }
+    for (let j = 0; j < len2 + 1; j++) {
+      C[0][j] = 0;
+    }
+
+    const R = new Array(len1 + 1);
+    for (let i = 0; i < len1 + 1; i++) {
+      R[i] = new Array(len2 + 1);
+    }
+    for (let i = 0; i < len1 + 1; i++) {
+      R[i][0] = {
+        del: 0,
+        ins: 0,
+        same: 0,
+        state: "same",
+        stateCount: 1,
+      };
+    }
+    for (let j = 0; j < len2 + 1; j++) {
+      R[0][j] = {
+        del: 0,
+        ins: 0,
+        same: 0,
+        state: "same",
+        stateCount: 1,
+      };
+    }
+
+    if (this.LCSMapMap.has(nodeObj1)) {
+      this.LCSMapMap.get(nodeObj1).set(nodeObj2, C);
+    } else {
+      const m = new Map();
+      m.set(nodeObj2, C);
+      this.LCSMapMap.set(nodeObj1, m);
+    }
+
+    for (let i = 1; i < len1 + 1; i++) {
+      for (let j = 1; j < len2 + 1; j++) {
+        const child1 = nodeObj1.childNodes[i - 1];
+        const child2 = nodeObj2.childNodes[j - 1];
+
+        this.depth++;
+        const result = this.LCS(child1, child2);
+        this.depth--;
+        const score = this.resultToScore(result);
+
+        const score11 = C[i-1][j-1] + score;
+        const score01 = C[i][j-1];
+        const score10 = C[i-1][j];
+
+        R[i][j] = result;
+
+        if (score11 >= score01 && score11 >= score10) {
+          C[i][j] = score11;
+        } else if (score01 > score10) {
+          C[i][j] = score01;
+        } else {
+          C[i][j] = score10;
+        }
+      }
+    }
+
+    let result = {
+      del: 0,
+      ins: 0,
+      same: 0,
+      state: "same",
+      stateCount: 1,
+    };
+
+    const ins = child2 => {
+      if (typeof child2 === "string") {
+        result = this.addResult(result, {
+          del: 0,
+          ins: this.compressSpaces(child2).length,
+          same: 0,
+          state: "diff",
+          stateCount: 1,
+        });
+      } else {
+        result = this.addResult(result, {
+          del: 0,
+          ins: child2.textLength,
+          same: 0,
+          state: "diff",
+          stateCount: 1,
+        });
+      }
+    };
+    const del = child1 => {
+      if (typeof child1 === "string") {
+        result = this.addResult(result, {
+          del: this.compressSpaces(child1).length,
+          ins: 0,
+          same: 0,
+          state: "diff",
+          stateCount: 1,
+        });
+      } else {
+        result = this.addResult(result, {
+          del: child1.textLength,
+          ins: 0,
+          same: 0,
+          state: "diff",
+          stateCount: 1,
+        });
+      }
+    };
+    const mod = r => {
+      result = this.addResult(result, r);
+    };
+    const keep = r => {
+      result = this.addResult(result, r);
+    };
+
+    for (let i = len1, j = len2; i > 0 || j > 0;) {
+      const child1 = nodeObj1.childNodes[i - 1];
+      const child2 = nodeObj2.childNodes[j - 1];
+
+      if ((i > 0 && j > 0 && C[i][j] === C[i - 1][j - 1]) ||
+          (j > 0 && C[i][j] === C[i][j - 1])) {
+        ins(child2);
+        j--;
+      } else if (i > 0 && C[i][j] === C[i - 1][j]) {
+        del(child1);
+        i--;
+      } else if (i > 0 && j > 0 && C[i][j] - C[i - 1][j - 1] < 1) {
+        if (typeof child2 === "string") {
+          ins(child2);
+          j--;
+        } else {
+          mod(R[i][j]);
+          i--;
+          j--;
+        }
+      } else {
+        keep(R[i][j]);
+        i--;
+        j--;
+      }
+    }
+
+    return result;
+  }
+
+  compressSpaces(s) {
+    return s.replace(/\s+/, " ");
+  }
+
+  // Calculates a score for the difference, in [0,1] range.
+  // 1 means no difference, and 0 means completely different.
+  resultToScore(r) {
+    if (r.same + r.del + r.ins === 0) {
+      return 1;
+    }
+
+    const fragmentFactor = r.stateCount > 2 ? (1 + (r.stateCount - 2) / 10) : 1;
+    const score = r.same / (r.same + (r.del + r.ins) * fragmentFactor);
+
+    const THRESHOLD = 0.1;
+    if (score < THRESHOLD) {
+      return 0;
+    }
+    return score;
+  }
+
+  addResult(r1, r2) {
+    let stateCount = r1.stateCount;
+    if (r1.state !== r2.state) {
+      stateCount++;
+    }
+    return {
+      del: r1.del + r2.del,
+      ins: r1.ins + r2.ins,
+      same: r1.same + r2.same,
+      state: r2.state,
+      stateCount,
+    };
+  }
+
+  // Convert LCS maps into diff tree.
+  LCSToDiff(parentObj, nodeObj1, nodeObj2) {
+    if (typeof nodeObj1 !== typeof nodeObj2) {
+      this.prependChildIns(parentObj, nodeObj2);
+      this.prependChildDel(parentObj, nodeObj1);
+      return;
+    }
+
+    if (typeof nodeObj1 === "string") {
+      if (nodeObj1 !== nodeObj2) {
+        this.prependChildIns(parentObj, nodeObj2);
+        this.prependChildDel(parentObj, nodeObj1);
+        return;
+      }
+
+      this.prependChild(parentObj, nodeObj2);
+      return;
+    }
+
+    if (nodeObj1.name !== nodeObj2.name) {
+      this.prependChildIns(parentObj, nodeObj2);
+      this.prependChildDel(parentObj, nodeObj1);
+      return;
+    }
+
+    if (nodeObj1.id !== nodeObj2.id) {
+      this.prependChildIns(parentObj, nodeObj2);
+      this.prependChildDel(parentObj, nodeObj1);
+      return;
+    }
+
+    const len1 = nodeObj1.childNodes.length;
+    const len2 = nodeObj2.childNodes.length;
+
+    if (len1 === 0) {
+      if (len2 === 0) {
+        this.prependChild(parentObj, nodeObj2);
+        return;
+      }
+      this.prependChildIns(parentObj, nodeObj2);
+      this.prependChildDel(parentObj, nodeObj1);
+      return;
+    }
+    if (len2 === 0) {
+      this.prependChildIns(parentObj, nodeObj2);
+      this.prependChildDel(parentObj, nodeObj1);
+      return;
+    }
+
+    const C = this.LCSMapMap.get(nodeObj1).get(nodeObj2);
+
+    const ins = child2 => {
+      this.prependChildIns(parentObj, child2);
+    };
+    const del = child1 => {
+      this.prependChildDel(parentObj, child1);
+    };
+    const mod = (child1, child2) => {
+      const box = this.shallowClone(child2);
+
+      this.LCSToDiff(box, child1, child2);
+
+      this.prependChild(parentObj, box);
+    };
+    const keep = child2 => {
+      this.prependChild(parentObj, child2);
+    };
+
+    for (let i = len1, j = len2; i > 0 || j > 0;) {
+      const child1 = nodeObj1.childNodes[i - 1];
+      const child2 = nodeObj2.childNodes[j - 1];
+
+      if ((i > 0 && j > 0 && C[i][j] === C[i - 1][j - 1]) ||
+          (j > 0 && C[i][j] === C[i][j - 1])) {
+        ins(child2);
+        j--;
+      } else if (i > 0 && C[i][j] === C[i - 1][j]) {
+        del(child1);
+        i--;
+      } else if (i > 0 && j > 0 && C[i][j] - C[i - 1][j - 1] < 1) {
+        if (typeof child2 === "string") {
+          ins(child2);
+          j--;
+        } else {
+          mod(child1, child2);
+          i--;
+          j--;
+        }
+      } else {
+        keep(child2);
+        i--;
+        j--;
+      }
+    }
+  }
+
+  // Prepend `nodeObj` to `parentObj`'s first child.
+  prependChild(parentObj, nodeObj) {
+    parentObj.childNodes.unshift(nodeObj);
+  }
+
+  isTableRowOrCell(nodeObj) {
+    if (typeof nodeObj !== "object") {
+      return false;
+    }
+    const name = nodeObj.name;
+    return name === "tr" || name === "th" || name === "td";
+  }
+
+  isListItem(nodeObj) {
+    if (typeof nodeObj !== "object") {
+      return false;
+    }
+    const name = nodeObj.name;
+    return name === "li";
+  }
+
+  addClass(nodeObj, className) {
+    if ("class" in nodeObj.attributes) {
+      nodeObj.attributes.class += " " + className;
+    } else {
+      nodeObj.attributes.class = className;
+    }
+  }
+
+  // Prepend `nodeObj` to `parentObj`'s first child, wrapping `nodeObj` with
+  // `ins`.
+  prependChildIns(parentObj, nodeObj) {
+    if (this.isListItem(nodeObj) || this.isTableRowOrCell(nodeObj)) {
+      const newNodeObj = this.shallowClone(nodeObj);
+      if (this.isTableRowOrCell(nodeObj)) {
+        this.addClass(newNodeObj, "diff-new htmldiff-change");
+      }
+      for (let i = nodeObj.childNodes.length - 1; i >= 0; i--) {
+        const child = nodeObj.childNodes[i];
+        this.prependChildIns(newNodeObj, child);
+      }
+      this.prependChild(parentObj, newNodeObj);
+      return;
+    }
+
+    if (parentObj.childNodes.length > 0) {
+      const firstChild = parentObj.childNodes[0];
+      if (typeof firstChild === "object" &&
+          firstChild.name === "ins") {
+        this.prependChild(firstChild, nodeObj);
+        return;
+      }
+    }
+
+    this.prependChild(parentObj, this.toIns(nodeObj));
+  }
+
+  // Clone nodeObj, without child nodes.
+  shallowClone(nodeObj) {
+    return {
+      attributes: nodeObj.attributes,
+      childNodes: [],
+      id: nodeObj.id,
+      name: nodeObj.name,
+    };
+  }
+
+  // Prepend `nodeObj` to `parentObj`'s first child, wrapping `nodeObj` with
+  // `del`.
+  prependChildDel(parentObj, nodeObj) {
+    if (this.isListItem(nodeObj) || this.isTableRowOrCell(nodeObj)) {
+      const newNodeObj = this.shallowClone(nodeObj);
+      if (this.isTableRowOrCell(nodeObj)) {
+        this.addClass(newNodeObj, "diff-old htmldiff-change");
+      }
+      for (let i = nodeObj.childNodes.length - 1; i >= 0; i--) {
+        const child = nodeObj.childNodes[i];
+        this.prependChildDel(newNodeObj, child);
+      }
+      this.prependChild(parentObj, newNodeObj);
+      return;
+    }
+
+    if (parentObj.childNodes.length > 0) {
+      const firstChild = parentObj.childNodes[0];
+      if (typeof firstChild === "object" &&
+          firstChild.name === "del") {
+        this.prependChild(firstChild, nodeObj);
+        return;
+      }
+    }
+
+    this.prependChild(parentObj, this.toDel(nodeObj));
+  }
+
+  toIns(nodeObj) {
+    const ins = this.createIns();
+    ins.childNodes.push(nodeObj);
+    return ins;
+  }
+
+  createIns() {
+    return this.createPlainObject("ins", undefined, {
+      "class": "diff-new htmldiff-change",
+    });
+  }
+
+  toDel(nodeObj) {
+    const del = this.createDel();
+    del.childNodes.push(nodeObj);
+    return del;
+  }
+
+  createDel() {
+    return this.createPlainObject("del", undefined, {
+      "class": "diff-old htmldiff-change",
+    });
+  }
+
+  // Create a plain object representation for an empty DOM element.
+  createPlainObject(name, id = undefined, attributes = {}) {
+    return {
+      attributes,
+      childNodes: [],
+      id,
+      name,
+      textLength: 0,
+    };
+  }
+}
+
+onmessage = msg => {
+  const id = msg.data.id;
+  const data = new HTMLTreeDiffWorker().run(msg.data.data);
+  postMessage({
+    data,
+    id,
+  });
+};
diff --git a/respec-w3c-common.js b/respec-w3c-common.js
index 8e36aed2d..2ee853c5e 100644
--- a/respec-w3c-common.js
+++ b/respec-w3c-common.js
@@ -1,4 +1,4 @@
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u=Object.freeze({__proto__:null,l10n:c,lang:l,name:"core/l10n",run:function(e){e.l10n=c[l]||c.en}});const d=(e,t)=>t.some((t=>e instanceof t));let p,f;const h=new WeakMap,m=new WeakMap,g=new WeakMap;let b={get(e,t,n){if(e instanceof IDBTransaction){if("done"===t)return h.get(e);if("store"===t)return n.objectStoreNames[1]?void 0:n.objectStore(n.objectStoreNames[0])}return $(e[t])},set:(e,t,n)=>(e[t]=n,!0),has:(e,t)=>e instanceof IDBTransaction&&("done"===t||"store"===t)||t in e};function y(e){b=e(b)}function w(e){return(f||(f=[IDBCursor.prototype.advance,IDBCursor.prototype.continue,IDBCursor.prototype.continuePrimaryKey])).includes(e)?function(...t){return e.apply(k(this),t),$(this.request)}:function(...t){return $(e.apply(k(this),t))}}function v(e){return"function"==typeof e?w(e):(e instanceof IDBTransaction&&function(e){if(h.has(e))return;const t=new Promise(((t,n)=>{const 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null;return{type:e,value:this.params.rhsIsList?n:this.params.tokens.secondaryName?ie(t.secondaryName.value):null}}get arguments(){const{rhsIsList:e,list:t}=this.params;return!t||e?[]:t}*validate(e){const{name:t}=this;if("LegacyNoInterfaceObject"===t){const e="`[LegacyNoInterfaceObject]` extended attribute is an undesirable feature that may be removed from Web IDL in the future. 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t=this.tokens.prefix||this.tokens.base,n=this.tokens.prefix?[this.tokens.prefix.value,e.ts.trivia(this.tokens.base.trivia)]:[],r=e.reference(e.ts.wrap([...n,this.tokens.base.value,e.token(this.tokens.postfix)]),{unescaped:this.idlType,context:this});return e.ts.wrap([e.ts.trivia(t.trivia),r])})(),e.token(this.tokens.nullable),e.token(this.tokens.separator)])}}function ee(e,t,n){return()=>{const r=n.indexOf(t);n.splice(r,1),!n.length&&e.tokens.base.trivia.match(/^\s$/)&&(e.tokens.base.trivia=""),e.tokens.base.value="AllowSharedBufferSource"}}class te extends M{static parse(e){const t=e.consume("=");if(!t)return null;const n=ce(e)||e.consumeKind("string")||e.consume("null","[","{")||e.error("No value for default"),r=[n];if("["===n.value){const t=e.consume("]")||e.error("Default sequence value must be empty");r.push(t)}else if("{"===n.value){const t=e.consume("}")||e.error("Default dictionary value must be empty");r.push(t)}return new 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ie(this.tokens.name.value)}*validate(e){yield*this.extAttrs.validate(e),yield*this.idlType.validate(e);const t=q(this.idlType,e,{useNullableInner:!0});if(t)if(this.idlType.nullable){const e="Dictionary arguments cannot be nullable.";yield O(this.tokens.name,this,"no-nullable-dict-arg",e)}else if(this.optional){if(!this.default){const e="Optional dictionary arguments must have a default value of `{}`.";yield O(this.tokens.name,this,"dict-arg-default",e,{autofix:re(this)})}}else if(this.parent&&!z(t.dictionary,e)&&function(e){const t=e.parent.arguments||e.parent.list,n=t.indexOf(e),r=t.slice(n+1).some((e=>!e.optional));return!r}(this)){const e="Dictionary argument must be optional if it has no required fields";yield O(this.tokens.name,this,"dict-arg-optional",e,{autofix:(n=this,()=>{const e=be(n.idlType);n.tokens.optional={...e,type:"optional",value:"optional"},e.trivia=" ",re(n)()})})}var n}write(e){return e.ts.wrap([this.extAttrs.write(e),e.token(this.tokens.optional),e.ts.type(this.idlType.write(e)),e.token(this.tokens.variadic),e.name_token(this.tokens.name,{data:this}),this.default?this.default.write(e):"",e.token(this.tokens.separator)])}}function re(e){return()=>{e.default=te.parse(new Ce(" = {}"))}}class se extends M{static parse(e,{special:t,regular:n}={}){const r={special:t},s=ye(new se({source:e.source,tokens:r}));return t&&"stringifier"===t.value&&(r.termination=e.consume(";"),r.termination)?(s.arguments=[],s):(t||n||(r.special=e.consume("getter","setter","deleter")),s.idlType=fe(e)||e.error("Missing return type"),r.name=e.consumeKind("identifier")||e.consume("includes"),r.open=e.consume("(")||e.error("Invalid operation"),s.arguments=de(e),r.close=e.consume(")")||e.error("Unterminated operation"),r.termination=e.consume(";")||e.error("Unterminated operation, expected `;`"),s.this)}get type(){return"operation"}get name(){const{name:e}=this.tokens;return e?ie(e.value):""}get 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e[0]}return""}function ge(e){return()=>{if(e.extAttrs.length){const t=new Ce("Exposed=Window,"),n=K.parse(t);n.tokens.separator=t.consume(",");const r=e.extAttrs[0];/^\s/.test(r.tokens.name.trivia)||(r.tokens.name.trivia=` ${r.tokens.name.trivia}`),e.extAttrs.unshift(n)}else{ye(e).extAttrs=Z.parse(new Ce("[Exposed=Window]"));const t=e.tokens.base.trivia;e.extAttrs.tokens.open.trivia=t,e.tokens.base.trivia=`\n${me(t)}`}}}function be(e){if(e.extAttrs.length)return e.extAttrs.tokens.open;if("operation"===e.type&&!e.special)return be(e.idlType);return Object.values(e.tokens).sort(((e,t)=>e.index-t.index))[0]}function ye(e,t){if(t||(t=e),!e)return e;return new Proxy(e,{get(e,t){const n=e[t];return Array.isArray(n)&&"source"!==t?ye(n,e):n},set(e,n,r){if(e[n]=r,!r)return!0;if(Array.isArray(r))for(const e of r)void 0!==e.parent&&(e.parent=t);else void 0!==r.parent&&(r.parent=t);return!0}})}const we={decimal:/-?(?=[0-9]*\.|[0-9]+[eE])(([0-9]+\.[0-9]*|[0-9]*\.[0-9]+)([Ee][-+]?[0-9]+)?|[0-9]+[Ee][-+]?[0-9]+)/y,integer:/-?(0([Xx][0-9A-Fa-f]+|[0-7]*)|[1-9][0-9]*)/y,identifier:/[_-]?[A-Za-z][0-9A-Z_a-z-]*/y,string:/"[^"]*"/y,whitespace:/[\t\n\r ]+/y,comment:/\/\/.*|\/\*[\s\S]*?\*\//y,other:/[^\t\n\r 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n=0,r="",s=1,o=0;for(;n<e.length;){const a=e.charAt(n);let c=-1;if(/[\t\n\r ]/.test(a)?c=i("whitespace",{noFlushTrivia:!0}):"/"===a&&(c=i("comment",{noFlushTrivia:!0})),-1!==c){const e=t.pop().value;s+=(e.match(/\n/g)||[]).length,r+=e,o-=1}else if(/[-0-9.A-Z_a-z]/.test(a)){if(c=i("decimal"),-1===c&&(c=i("integer")),-1===c){c=i("identifier");const e=t.length-1,n=t[e];if(-1!==c){if(Se.includes(n.value)){const r=`${ie(n.value)} is a reserved identifier and must not be used.`;throw new Re(j(t,e,null,r))}xe.includes(n.value)&&(n.type="inline")}}}else'"'===a&&(c=i("string"));for(const i of _e)if(e.startsWith(i,n)){t.push({type:"inline",value:i,trivia:r,line:s,index:o}),r="",n+=i.length,c=n;break}if(-1===c&&(c=i("other")),-1===c)throw new Error("Token stream not progressing");n=c,o+=1}return t.push({type:"eof",value:"",trivia:r,line:s,index:o}),t;function i(i,{noFlushTrivia:a}={}){const c=we[i];c.lastIndex=n;const l=c.exec(e);return l?(t.push({type:i,value:l[0],trivia:r,line:s,index:o}),a||(r=""),c.lastIndex):-1}}(e),this.position=0}error(e){throw new Re(j(this.source,this.position,this.current,e))}probeKind(e){return this.source.length>this.position&&this.source[this.position].type===e}probe(e){return this.probeKind("inline")&&this.source[this.position].value===e}consumeKind(...e){for(const t of e){if(!this.probeKind(t))continue;const e=this.source[this.position];return this.position++,e}}consume(...e){if(!this.probeKind("inline"))return;const t=this.source[this.position];for(const n of e)if(t.value===n)return this.position++,t}consumeIdentifier(e){if(this.probeKind("identifier")&&this.source[this.position].value===e)return this.consumeKind("identifier")}unconsume(e){this.position=e}}class Re extends Error{constructor({message:e,bareMessage:t,context:n,line:r,sourceName:s,input:o,tokens:i}){super(e),this.name="WebIDLParseError",this.bareMessage=t,this.context=n,this.line=r,this.sourceName=s,this.input=o,this.tokens=i}}class Ee extends W{static parse(e){const t=e.consumeKind("string");if(t)return new Ee({source:e.source,tokens:{value:t}})}get type(){return"enum-value"}get value(){return super.value.slice(1,-1)}write(e){const{parent:t}=this;return e.ts.wrap([e.ts.trivia(this.tokens.value.trivia),e.ts.definition(e.ts.wrap(['"',e.ts.name(this.value,{data:this,parent:t}),'"']),{data:this,parent:t}),e.token(this.tokens.separator)])}}class Ae extends M{static parse(e){const t={};if(t.base=e.consume("enum"),!t.base)return;t.name=e.consumeKind("identifier")||e.error("No name for enum");const n=ye(new Ae({source:e.source,tokens:t}));return e.current=n.this,t.open=e.consume("{")||e.error("Bodyless enum"),n.values=ae(e,{parser:Ee.parse,allowDangler:!0,listName:"enumeration"}),e.probeKind("string")&&e.error("No comma between enum values"),t.close=e.consume("}")||e.error("Unexpected value in enum"),n.values.length||e.error("No value in enum"),t.termination=e.consume(";")||e.error("No semicolon after enum"),n.this}get type(){return"enum"}get name(){return ie(this.tokens.name.value)}write(e){return e.ts.definition(e.ts.wrap([this.extAttrs.write(e),e.token(this.tokens.base),e.name_token(this.tokens.name,{data:this}),e.token(this.tokens.open),e.ts.wrap(this.values.map((t=>t.write(e)))),e.token(this.tokens.close),e.token(this.tokens.termination)]),{data:this})}}class Te extends M{static parse(e){const t=e.consumeKind("identifier");if(!t)return;const n={target:t};if(n.includes=e.consume("includes"),n.includes)return n.mixin=e.consumeKind("identifier")||e.error("Incomplete includes statement"),n.termination=e.consume(";")||e.error("No terminating ; for includes statement"),new Te({source:e.source,tokens:n});e.unconsume(t.index)}get type(){return"includes"}get target(){return ie(this.tokens.target.value)}get includes(){return ie(this.tokens.mixin.value)}write(e){return e.ts.definition(e.ts.wrap([this.extAttrs.write(e),e.reference_token(this.tokens.target,this),e.token(this.tokens.includes),e.reference_token(this.tokens.mixin,this),e.token(this.tokens.termination)]),{data:this})}}class Le extends M{static parse(e){const t={},n=ye(new Le({source:e.source,tokens:t}));if(t.base=e.consume("typedef"),t.base)return n.idlType=pe(e,"typedef-type")||e.error("Typedef lacks a type"),t.name=e.consumeKind("identifier")||e.error("Typedef lacks a name"),e.current=n.this,t.termination=e.consume(";")||e.error("Unterminated typedef, expected `;`"),n.this}get type(){return"typedef"}get name(){return ie(this.tokens.name.value)}*validate(e){yield*this.idlType.validate(e)}write(e){return e.ts.definition(e.ts.wrap([this.extAttrs.write(e),e.token(this.tokens.base),e.ts.type(this.idlType.write(e)),e.name_token(this.tokens.name,{data:this}),e.token(this.tokens.termination)]),{data:this})}}class Pe extends M{static parse(e,t){const n={base:t},r=ye(new Pe({source:e.source,tokens:n}));return n.name=e.consumeKind("identifier")||e.error("Callback lacks a name"),e.current=r.this,n.assign=e.consume("=")||e.error("Callback lacks an assignment"),r.idlType=fe(e)||e.error("Callback lacks a return type"),n.open=e.consume("(")||e.error("Callback lacks parentheses for arguments"),r.arguments=de(e),n.close=e.consume(")")||e.error("Unterminated callback"),n.termination=e.consume(";")||e.error("Unterminated callback, expected `;`"),r.this}get type(){return"callback"}get name(){return ie(this.tokens.name.value)}*validate(e){yield*this.extAttrs.validate(e),yield*this.idlType.validate(e)}write(e){return 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{2,}|\\)\n(?!\s*$)/,qt="\\p{P}\\p{S}",zt=mt(/^((?![*_])[\spunctuation])/,"u").replace(/punctuation/g,qt).getRegex(),Ut=mt(/^(?:\*+(?:((?!\*)[punct])|[^\s*]))|^_+(?:((?!_)[punct])|([^\s_]))/,"u").replace(/punct/g,qt).getRegex(),Wt=mt("^[^_*]*?__[^_*]*?\\*[^_*]*?(?=__)|[^*]+(?=[^*])|(?!\\*)[punct](\\*+)(?=[\\s]|$)|[^punct\\s](\\*+)(?!\\*)(?=[punct\\s]|$)|(?!\\*)[punct\\s](\\*+)(?=[^punct\\s])|[\\s](\\*+)(?!\\*)(?=[punct])|(?!\\*)[punct](\\*+)(?!\\*)(?=[punct])|[^punct\\s](\\*+)(?=[^punct\\s])","gu").replace(/punct/g,qt).getRegex(),Ft=mt("^[^_*]*?\\*\\*[^_*]*?_[^_*]*?(?=\\*\\*)|[^_]+(?=[^_])|(?!_)[punct](_+)(?=[\\s]|$)|[^punct\\s](_+)(?!_)(?=[punct\\s]|$)|(?!_)[punct\\s](_+)(?=[^punct\\s])|[\\s](_+)(?!_)(?=[punct])|(?!_)[punct](_+)(?!_)(?=[punct])","gu").replace(/punct/g,qt).getRegex(),Bt=mt(/\\([punct])/,"gu").replace(/punct/g,qt).getRegex(),Ht=mt(/^<(scheme:[^\s\x00-\x1f<>]*|email)>/).replace("scheme",/[a-zA-Z][a-zA-Z0-9+.-]{1,31}/).replace("email",/[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+(@)[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+(?![-_])/).getRegex(),Gt=mt(Tt).replace("(?:--\x3e|$)","--\x3e").getRegex(),Vt=mt("^comment|^</[a-zA-Z][\\w:-]*\\s*>|^<[a-zA-Z][\\w-]*(?:attribute)*?\\s*/?>|^<\\?[\\s\\S]*?\\?>|^<![a-zA-Z]+\\s[\\s\\S]*?>|^<!\\[CDATA\\[[\\s\\S]*?\\]\\]>").replace("comment",Gt).replace("attribute",/\s+[a-zA-Z:_][\w.:-]*(?:\s*=\s*"[^"]*"|\s*=\s*'[^']*'|\s*=\s*[^\s"'=<>`]+)?/).getRegex(),Yt=/(?:\[(?:\\.|[^\[\]\\])*\]|\\.|`[^`]*`|[^\[\]\\`])*?/,Kt=mt(/^!?\[(label)\]\(\s*(href)(?:\s+(title))?\s*\)/).replace("label",Yt).replace("href",/<(?:\\.|[^\n<>\\])+>|[^\s\x00-\x1f]*/).replace("title",/"(?:\\"?|[^"\\])*"|'(?:\\'?|[^'\\])*'|\((?:\\\)?|[^)\\])*\)/).getRegex(),Zt=mt(/^!?\[(label)\]\[(ref)\]/).replace("label",Yt).replace("ref",Ct).getRegex(),Jt=mt(/^!?\[(ref)\](?:\[\])?/).replace("ref",Ct).getRegex(),Qt={_backpedal:bt,anyPunctuation:Bt,autolink:Ht,blockSkip:/\[[^[\]]*?\]\([^\(\)]*?\)|`[^`]*?`|<[^<>]*?>/g,br:Mt,code:/^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,del:bt,emStrongLDelim:Ut,emStrongRDelimAst:Wt,emStrongRDelimUnd:Ft,escape:Ot,link:Kt,nolink:Jt,punctuation:zt,reflink:Zt,reflinkSearch:mt("reflink|nolink(?!\\()","g").replace("reflink",Zt).replace("nolink",Jt).getRegex(),tag:Vt,text:/^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*_]|\b_|$)|[^ ](?= {2,}\n)))/,url:bt},Xt={...Qt,link:mt(/^!?\[(label)\]\((.*?)\)/).replace("label",Yt).getRegex(),reflink:mt(/^!?\[(label)\]\s*\[([^\]]*)\]/).replace("label",Yt).getRegex()},en={...Qt,escape:mt(Ot).replace("])","~|])").getRegex(),url:mt(/^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,"i").replace("email",/[A-Za-z0-9._+-]+(@)[a-zA-Z0-9-_]+(?:\.[a-zA-Z0-9-_]*[a-zA-Z0-9])+(?![-_])/).getRegex(),_backpedal:/(?:[^?!.,:;*_'"~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_'"~)]+(?!$))+/,del:/^(~~?)(?=[^\s~])([\s\S]*?[^\s~])\1(?=[^~]|$)/,text:/^([`~]+|[^`~])(?:(?= {2,}\n)|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)))/},tn={...en,br:mt(Mt).replace("{2,}","*").getRegex(),text:mt(en.text).replace("\\b_","\\b_| {2,}\\n").replace(/\{2,\}/g,"*").getRegex()},nn={normal:It,gfm:Nt,pedantic:jt},rn={normal:Qt,gfm:en,breaks:tn,pedantic:Xt};class sn{tokens;options;state;tokenizer;inlineQueue;constructor(e){this.tokens=[],this.tokens.links=Object.create(null),this.options=e||rt,this.options.tokenizer=this.options.tokenizer||new $t,this.tokenizer=this.options.tokenizer,this.tokenizer.options=this.options,this.tokenizer.lexer=this,this.inlineQueue=[],this.state={inLink:!1,inRawBlock:!1,top:!0};const t={block:nn.normal,inline:rn.normal};this.options.pedantic?(t.block=nn.pedantic,t.inline=rn.pedantic):this.options.gfm&&(t.block=nn.gfm,this.options.breaks?t.inline=rn.breaks:t.inline=rn.gfm),this.tokenizer.rules=t}static get rules(){return{block:nn,inline:rn}}static lex(e,t){return new sn(t).lex(e)}static lexInline(e,t){return new sn(t).inlineTokens(e)}lex(e){e=e.replace(/\r\n|\r/g,"\n"),this.blockTokens(e,this.tokens);for(let e=0;e<this.inlineQueue.length;e++){const t=this.inlineQueue[e];this.inlineTokens(t.src,t.tokens)}return this.inlineQueue=[],this.tokens}blockTokens(e,t=[]){let n,r,s,o;for(e=this.options.pedantic?e.replace(/\t/g,"    ").replace(/^ +$/gm,""):e.replace(/^( *)(\t+)/gm,((e,t,n)=>t+"    ".repeat(n.length)));e;)if(!(this.options.extensions&&this.options.extensions.block&&this.options.extensions.block.some((r=>!!(n=r.call({lexer:this},e,t))&&(e=e.substring(n.raw.length),t.push(n),!0)))))if(n=this.tokenizer.space(e))e=e.substring(n.raw.length),1===n.raw.length&&t.length>0?t[t.length-1].raw+="\n":t.push(n);else if(n=this.tokenizer.code(e))e=e.substring(n.raw.length),r=t[t.length-1],!r||"paragraph"!==r.type&&"text"!==r.type?t.push(n):(r.raw+="\n"+n.raw,r.text+="\n"+n.text,this.inlineQueue[this.inlineQueue.length-1].src=r.text);else if(n=this.tokenizer.fences(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.heading(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.hr(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.blockquote(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.list(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.html(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.def(e))e=e.substring(n.raw.length),r=t[t.length-1],!r||"paragraph"!==r.type&&"text"!==r.type?this.tokens.links[n.tag]||(this.tokens.links[n.tag]={href:n.href,title:n.title}):(r.raw+="\n"+n.raw,r.text+="\n"+n.raw,this.inlineQueue[this.inlineQueue.length-1].src=r.text);else if(n=this.tokenizer.table(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.lheading(e))e=e.substring(n.raw.length),t.push(n);else{if(s=e,this.options.extensions&&this.options.extensions.startBlock){let t=1/0;const n=e.slice(1);let r;this.options.extensions.startBlock.forEach((e=>{r=e.call({lexer:this},n),"number"==typeof r&&r>=0&&(t=Math.min(t,r))})),t<1/0&&t>=0&&(s=e.substring(0,t+1))}if(this.state.top&&(n=this.tokenizer.paragraph(s)))r=t[t.length-1],o&&"paragraph"===r.type?(r.raw+="\n"+n.raw,r.text+="\n"+n.text,this.inlineQueue.pop(),this.inlineQueue[this.inlineQueue.length-1].src=r.text):t.push(n),o=s.length!==e.length,e=e.substring(n.raw.length);else if(n=this.tokenizer.text(e))e=e.substring(n.raw.length),r=t[t.length-1],r&&"text"===r.type?(r.raw+="\n"+n.raw,r.text+="\n"+n.text,this.inlineQueue.pop(),this.inlineQueue[this.inlineQueue.length-1].src=r.text):t.push(n);else if(e){const t="Infinite loop on byte: "+e.charCodeAt(0);if(this.options.silent){console.error(t);break}throw new Error(t)}}return this.state.top=!0,t}inline(e,t=[]){return this.inlineQueue.push({src:e,tokens:t}),t}inlineTokens(e,t=[]){let n,r,s,o,i,a,c=e;if(this.tokens.links){const e=Object.keys(this.tokens.links);if(e.length>0)for(;null!=(o=this.tokenizer.rules.inline.reflinkSearch.exec(c));)e.includes(o[0].slice(o[0].lastIndexOf("[")+1,-1))&&(c=c.slice(0,o.index)+"["+"a".repeat(o[0].length-2)+"]"+c.slice(this.tokenizer.rules.inline.reflinkSearch.lastIndex))}for(;null!=(o=this.tokenizer.rules.inline.blockSkip.exec(c));)c=c.slice(0,o.index)+"["+"a".repeat(o[0].length-2)+"]"+c.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);for(;null!=(o=this.tokenizer.rules.inline.anyPunctuation.exec(c));)c=c.slice(0,o.index)+"++"+c.slice(this.tokenizer.rules.inline.anyPunctuation.lastIndex);for(;e;)if(i||(a=""),i=!1,!(this.options.extensions&&this.options.extensions.inline&&this.options.extensions.inline.some((r=>!!(n=r.call({lexer:this},e,t))&&(e=e.substring(n.raw.length),t.push(n),!0)))))if(n=this.tokenizer.escape(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.tag(e))e=e.substring(n.raw.length),r=t[t.length-1],r&&"text"===n.type&&"text"===r.type?(r.raw+=n.raw,r.text+=n.text):t.push(n);else if(n=this.tokenizer.link(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.reflink(e,this.tokens.links))e=e.substring(n.raw.length),r=t[t.length-1],r&&"text"===n.type&&"text"===r.type?(r.raw+=n.raw,r.text+=n.text):t.push(n);else if(n=this.tokenizer.emStrong(e,c,a))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.codespan(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.br(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.del(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.autolink(e))e=e.substring(n.raw.length),t.push(n);else if(this.state.inLink||!(n=this.tokenizer.url(e))){if(s=e,this.options.extensions&&this.options.extensions.startInline){let t=1/0;const n=e.slice(1);let r;this.options.extensions.startInline.forEach((e=>{r=e.call({lexer:this},n),"number"==typeof r&&r>=0&&(t=Math.min(t,r))})),t<1/0&&t>=0&&(s=e.substring(0,t+1))}if(n=this.tokenizer.inlineText(s))e=e.substring(n.raw.length),"_"!==n.raw.slice(-1)&&(a=n.raw.slice(-1)),i=!0,r=t[t.length-1],r&&"text"===r.type?(r.raw+=n.raw,r.text+=n.text):t.push(n);else if(e){const t="Infinite loop on byte: "+e.charCodeAt(0);if(this.options.silent){console.error(t);break}throw new Error(t)}}else e=e.substring(n.raw.length),t.push(n);return t}}class on{options;constructor(e){this.options=e||rt}code(e,t,n){const r=(t||"").match(/^\S*/)?.[0];return e=e.replace(/\n$/,"")+"\n",r?'<pre><code class="language-'+dt(r)+'">'+(n?e:dt(e,!0))+"</code></pre>\n":"<pre><code>"+(n?e:dt(e,!0))+"</code></pre>\n"}blockquote(e){return`<blockquote>\n${e}</blockquote>\n`}html(e,t){return e}heading(e,t,n){return`<h${t}>${e}</h${t}>\n`}hr(){return"<hr>\n"}list(e,t,n){const r=t?"ol":"ul";return"<"+r+(t&&1!==n?' start="'+n+'"':"")+">\n"+e+"</"+r+">\n"}listitem(e,t,n){return`<li>${e}</li>\n`}checkbox(e){return"<input "+(e?'checked="" ':"")+'disabled="" type="checkbox">'}paragraph(e){return`<p>${e}</p>\n`}table(e,t){return t&&(t=`<tbody>${t}</tbody>`),"<table>\n<thead>\n"+e+"</thead>\n"+t+"</table>\n"}tablerow(e){return`<tr>\n${e}</tr>\n`}tablecell(e,t){const n=t.header?"th":"td";return(t.align?`<${n} align="${t.align}">`:`<${n}>`)+e+`</${n}>\n`}strong(e){return`<strong>${e}</strong>`}em(e){return`<em>${e}</em>`}codespan(e){return`<code>${e}</code>`}br(){return"<br>"}del(e){return`<del>${e}</del>`}link(e,t,n){const r=gt(e);if(null===r)return n;let s='<a href="'+(e=r)+'"';return t&&(s+=' title="'+t+'"'),s+=">"+n+"</a>",s}image(e,t,n){const r=gt(e);if(null===r)return n;let s=`<img src="${e=r}" alt="${n}"`;return t&&(s+=` title="${t}"`),s+=">",s}text(e){return e}}class an{strong(e){return e}em(e){return e}codespan(e){return e}del(e){return e}html(e){return e}text(e){return e}link(e,t,n){return""+n}image(e,t,n){return""+n}br(){return""}}class cn{options;renderer;textRenderer;constructor(e){this.options=e||rt,this.options.renderer=this.options.renderer||new on,this.renderer=this.options.renderer,this.renderer.options=this.options,this.textRenderer=new an}static parse(e,t){return new cn(t).parse(e)}static parseInline(e,t){return new cn(t).parseInline(e)}parse(e,t=!0){let n="";for(let r=0;r<e.length;r++){const s=e[r];if(this.options.extensions&&this.options.extensions.renderers&&this.options.extensions.renderers[s.type]){const e=s,t=this.options.extensions.renderers[e.type].call({parser:this},e);if(!1!==t||!["space","hr","heading","code","table","blockquote","list","html","paragraph","text"].includes(e.type)){n+=t||"";continue}}switch(s.type){case"space":continue;case"hr":n+=this.renderer.hr();continue;case"heading":{const e=s;n+=this.renderer.heading(this.parseInline(e.tokens),e.depth,ft(this.parseInline(e.tokens,this.textRenderer)));continue}case"code":{const e=s;n+=this.renderer.code(e.text,e.lang,!!e.escaped);continue}case"table":{const e=s;let t="",r="";for(let t=0;t<e.header.length;t++)r+=this.renderer.tablecell(this.parseInline(e.header[t].tokens),{header:!0,align:e.align[t]});t+=this.renderer.tablerow(r);let o="";for(let t=0;t<e.rows.length;t++){const n=e.rows[t];r="";for(let t=0;t<n.length;t++)r+=this.renderer.tablecell(this.parseInline(n[t].tokens),{header:!1,align:e.align[t]});o+=this.renderer.tablerow(r)}n+=this.renderer.table(t,o);continue}case"blockquote":{const e=s,t=this.parse(e.tokens);n+=this.renderer.blockquote(t);continue}case"list":{const e=s,t=e.ordered,r=e.start,o=e.loose;let i="";for(let t=0;t<e.items.length;t++){const n=e.items[t],r=n.checked,s=n.task;let a="";if(n.task){const e=this.renderer.checkbox(!!r);o?n.tokens.length>0&&"paragraph"===n.tokens[0].type?(n.tokens[0].text=e+" "+n.tokens[0].text,n.tokens[0].tokens&&n.tokens[0].tokens.length>0&&"text"===n.tokens[0].tokens[0].type&&(n.tokens[0].tokens[0].text=e+" "+n.tokens[0].tokens[0].text)):n.tokens.unshift({type:"text",text:e+" "}):a+=e+" "}a+=this.parse(n.tokens,o),i+=this.renderer.listitem(a,s,!!r)}n+=this.renderer.list(i,t,r);continue}case"html":{const e=s;n+=this.renderer.html(e.text,e.block);continue}case"paragraph":{const e=s;n+=this.renderer.paragraph(this.parseInline(e.tokens));continue}case"text":{let o=s,i=o.tokens?this.parseInline(o.tokens):o.text;for(;r+1<e.length&&"text"===e[r+1].type;)o=e[++r],i+="\n"+(o.tokens?this.parseInline(o.tokens):o.text);n+=t?this.renderer.paragraph(i):i;continue}default:{const e='Token with "'+s.type+'" type was not found.';if(this.options.silent)return console.error(e),"";throw new Error(e)}}}return n}parseInline(e,t){t=t||this.renderer;let n="";for(let r=0;r<e.length;r++){const s=e[r];if(this.options.extensions&&this.options.extensions.renderers&&this.options.extensions.renderers[s.type]){const e=this.options.extensions.renderers[s.type].call({parser:this},s);if(!1!==e||!["escape","html","link","image","strong","em","codespan","br","del","text"].includes(s.type)){n+=e||"";continue}}switch(s.type){case"escape":{const e=s;n+=t.text(e.text);break}case"html":{const e=s;n+=t.html(e.text);break}case"link":{const e=s;n+=t.link(e.href,e.title,this.parseInline(e.tokens,t));break}case"image":{const e=s;n+=t.image(e.href,e.title,e.text);break}case"strong":{const e=s;n+=t.strong(this.parseInline(e.tokens,t));break}case"em":{const e=s;n+=t.em(this.parseInline(e.tokens,t));break}case"codespan":{const e=s;n+=t.codespan(e.text);break}case"br":n+=t.br();break;case"del":{const e=s;n+=t.del(this.parseInline(e.tokens,t));break}case"text":{const e=s;n+=t.text(e.text);break}default:{const e='Token with "'+s.type+'" type was not found.';if(this.options.silent)return console.error(e),"";throw new Error(e)}}}return n}}class ln{options;constructor(e){this.options=e||rt}static passThroughHooks=new Set(["preprocess","postprocess","processAllTokens"]);preprocess(e){return e}postprocess(e){return e}processAllTokens(e){return e}}const un=new class{defaults={async:!1,breaks:!1,extensions:null,gfm:!0,hooks:null,pedantic:!1,renderer:null,silent:!1,tokenizer:null,walkTokens:null};options=this.setOptions;parse=this.#e(sn.lex,cn.parse);parseInline=this.#e(sn.lexInline,cn.parseInline);Parser=cn;Renderer=on;TextRenderer=an;Lexer=sn;Tokenizer=$t;Hooks=ln;constructor(...e){this.use(...e)}walkTokens(e,t){let n=[];for(const r of e)switch(n=n.concat(t.call(this,r)),r.type){case"table":{const e=r;for(const r of e.header)n=n.concat(this.walkTokens(r.tokens,t));for(const r of e.rows)for(const e of r)n=n.concat(this.walkTokens(e.tokens,t));break}case"list":{const e=r;n=n.concat(this.walkTokens(e.items,t));break}default:{const e=r;this.defaults.extensions?.childTokens?.[e.type]?this.defaults.extensions.childTokens[e.type].forEach((r=>{const s=e[r].flat(1/0);n=n.concat(this.walkTokens(s,t))})):e.tokens&&(n=n.concat(this.walkTokens(e.tokens,t)))}}return n}use(...e){const t=this.defaults.extensions||{renderers:{},childTokens:{}};return e.forEach((e=>{const n={...e};if(n.async=this.defaults.async||n.async||!1,e.extensions&&(e.extensions.forEach((e=>{if(!e.name)throw new Error("extension name required");if("renderer"in e){const n=t.renderers[e.name];t.renderers[e.name]=n?function(...t){let r=e.renderer.apply(this,t);return!1===r&&(r=n.apply(this,t)),r}:e.renderer}if("tokenizer"in e){if(!e.level||"block"!==e.level&&"inline"!==e.level)throw new Error("extension level must be 'block' or 'inline'");const n=t[e.level];n?n.unshift(e.tokenizer):t[e.level]=[e.tokenizer],e.start&&("block"===e.level?t.startBlock?t.startBlock.push(e.start):t.startBlock=[e.start]:"inline"===e.level&&(t.startInline?t.startInline.push(e.start):t.startInline=[e.start]))}"childTokens"in e&&e.childTokens&&(t.childTokens[e.name]=e.childTokens)})),n.extensions=t),e.renderer){const t=this.defaults.renderer||new on(this.defaults);for(const n in e.renderer){if(!(n in t))throw new Error(`renderer '${n}' does not exist`);if("options"===n)continue;const r=n,s=e.renderer[r],o=t[r];t[r]=(...e)=>{let n=s.apply(t,e);return!1===n&&(n=o.apply(t,e)),n||""}}n.renderer=t}if(e.tokenizer){const t=this.defaults.tokenizer||new $t(this.defaults);for(const n in e.tokenizer){if(!(n in t))throw new Error(`tokenizer '${n}' does not exist`);if(["options","rules","lexer"].includes(n))continue;const r=n,s=e.tokenizer[r],o=t[r];t[r]=(...e)=>{let n=s.apply(t,e);return!1===n&&(n=o.apply(t,e)),n}}n.tokenizer=t}if(e.hooks){const 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t=this.tokens.prefix||this.tokens.base,n=this.tokens.prefix?[this.tokens.prefix.value,e.ts.trivia(this.tokens.base.trivia)]:[],r=e.reference(e.ts.wrap([...n,this.tokens.base.value,e.token(this.tokens.postfix)]),{unescaped:this.idlType,context:this});return e.ts.wrap([e.ts.trivia(t.trivia),r])})(),e.token(this.tokens.nullable),e.token(this.tokens.separator)])}}function ee(e,t,n){return()=>{const r=n.indexOf(t);n.splice(r,1),!n.length&&e.tokens.base.trivia.match(/^\s$/)&&(e.tokens.base.trivia=""),e.tokens.base.value="AllowSharedBufferSource"}}class te extends M{static parse(e){const t=e.consume("=");if(!t)return null;const n=ce(e)||e.consumeKind("string")||e.consume("null","[","{")||e.error("No value for default"),r=[n];if("["===n.value){const t=e.consume("]")||e.error("Default sequence value must be empty");r.push(t)}else if("{"===n.value){const t=e.consume("}")||e.error("Default dictionary value must be empty");r.push(t)}return new 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ie(this.tokens.name.value)}*validate(e){yield*this.extAttrs.validate(e),yield*this.idlType.validate(e);const t=q(this.idlType,e,{useNullableInner:!0});if(t)if(this.idlType.nullable){const e="Dictionary arguments cannot be nullable.";yield O(this.tokens.name,this,"no-nullable-dict-arg",e)}else if(this.optional){if(!this.default){const e="Optional dictionary arguments must have a default value of `{}`.";yield O(this.tokens.name,this,"dict-arg-default",e,{autofix:re(this)})}}else if(this.parent&&!z(t.dictionary,e)&&function(e){const t=e.parent.arguments||e.parent.list,n=t.indexOf(e),r=t.slice(n+1).some((e=>!e.optional));return!r}(this)){const e="Dictionary argument must be optional if it has no required fields";yield O(this.tokens.name,this,"dict-arg-optional",e,{autofix:(n=this,()=>{const e=be(n.idlType);n.tokens.optional={...e,type:"optional",value:"optional"},e.trivia=" ",re(n)()})})}var n}write(e){return e.ts.wrap([this.extAttrs.write(e),e.token(this.tokens.optional),e.ts.type(this.idlType.write(e)),e.token(this.tokens.variadic),e.name_token(this.tokens.name,{data:this}),this.default?this.default.write(e):"",e.token(this.tokens.separator)])}}function re(e){return()=>{e.default=te.parse(new Ce(" = {}"))}}class se extends M{static parse(e,{special:t,regular:n}={}){const r={special:t},s=ye(new se({source:e.source,tokens:r}));return t&&"stringifier"===t.value&&(r.termination=e.consume(";"),r.termination)?(s.arguments=[],s):(t||n||(r.special=e.consume("getter","setter","deleter")),s.idlType=fe(e)||e.error("Missing return type"),r.name=e.consumeKind("identifier")||e.consume("includes"),r.open=e.consume("(")||e.error("Invalid operation"),s.arguments=de(e),r.close=e.consume(")")||e.error("Unterminated operation"),r.termination=e.consume(";")||e.error("Unterminated operation, expected `;`"),s.this)}get type(){return"operation"}get name(){const{name:e}=this.tokens;return e?ie(e.value):""}get 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e[0]}return""}function ge(e){return()=>{if(e.extAttrs.length){const t=new Ce("Exposed=Window,"),n=K.parse(t);n.tokens.separator=t.consume(",");const r=e.extAttrs[0];/^\s/.test(r.tokens.name.trivia)||(r.tokens.name.trivia=` ${r.tokens.name.trivia}`),e.extAttrs.unshift(n)}else{ye(e).extAttrs=Z.parse(new Ce("[Exposed=Window]"));const t=e.tokens.base.trivia;e.extAttrs.tokens.open.trivia=t,e.tokens.base.trivia=`\n${me(t)}`}}}function be(e){if(e.extAttrs.length)return e.extAttrs.tokens.open;if("operation"===e.type&&!e.special)return be(e.idlType);return Object.values(e.tokens).sort(((e,t)=>e.index-t.index))[0]}function ye(e,t){if(t||(t=e),!e)return e;return new Proxy(e,{get(e,t){const n=e[t];return Array.isArray(n)&&"source"!==t?ye(n,e):n},set(e,n,r){if(e[n]=r,!r)return!0;if(Array.isArray(r))for(const e of r)void 0!==e.parent&&(e.parent=t);else void 0!==r.parent&&(r.parent=t);return!0}})}const we={decimal:/-?(?=[0-9]*\.|[0-9]+[eE])(([0-9]+\.[0-9]*|[0-9]*\.[0-9]+)([Ee][-+]?[0-9]+)?|[0-9]+[Ee][-+]?[0-9]+)/y,integer:/-?(0([Xx][0-9A-Fa-f]+|[0-7]*)|[1-9][0-9]*)/y,identifier:/[_-]?[A-Za-z][0-9A-Z_a-z-]*/y,string:/"[^"]*"/y,whitespace:/[\t\n\r ]+/y,comment:/\/\/.*|\/\*[\s\S]*?\*\//y,other:/[^\t\n\r 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n=0,r="",s=1,o=0;for(;n<e.length;){const a=e.charAt(n);let c=-1;if(/[\t\n\r ]/.test(a)?c=i("whitespace",{noFlushTrivia:!0}):"/"===a&&(c=i("comment",{noFlushTrivia:!0})),-1!==c){const e=t.pop().value;s+=(e.match(/\n/g)||[]).length,r+=e,o-=1}else if(/[-0-9.A-Z_a-z]/.test(a)){if(c=i("decimal"),-1===c&&(c=i("integer")),-1===c){c=i("identifier");const e=t.length-1,n=t[e];if(-1!==c){if(Se.includes(n.value)){const r=`${ie(n.value)} is a reserved identifier and must not be used.`;throw new Re(j(t,e,null,r))}xe.includes(n.value)&&(n.type="inline")}}}else'"'===a&&(c=i("string"));for(const i of _e)if(e.startsWith(i,n)){t.push({type:"inline",value:i,trivia:r,line:s,index:o}),r="",n+=i.length,c=n;break}if(-1===c&&(c=i("other")),-1===c)throw new Error("Token stream not progressing");n=c,o+=1}return t.push({type:"eof",value:"",trivia:r,line:s,index:o}),t;function i(i,{noFlushTrivia:a}={}){const c=we[i];c.lastIndex=n;const l=c.exec(e);return l?(t.push({type:i,value:l[0],trivia:r,line:s,index:o}),a||(r=""),c.lastIndex):-1}}(e),this.position=0}error(e){throw new Re(j(this.source,this.position,this.current,e))}probeKind(e){return this.source.length>this.position&&this.source[this.position].type===e}probe(e){return this.probeKind("inline")&&this.source[this.position].value===e}consumeKind(...e){for(const t of e){if(!this.probeKind(t))continue;const e=this.source[this.position];return this.position++,e}}consume(...e){if(!this.probeKind("inline"))return;const t=this.source[this.position];for(const n of e)if(t.value===n)return this.position++,t}consumeIdentifier(e){if(this.probeKind("identifier")&&this.source[this.position].value===e)return this.consumeKind("identifier")}unconsume(e){this.position=e}}class Re extends Error{constructor({message:e,bareMessage:t,context:n,line:r,sourceName:s,input:o,tokens:i}){super(e),this.name="WebIDLParseError",this.bareMessage=t,this.context=n,this.line=r,this.sourceName=s,this.input=o,this.tokens=i}}class Ee extends W{static parse(e){const t=e.consumeKind("string");if(t)return new Ee({source:e.source,tokens:{value:t}})}get type(){return"enum-value"}get value(){return super.value.slice(1,-1)}write(e){const{parent:t}=this;return e.ts.wrap([e.ts.trivia(this.tokens.value.trivia),e.ts.definition(e.ts.wrap(['"',e.ts.name(this.value,{data:this,parent:t}),'"']),{data:this,parent:t}),e.token(this.tokens.separator)])}}class Ae extends M{static parse(e){const t={};if(t.base=e.consume("enum"),!t.base)return;t.name=e.consumeKind("identifier")||e.error("No name for enum");const n=ye(new Ae({source:e.source,tokens:t}));return e.current=n.this,t.open=e.consume("{")||e.error("Bodyless enum"),n.values=ae(e,{parser:Ee.parse,allowDangler:!0,listName:"enumeration"}),e.probeKind("string")&&e.error("No comma between enum values"),t.close=e.consume("}")||e.error("Unexpected value in enum"),n.values.length||e.error("No value in enum"),t.termination=e.consume(";")||e.error("No semicolon after enum"),n.this}get type(){return"enum"}get name(){return ie(this.tokens.name.value)}write(e){return e.ts.definition(e.ts.wrap([this.extAttrs.write(e),e.token(this.tokens.base),e.name_token(this.tokens.name,{data:this}),e.token(this.tokens.open),e.ts.wrap(this.values.map((t=>t.write(e)))),e.token(this.tokens.close),e.token(this.tokens.termination)]),{data:this})}}class Te extends M{static parse(e){const t=e.consumeKind("identifier");if(!t)return;const n={target:t};if(n.includes=e.consume("includes"),n.includes)return n.mixin=e.consumeKind("identifier")||e.error("Incomplete includes statement"),n.termination=e.consume(";")||e.error("No terminating ; for includes statement"),new Te({source:e.source,tokens:n});e.unconsume(t.index)}get type(){return"includes"}get target(){return ie(this.tokens.target.value)}get includes(){return ie(this.tokens.mixin.value)}write(e){return e.ts.definition(e.ts.wrap([this.extAttrs.write(e),e.reference_token(this.tokens.target,this),e.token(this.tokens.includes),e.reference_token(this.tokens.mixin,this),e.token(this.tokens.termination)]),{data:this})}}class Le extends M{static parse(e){const t={},n=ye(new Le({source:e.source,tokens:t}));if(t.base=e.consume("typedef"),t.base)return n.idlType=pe(e,"typedef-type")||e.error("Typedef lacks a type"),t.name=e.consumeKind("identifier")||e.error("Typedef lacks a name"),e.current=n.this,t.termination=e.consume(";")||e.error("Unterminated typedef, expected `;`"),n.this}get type(){return"typedef"}get name(){return ie(this.tokens.name.value)}*validate(e){yield*this.idlType.validate(e)}write(e){return e.ts.definition(e.ts.wrap([this.extAttrs.write(e),e.token(this.tokens.base),e.ts.type(this.idlType.write(e)),e.name_token(this.tokens.name,{data:this}),e.token(this.tokens.termination)]),{data:this})}}class Pe extends M{static parse(e,t){const n={base:t},r=ye(new Pe({source:e.source,tokens:n}));return n.name=e.consumeKind("identifier")||e.error("Callback lacks a name"),e.current=r.this,n.assign=e.consume("=")||e.error("Callback lacks an assignment"),r.idlType=fe(e)||e.error("Callback lacks a return type"),n.open=e.consume("(")||e.error("Callback lacks parentheses for arguments"),r.arguments=de(e),n.close=e.consume(")")||e.error("Unterminated callback"),n.termination=e.consume(";")||e.error("Unterminated callback, expected `;`"),r.this}get type(){return"callback"}get name(){return ie(this.tokens.name.value)}*validate(e){yield*this.extAttrs.validate(e),yield*this.idlType.validate(e)}write(e){return 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{2,}|\\)\n(?!\s*$)/,qt="\\p{P}\\p{S}",zt=mt(/^((?![*_])[\spunctuation])/,"u").replace(/punctuation/g,qt).getRegex(),Ut=mt(/^(?:\*+(?:((?!\*)[punct])|[^\s*]))|^_+(?:((?!_)[punct])|([^\s_]))/,"u").replace(/punct/g,qt).getRegex(),Wt=mt("^[^_*]*?__[^_*]*?\\*[^_*]*?(?=__)|[^*]+(?=[^*])|(?!\\*)[punct](\\*+)(?=[\\s]|$)|[^punct\\s](\\*+)(?!\\*)(?=[punct\\s]|$)|(?!\\*)[punct\\s](\\*+)(?=[^punct\\s])|[\\s](\\*+)(?!\\*)(?=[punct])|(?!\\*)[punct](\\*+)(?!\\*)(?=[punct])|[^punct\\s](\\*+)(?=[^punct\\s])","gu").replace(/punct/g,qt).getRegex(),Ft=mt("^[^_*]*?\\*\\*[^_*]*?_[^_*]*?(?=\\*\\*)|[^_]+(?=[^_])|(?!_)[punct](_+)(?=[\\s]|$)|[^punct\\s](_+)(?!_)(?=[punct\\s]|$)|(?!_)[punct\\s](_+)(?=[^punct\\s])|[\\s](_+)(?!_)(?=[punct])|(?!_)[punct](_+)(?!_)(?=[punct])","gu").replace(/punct/g,qt).getRegex(),Bt=mt(/\\([punct])/,"gu").replace(/punct/g,qt).getRegex(),Ht=mt(/^<(scheme:[^\s\x00-\x1f<>]*|email)>/).replace("scheme",/[a-zA-Z][a-zA-Z0-9+.-]{1,31}/).replace("email",/[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+(@)[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+(?![-_])/).getRegex(),Gt=mt(Tt).replace("(?:--\x3e|$)","--\x3e").getRegex(),Vt=mt("^comment|^</[a-zA-Z][\\w:-]*\\s*>|^<[a-zA-Z][\\w-]*(?:attribute)*?\\s*/?>|^<\\?[\\s\\S]*?\\?>|^<![a-zA-Z]+\\s[\\s\\S]*?>|^<!\\[CDATA\\[[\\s\\S]*?\\]\\]>").replace("comment",Gt).replace("attribute",/\s+[a-zA-Z:_][\w.:-]*(?:\s*=\s*"[^"]*"|\s*=\s*'[^']*'|\s*=\s*[^\s"'=<>`]+)?/).getRegex(),Yt=/(?:\[(?:\\.|[^\[\]\\])*\]|\\.|`[^`]*`|[^\[\]\\`])*?/,Kt=mt(/^!?\[(label)\]\(\s*(href)(?:\s+(title))?\s*\)/).replace("label",Yt).replace("href",/<(?:\\.|[^\n<>\\])+>|[^\s\x00-\x1f]*/).replace("title",/"(?:\\"?|[^"\\])*"|'(?:\\'?|[^'\\])*'|\((?:\\\)?|[^)\\])*\)/).getRegex(),Zt=mt(/^!?\[(label)\]\[(ref)\]/).replace("label",Yt).replace("ref",Ct).getRegex(),Jt=mt(/^!?\[(ref)\](?:\[\])?/).replace("ref",Ct).getRegex(),Qt={_backpedal:bt,anyPunctuation:Bt,autolink:Ht,blockSkip:/\[[^[\]]*?\]\([^\(\)]*?\)|`[^`]*?`|<[^<>]*?>/g,br:Mt,code:/^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,del:bt,emStrongLDelim:Ut,emStrongRDelimAst:Wt,emStrongRDelimUnd:Ft,escape:Ot,link:Kt,nolink:Jt,punctuation:zt,reflink:Zt,reflinkSearch:mt("reflink|nolink(?!\\()","g").replace("reflink",Zt).replace("nolink",Jt).getRegex(),tag:Vt,text:/^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*_]|\b_|$)|[^ ](?= {2,}\n)))/,url:bt},Xt={...Qt,link:mt(/^!?\[(label)\]\((.*?)\)/).replace("label",Yt).getRegex(),reflink:mt(/^!?\[(label)\]\s*\[([^\]]*)\]/).replace("label",Yt).getRegex()},en={...Qt,escape:mt(Ot).replace("])","~|])").getRegex(),url:mt(/^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,"i").replace("email",/[A-Za-z0-9._+-]+(@)[a-zA-Z0-9-_]+(?:\.[a-zA-Z0-9-_]*[a-zA-Z0-9])+(?![-_])/).getRegex(),_backpedal:/(?:[^?!.,:;*_'"~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_'"~)]+(?!$))+/,del:/^(~~?)(?=[^\s~])([\s\S]*?[^\s~])\1(?=[^~]|$)/,text:/^([`~]+|[^`~])(?:(?= {2,}\n)|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@)))/},tn={...en,br:mt(Mt).replace("{2,}","*").getRegex(),text:mt(en.text).replace("\\b_","\\b_| {2,}\\n").replace(/\{2,\}/g,"*").getRegex()},nn={normal:It,gfm:Nt,pedantic:jt},rn={normal:Qt,gfm:en,breaks:tn,pedantic:Xt};class sn{tokens;options;state;tokenizer;inlineQueue;constructor(e){this.tokens=[],this.tokens.links=Object.create(null),this.options=e||rt,this.options.tokenizer=this.options.tokenizer||new $t,this.tokenizer=this.options.tokenizer,this.tokenizer.options=this.options,this.tokenizer.lexer=this,this.inlineQueue=[],this.state={inLink:!1,inRawBlock:!1,top:!0};const t={block:nn.normal,inline:rn.normal};this.options.pedantic?(t.block=nn.pedantic,t.inline=rn.pedantic):this.options.gfm&&(t.block=nn.gfm,this.options.breaks?t.inline=rn.breaks:t.inline=rn.gfm),this.tokenizer.rules=t}static get rules(){return{block:nn,inline:rn}}static lex(e,t){return new sn(t).lex(e)}static lexInline(e,t){return new sn(t).inlineTokens(e)}lex(e){e=e.replace(/\r\n|\r/g,"\n"),this.blockTokens(e,this.tokens);for(let e=0;e<this.inlineQueue.length;e++){const t=this.inlineQueue[e];this.inlineTokens(t.src,t.tokens)}return this.inlineQueue=[],this.tokens}blockTokens(e,t=[]){let n,r,s,o;for(e=this.options.pedantic?e.replace(/\t/g,"    ").replace(/^ +$/gm,""):e.replace(/^( *)(\t+)/gm,((e,t,n)=>t+"    ".repeat(n.length)));e;)if(!(this.options.extensions&&this.options.extensions.block&&this.options.extensions.block.some((r=>!!(n=r.call({lexer:this},e,t))&&(e=e.substring(n.raw.length),t.push(n),!0)))))if(n=this.tokenizer.space(e))e=e.substring(n.raw.length),1===n.raw.length&&t.length>0?t[t.length-1].raw+="\n":t.push(n);else if(n=this.tokenizer.code(e))e=e.substring(n.raw.length),r=t[t.length-1],!r||"paragraph"!==r.type&&"text"!==r.type?t.push(n):(r.raw+="\n"+n.raw,r.text+="\n"+n.text,this.inlineQueue[this.inlineQueue.length-1].src=r.text);else if(n=this.tokenizer.fences(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.heading(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.hr(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.blockquote(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.list(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.html(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.def(e))e=e.substring(n.raw.length),r=t[t.length-1],!r||"paragraph"!==r.type&&"text"!==r.type?this.tokens.links[n.tag]||(this.tokens.links[n.tag]={href:n.href,title:n.title}):(r.raw+="\n"+n.raw,r.text+="\n"+n.raw,this.inlineQueue[this.inlineQueue.length-1].src=r.text);else if(n=this.tokenizer.table(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.lheading(e))e=e.substring(n.raw.length),t.push(n);else{if(s=e,this.options.extensions&&this.options.extensions.startBlock){let t=1/0;const n=e.slice(1);let r;this.options.extensions.startBlock.forEach((e=>{r=e.call({lexer:this},n),"number"==typeof r&&r>=0&&(t=Math.min(t,r))})),t<1/0&&t>=0&&(s=e.substring(0,t+1))}if(this.state.top&&(n=this.tokenizer.paragraph(s)))r=t[t.length-1],o&&"paragraph"===r.type?(r.raw+="\n"+n.raw,r.text+="\n"+n.text,this.inlineQueue.pop(),this.inlineQueue[this.inlineQueue.length-1].src=r.text):t.push(n),o=s.length!==e.length,e=e.substring(n.raw.length);else if(n=this.tokenizer.text(e))e=e.substring(n.raw.length),r=t[t.length-1],r&&"text"===r.type?(r.raw+="\n"+n.raw,r.text+="\n"+n.text,this.inlineQueue.pop(),this.inlineQueue[this.inlineQueue.length-1].src=r.text):t.push(n);else if(e){const t="Infinite loop on byte: "+e.charCodeAt(0);if(this.options.silent){console.error(t);break}throw new Error(t)}}return this.state.top=!0,t}inline(e,t=[]){return this.inlineQueue.push({src:e,tokens:t}),t}inlineTokens(e,t=[]){let n,r,s,o,i,a,c=e;if(this.tokens.links){const e=Object.keys(this.tokens.links);if(e.length>0)for(;null!=(o=this.tokenizer.rules.inline.reflinkSearch.exec(c));)e.includes(o[0].slice(o[0].lastIndexOf("[")+1,-1))&&(c=c.slice(0,o.index)+"["+"a".repeat(o[0].length-2)+"]"+c.slice(this.tokenizer.rules.inline.reflinkSearch.lastIndex))}for(;null!=(o=this.tokenizer.rules.inline.blockSkip.exec(c));)c=c.slice(0,o.index)+"["+"a".repeat(o[0].length-2)+"]"+c.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);for(;null!=(o=this.tokenizer.rules.inline.anyPunctuation.exec(c));)c=c.slice(0,o.index)+"++"+c.slice(this.tokenizer.rules.inline.anyPunctuation.lastIndex);for(;e;)if(i||(a=""),i=!1,!(this.options.extensions&&this.options.extensions.inline&&this.options.extensions.inline.some((r=>!!(n=r.call({lexer:this},e,t))&&(e=e.substring(n.raw.length),t.push(n),!0)))))if(n=this.tokenizer.escape(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.tag(e))e=e.substring(n.raw.length),r=t[t.length-1],r&&"text"===n.type&&"text"===r.type?(r.raw+=n.raw,r.text+=n.text):t.push(n);else if(n=this.tokenizer.link(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.reflink(e,this.tokens.links))e=e.substring(n.raw.length),r=t[t.length-1],r&&"text"===n.type&&"text"===r.type?(r.raw+=n.raw,r.text+=n.text):t.push(n);else if(n=this.tokenizer.emStrong(e,c,a))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.codespan(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.br(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.del(e))e=e.substring(n.raw.length),t.push(n);else if(n=this.tokenizer.autolink(e))e=e.substring(n.raw.length),t.push(n);else if(this.state.inLink||!(n=this.tokenizer.url(e))){if(s=e,this.options.extensions&&this.options.extensions.startInline){let t=1/0;const n=e.slice(1);let r;this.options.extensions.startInline.forEach((e=>{r=e.call({lexer:this},n),"number"==typeof r&&r>=0&&(t=Math.min(t,r))})),t<1/0&&t>=0&&(s=e.substring(0,t+1))}if(n=this.tokenizer.inlineText(s))e=e.substring(n.raw.length),"_"!==n.raw.slice(-1)&&(a=n.raw.slice(-1)),i=!0,r=t[t.length-1],r&&"text"===r.type?(r.raw+=n.raw,r.text+=n.text):t.push(n);else if(e){const t="Infinite loop on byte: "+e.charCodeAt(0);if(this.options.silent){console.error(t);break}throw new Error(t)}}else e=e.substring(n.raw.length),t.push(n);return t}}class on{options;constructor(e){this.options=e||rt}code(e,t,n){const r=(t||"").match(/^\S*/)?.[0];return e=e.replace(/\n$/,"")+"\n",r?'<pre><code class="language-'+dt(r)+'">'+(n?e:dt(e,!0))+"</code></pre>\n":"<pre><code>"+(n?e:dt(e,!0))+"</code></pre>\n"}blockquote(e){return`<blockquote>\n${e}</blockquote>\n`}html(e,t){return e}heading(e,t,n){return`<h${t}>${e}</h${t}>\n`}hr(){return"<hr>\n"}list(e,t,n){const r=t?"ol":"ul";return"<"+r+(t&&1!==n?' start="'+n+'"':"")+">\n"+e+"</"+r+">\n"}listitem(e,t,n){return`<li>${e}</li>\n`}checkbox(e){return"<input "+(e?'checked="" ':"")+'disabled="" type="checkbox">'}paragraph(e){return`<p>${e}</p>\n`}table(e,t){return t&&(t=`<tbody>${t}</tbody>`),"<table>\n<thead>\n"+e+"</thead>\n"+t+"</table>\n"}tablerow(e){return`<tr>\n${e}</tr>\n`}tablecell(e,t){const n=t.header?"th":"td";return(t.align?`<${n} align="${t.align}">`:`<${n}>`)+e+`</${n}>\n`}strong(e){return`<strong>${e}</strong>`}em(e){return`<em>${e}</em>`}codespan(e){return`<code>${e}</code>`}br(){return"<br>"}del(e){return`<del>${e}</del>`}link(e,t,n){const r=gt(e);if(null===r)return n;let s='<a href="'+(e=r)+'"';return t&&(s+=' title="'+t+'"'),s+=">"+n+"</a>",s}image(e,t,n){const r=gt(e);if(null===r)return n;let s=`<img src="${e=r}" alt="${n}"`;return t&&(s+=` title="${t}"`),s+=">",s}text(e){return e}}class an{strong(e){return e}em(e){return e}codespan(e){return e}del(e){return e}html(e){return e}text(e){return e}link(e,t,n){return""+n}image(e,t,n){return""+n}br(){return""}}class cn{options;renderer;textRenderer;constructor(e){this.options=e||rt,this.options.renderer=this.options.renderer||new on,this.renderer=this.options.renderer,this.renderer.options=this.options,this.textRenderer=new an}static parse(e,t){return new cn(t).parse(e)}static parseInline(e,t){return new cn(t).parseInline(e)}parse(e,t=!0){let n="";for(let r=0;r<e.length;r++){const s=e[r];if(this.options.extensions&&this.options.extensions.renderers&&this.options.extensions.renderers[s.type]){const e=s,t=this.options.extensions.renderers[e.type].call({parser:this},e);if(!1!==t||!["space","hr","heading","code","table","blockquote","list","html","paragraph","text"].includes(e.type)){n+=t||"";continue}}switch(s.type){case"space":continue;case"hr":n+=this.renderer.hr();continue;case"heading":{const e=s;n+=this.renderer.heading(this.parseInline(e.tokens),e.depth,ft(this.parseInline(e.tokens,this.textRenderer)));continue}case"code":{const e=s;n+=this.renderer.code(e.text,e.lang,!!e.escaped);continue}case"table":{const e=s;let t="",r="";for(let t=0;t<e.header.length;t++)r+=this.renderer.tablecell(this.parseInline(e.header[t].tokens),{header:!0,align:e.align[t]});t+=this.renderer.tablerow(r);let o="";for(let t=0;t<e.rows.length;t++){const n=e.rows[t];r="";for(let t=0;t<n.length;t++)r+=this.renderer.tablecell(this.parseInline(n[t].tokens),{header:!1,align:e.align[t]});o+=this.renderer.tablerow(r)}n+=this.renderer.table(t,o);continue}case"blockquote":{const e=s,t=this.parse(e.tokens);n+=this.renderer.blockquote(t);continue}case"list":{const e=s,t=e.ordered,r=e.start,o=e.loose;let i="";for(let t=0;t<e.items.length;t++){const n=e.items[t],r=n.checked,s=n.task;let a="";if(n.task){const e=this.renderer.checkbox(!!r);o?n.tokens.length>0&&"paragraph"===n.tokens[0].type?(n.tokens[0].text=e+" "+n.tokens[0].text,n.tokens[0].tokens&&n.tokens[0].tokens.length>0&&"text"===n.tokens[0].tokens[0].type&&(n.tokens[0].tokens[0].text=e+" "+n.tokens[0].tokens[0].text)):n.tokens.unshift({type:"text",text:e+" "}):a+=e+" "}a+=this.parse(n.tokens,o),i+=this.renderer.listitem(a,s,!!r)}n+=this.renderer.list(i,t,r);continue}case"html":{const e=s;n+=this.renderer.html(e.text,e.block);continue}case"paragraph":{const e=s;n+=this.renderer.paragraph(this.parseInline(e.tokens));continue}case"text":{let o=s,i=o.tokens?this.parseInline(o.tokens):o.text;for(;r+1<e.length&&"text"===e[r+1].type;)o=e[++r],i+="\n"+(o.tokens?this.parseInline(o.tokens):o.text);n+=t?this.renderer.paragraph(i):i;continue}default:{const e='Token with "'+s.type+'" type was not found.';if(this.options.silent)return console.error(e),"";throw new Error(e)}}}return n}parseInline(e,t){t=t||this.renderer;let n="";for(let r=0;r<e.length;r++){const s=e[r];if(this.options.extensions&&this.options.extensions.renderers&&this.options.extensions.renderers[s.type]){const e=this.options.extensions.renderers[s.type].call({parser:this},s);if(!1!==e||!["escape","html","link","image","strong","em","codespan","br","del","text"].includes(s.type)){n+=e||"";continue}}switch(s.type){case"escape":{const e=s;n+=t.text(e.text);break}case"html":{const e=s;n+=t.html(e.text);break}case"link":{const e=s;n+=t.link(e.href,e.title,this.parseInline(e.tokens,t));break}case"image":{const e=s;n+=t.image(e.href,e.title,e.text);break}case"strong":{const e=s;n+=t.strong(this.parseInline(e.tokens,t));break}case"em":{const e=s;n+=t.em(this.parseInline(e.tokens,t));break}case"codespan":{const e=s;n+=t.codespan(e.text);break}case"br":n+=t.br();break;case"del":{const e=s;n+=t.del(this.parseInline(e.tokens,t));break}case"text":{const e=s;n+=t.text(e.text);break}default:{const e='Token with "'+s.type+'" type was not found.';if(this.options.silent)return console.error(e),"";throw new Error(e)}}}return n}}class ln{options;constructor(e){this.options=e||rt}static passThroughHooks=new Set(["preprocess","postprocess","processAllTokens"]);preprocess(e){return e}postprocess(e){return e}processAllTokens(e){return e}}const un=new class{defaults={async:!1,breaks:!1,extensions:null,gfm:!0,hooks:null,pedantic:!1,renderer:null,silent:!1,tokenizer:null,walkTokens:null};options=this.setOptions;parse=this.#e(sn.lex,cn.parse);parseInline=this.#e(sn.lexInline,cn.parseInline);Parser=cn;Renderer=on;TextRenderer=an;Lexer=sn;Tokenizer=$t;Hooks=ln;constructor(...e){this.use(...e)}walkTokens(e,t){let n=[];for(const r of e)switch(n=n.concat(t.call(this,r)),r.type){case"table":{const e=r;for(const r of e.header)n=n.concat(this.walkTokens(r.tokens,t));for(const r of e.rows)for(const e of r)n=n.concat(this.walkTokens(e.tokens,t));break}case"list":{const e=r;n=n.concat(this.walkTokens(e.items,t));break}default:{const e=r;this.defaults.extensions?.childTokens?.[e.type]?this.defaults.extensions.childTokens[e.type].forEach((r=>{const s=e[r].flat(1/0);n=n.concat(this.walkTokens(s,t))})):e.tokens&&(n=n.concat(this.walkTokens(e.tokens,t)))}}return n}use(...e){const t=this.defaults.extensions||{renderers:{},childTokens:{}};return e.forEach((e=>{const n={...e};if(n.async=this.defaults.async||n.async||!1,e.extensions&&(e.extensions.forEach((e=>{if(!e.name)throw new Error("extension name required");if("renderer"in e){const n=t.renderers[e.name];t.renderers[e.name]=n?function(...t){let r=e.renderer.apply(this,t);return!1===r&&(r=n.apply(this,t)),r}:e.renderer}if("tokenizer"in e){if(!e.level||"block"!==e.level&&"inline"!==e.level)throw new Error("extension level must be 'block' or 'inline'");const n=t[e.level];n?n.unshift(e.tokenizer):t[e.level]=[e.tokenizer],e.start&&("block"===e.level?t.startBlock?t.startBlock.push(e.start):t.startBlock=[e.start]:"inline"===e.level&&(t.startInline?t.startInline.push(e.start):t.startInline=[e.start]))}"childTokens"in e&&e.childTokens&&(t.childTokens[e.name]=e.childTokens)})),n.extensions=t),e.renderer){const t=this.defaults.renderer||new on(this.defaults);for(const n in e.renderer){if(!(n in t))throw new Error(`renderer '${n}' does not exist`);if("options"===n)continue;const r=n,s=e.renderer[r],o=t[r];t[r]=(...e)=>{let n=s.apply(t,e);return!1===n&&(n=o.apply(t,e)),n||""}}n.renderer=t}if(e.tokenizer){const t=this.defaults.tokenizer||new $t(this.defaults);for(const n in e.tokenizer){if(!(n in t))throw new Error(`tokenizer '${n}' does not exist`);if(["options","rules","lexer"].includes(n))continue;const r=n,s=e.tokenizer[r],o=t[r];t[r]=(...e)=>{let n=s.apply(t,e);return!1===n&&(n=o.apply(t,e)),n}}n.tokenizer=t}if(e.hooks){const 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e=t.dataset.cite,n=Ka(t),r=await Ba(n);if(r)Ha(t,r,n);else{const n=`Couldn't find a match for "${e}"`;t.dataset.matchedText&&(t.textContent=t.dataset.matchedText),ir(n,Wa,{elements:[t]})}}o("beforesave",Za)},toCiteDetails:Ka});const Qa="core/link-to-dfn",Xa=[],ec={en:{duplicateMsg:e=>`Duplicate definition(s) of '${e}'`,duplicateTitle:"This is defined more than once in the document."},ja:{duplicateMsg:e=>`'${e}' の重複定義`,duplicateTitle:"この文書内で複数回定義されています．"},de:{duplicateMsg:e=>`Mehrfache Definition von '${e}'`,duplicateTitle:"Das Dokument enthält mehrere Definitionen dieses Eintrags."},zh:{duplicateMsg:e=>`'${e}' 的重复定义`,duplicateTitle:"在文档中有重复的定义。"}},tc=On(ec);function nc(e){const t=new Map,n=[];for(const r of Gi.get(e)){const{dfnType:s="dfn"}=r.dataset,o=r.dataset.dfnFor?.split(",").map((e=>e.trim()))??[""];for(const i of o){if(t.has(i)&&t.get(i).has(s)){const e=t.get(i).get(s),o="dfn"===e.localName,a="dfn"===r.localName,c=s===(e.dataset.dfnType||"dfn"),l=!i&&!e.dataset.dfnFor||e.dataset.dfnFor?.split(",").map((e=>e.trim())).includes(i);if(o&&a&&c&&l){n.push(r);continue}}t.has(i)||t.set(i,new Map),t.get(i).set(s,r),("idl"in r.dataset||"dfn"!==s)&&t.get(i).set("idl",r),Hn(r,"dfn",e)}}return{result:t,duplicates:n}}function rc(e,t){const n=function(e){const t=e.closest("[data-link-for]"),n=t?t.dataset.linkFor:"",r=Gn(e).reduce(((e,r)=>{const s=r.split(".");return 2===s.length&&e.push({for:s[0],title:s[1]}),e.push({for:n,title:r}),t||e.push({for:r,title:r}),""!==n&&e.push({for:"",title:r}),e}),[]);return r}(e),r=n.find((e=>t.has(e.title)&&t.get(e.title).has(e.for)));if(!r)return;const s=t.get(r.title).get(r.for),{linkType:o}=e.dataset;if(o){for(const e of o.split("|"))if(s.get(e))return s.get(e);return s.get("dfn")}{const e=r.for?"idl":"dfn";return s.get(e)||s.get("idl")}}function sc(e,t,n){let r=!1;const{linkFor:s}=e.dataset,{dfnFor:o}=t.dataset;if(t.dataset.cite)e.dataset.cite=t.dataset.cite;else if(s&&!n.get(s)&&o&&!o.split(",").map((e=>e.trim())).includes(s))r=!0;else if(t.classList.contains("externalDFN")){const n=t.dataset.lt?t.dataset.lt.split("|"):[];e.dataset.lt=n[0]||t.textContent,r=!0}else"partial"!==e.dataset.idl?(e.href=`#${t.id}`,e.classList.add("internalDFN")):r=!0;return e.hasAttribute("data-link-type")||(e.dataset.linkType="idl"in t.dataset?"idl":"dfn"),function(e){if(e.closest("code,pre"))return!0;if(1!==e.childNodes.length)return!1;const[t]=e.childNodes;return"code"===t.localName}(t)&&function(e,t){const n=e.textContent.trim(),r=t.dataset.hasOwnProperty("idl"),s=oc(e)&&oc(t,n);r&&!s||Kn(e,document.createElement("code"))}(e,t),!r}function oc(e,t=""){if("a"===e.localName){if(!e.querySelector("code"))return!0}else{const{dataset:n}=e;if(e.textContent.trim()===t)return!0;if(n.title===t)return!0;if(n.lt||n.localLt){const e=[];return n.lt&&e.push(...n.lt.split("|")),n.localLt&&e.push(...n.localLt.split("|")),e.includes(t)}}return!1}function ic(e){e.forEach((e=>{ir(`Found linkless \`<a>\` element with text "${e.textContent}" but no matching \`<dfn>\``,Qa,{title:"Linking error: not matching `<dfn>`",elements:[e]})}))}var ac=Object.freeze({__proto__:null,name:Qa,possibleExternalLinks:Xa,run:async function(e){const t=function(){const e=new rr;for(const t of Gi.keys()){const{result:n,duplicates:r}=nc(t);e.set(t,n),r.length>0&&or(tc.duplicateMsg(t),Qa,{title:tc.duplicateTitle,elements:r})}return e}(),n=[],r=document.querySelectorAll("a[data-cite=''], a:not([href]):not([data-cite]):not(.logo):not(.externalDFN)");for(const e of r){if(!e.dataset?.linkType&&e.dataset?.xrefType){Xa.push(e);continue}const r=rc(e,t);if(r){sc(e,r,t)||Xa.push(e)}else""===e.dataset.cite?n.push(e):Xa.push(e)}ic(n),function(e){const{shortName:t=""}=e,n=new RegExp(String.raw`^([?!])?${t}\b([^-])`,"i"),r=document.querySelectorAll("dfn[data-cite]:not([data-cite='']), a[data-cite]:not([data-cite=''])");for(const t of r){t.dataset.cite=t.dataset.cite.replace(n,`$1${Fa}$2`);const{key:r,isNormative:s}=Ka(t);r!==Fa&&(s||e.normativeReferences.has(r)?(e.normativeReferences.add(r),e.informativeReferences.delete(r)):e.informativeReferences.add(r))}}(e),e.xref||ic(Xa)}});const cc="xrefs",lc=3e5;async function uc(){return await yn.openDB("xref",2,{upgrade(e){[...e.objectStoreNames].forEach((t=>e.deleteObjectStore(t)));e.createObjectStore(cc,{keyPath:"query.id"}).createIndex("byTerm","query.term",{unique:!1})}})}async function dc(e){const t=new Map;if(await async function(){const e="XREF:LAST_VERSION_CHECK",t=parseInt(localStorage.getItem(e),10),n=Date.now();if(!t)return localStorage.setItem(e,n.toString()),!1;if(n-t<lc)return!1;const r=new URL("meta/version",hc).href,s=await fetch(r);if(!s.ok)return!1;const o=await s.text();return localStorage.setItem(e,n.toString()),parseInt(o,10)>t}())return await async function(){try{await uc().then((e=>e.clear(cc)))}catch(e){console.error(e)}}(),t;const n=new Set(e.map((e=>e.id)));try{const e=await uc();let r=await e.transaction(cc).store.openCursor();for(;r;)n.has(r.key)&&t.set(r.key,r.value.result),r=await r.continue()}catch(e){console.error(e)}return t}const pc="core/xref",fc={"web-platform":["HTML","INFRA","URL","WEBIDL","DOM","FETCH"]},hc="https://respec.org/xref/",mc=[];if(!document.querySelector("link[rel='preconnect'][href='https://respec.org']")){const e=En({hint:"preconnect",href:"https://respec.org"});document.head.appendChild(e)}function gc(e){const t="xrefType"in e.dataset;let n=bc(e);t||(n=n.toLowerCase());const r=function(e){const t=[];let n=e.closest("[data-cite]");for(;n;){const r=n.dataset.cite.toLowerCase().replace(/[!?]/g,"").split(/\s+/).filter((e=>e));if(r.length&&t.push(r),n===e)break;n=n.parentElement.closest("[data-cite]")}if(n!==e){const n=e.closest("section"),r=[...n?n.querySelectorAll("a.bibref"):[]].map((e=>e.textContent.toLowerCase()));r.length&&t.push(r)}const r=function(e){const t=[];for(const n of e){const e=t[t.length-1]||[],r=[...new Set(n)].filter((t=>!e.includes(t)));t.push(r.sort())}return t}(t);return r}(e),s=function(e,t){if(t)return e.dataset.xrefType?e.dataset.xrefType.split("|"):["_IDL_"];return["_CONCEPT_"]}(e,t),o=function(e,t){if(e.dataset.xrefFor)return jn(e.dataset.xrefFor);if(t){const t=e.closest("[data-xref-for]");if(t)return jn(t.dataset.xrefFor)}return null}(e,t);return{id:"",term:n,types:s,...r.length&&{specs:r},..."string"==typeof o&&{for:o}}}function bc(e){const{lt:t}=e.dataset;let n=t?t.split("|",1)[0]:e.textContent;return n=jn(n),"the-empty-string"===n?"":n}function yc(e,t,n,r){const{term:s,specs:o=[]}=t,{uri:i,shortname:a,spec:c,normative:l,type:u,for:d}=n,p=o.flat().includes(c)?c:a,f=new URL(i,"https://partial");let{pathname:h}=f;"/"===h&&(h="");const m={cite:p,citePath:h,citeFrag:f.hash.slice(1),type:u};d&&(m.linkFor=d[0]),f.origin&&"https://partial"!==f.origin&&(m.citeHref=f.href),Object.assign(e.dataset,m),function(e,t,n,r,s){const o=function(e){const t=e.closest(".normative"),n=e.closest(Rn);return!n||e===t||t&&n&&n.contains(t)}(e);if(!o)return void(s.normativeReferences.has(t)||s.informativeReferences.add(t));if(n){const e=s.informativeReferences.has(t)?s.informativeReferences.getCanonicalKey(t):t;return s.normativeReferences.add(e),void s.informativeReferences.delete(e)}mc.push({term:r,spec:t,element:e})}(e,p,l,s,r)}function wc(e){const t=JSON.stringify(e,Object.keys(e).sort()),n=(new TextEncoder).encode(t);return crypto.subtle.digest("SHA-1",n).then(vc)}function vc(e){return[...new Uint8Array(e)].map((e=>e.toString(16).padStart(2,"0"))).join("")}function $c(e){const t=e.querySelectorAll("a[data-xref-for], a[data-xref-type], a[data-link-for]"),n=["data-xref-for","data-xref-type","data-link-for"];t.forEach((e=>{n.forEach((t=>e.removeAttribute(t)))}))}var kc=Object.freeze({__proto__:null,API_URL:hc,getTermFromElement:bc,informativeRefsInNormative:mc,name:pc,run:async function(e){if(!e.xref)return;const t=function(e){const t={url:new URL("search/",hc).href,specs:null},n=Object.assign({},t);switch(Array.isArray(e)?"array":typeof e){case"boolean":break;case"string":e.toLowerCase()in fc?Object.assign(n,{specs:fc[e.toLowerCase()]}):r(e);break;case"array":Object.assign(n,{specs:e});break;case"object":if(Object.assign(n,e),e.profile){const t=e.profile.toLowerCase();if(t in fc){const r=(e.specs??[]).concat(fc[t]);Object.assign(n,{specs:r})}else r(e.profile)}break;default:or(`Invalid value for \`xref\` configuration option. Received: "${e}".`,pc)}return n;function r(e){or(`Invalid profile "${e}" in \`respecConfig.xref\`. Please use one of the supported profiles: ${Dn(Object.keys(fc),(e=>`"${e}"`))}.`,pc)}}(e.xref);if(t.specs){const e=document.body.dataset.cite?document.body.dataset.cite.split(/\s+/):[];document.body.dataset.cite=e.concat(t.specs).join(" ")}const n=Xa.concat(function(){const e=document.querySelectorAll(":is(a,dfn)[data-cite]:not([data-cite=''],[data-cite*='#'])"),t=document.querySelectorAll("dfn.externalDFN");return[...e].filter((e=>{if(""===e.textContent.trim())return!1;const t=e.closest("[data-cite]");return!t||""!==t.dataset.cite})).concat(...t)}());if(!n.length)return;const r=[];for(const e of n){const t=gc(e);t.id=await wc(t),r.push(t)}const s=await async function(e,t){const n=new Set,r=e.filter((e=>!n.has(e.id)&&(n.add(e.id)&&!0))),s=await dc(r),o=r.filter((e=>!s.get(e.id))),i=await async function(e,t){if(!e.length)return new Map;const n={method:"POST",body:JSON.stringify({queries:e}),headers:{"Content-Type":"application/json"}},r=await fetch(t,n),s=await r.json();return new Map(s.results.map((({id:e,result:t})=>[e,t])))}(o,t);i.size&&await async function(e,t){try{const n=(await uc()).transaction(cc,"readwrite");for(const r of e){const e=t.get(r.id);n.objectStore(cc).add({query:r,result:e})}await n.done}catch(e){console.error(e)}}(r,i);return new Map([...s,...i])}(r,t.url);!function(e,t,n,r){const s={ambiguous:new Map,notFound:new Map};for(let o=0,i=e.length;o<i;o++){if(e[o].closest("[data-no-xref]"))continue;const i=e[o],a=t[o],{id:c}=a,l=n.get(c);if(1===l.length)yc(i,a,l[0],r);else{const e=s[0===l.length?"notFound":"ambiguous"];e.has(c)||e.set(c,{elems:[],results:l,query:a}),e.get(c).elems.push(i)}}!function({ambiguous:e,notFound:t}){const n=(e,t,n=[])=>{const r=new URL(hc);return r.searchParams.set("term",e),t.for&&r.searchParams.set("for",t.for),r.searchParams.set("types",t.types.join(",")),n.length&&r.searchParams.set("specs",n.join(",")),r.href},r=(e,t)=>pr`[See search matches for "${t}"](${e}) or ${"[Learn about this error|#error-term-not-found]"}.`;for(const{query:e,elems:s}of t.values()){const t=e.specs?[...new Set(e.specs.flat())].sort():[],o=bc(s[0]),i=n(o,e),a=In(t,(e=>`**[${e}]**`)),c=r(i,o);or(`Couldn't find "**${o}**"${e.for?`, for **"${e.for}"**, `:""} in this document or other cited documents: ${a}.`,pc,{title:"No matching definition found.",elements:s,hint:c})}for(const{query:t,elems:s,results:o}of e.values()){const e=[...new Set(o.map((e=>e.shortname)))].sort(),i=In(e,(e=>`**[${e}]**`)),a=bc(s[0]),c=n(a,t,e),l=t.for?`, for **"${t.for}"**, `:"",u=r(c,a),d=pr`To fix, use the ${"[data-cite]"} attribute to pick the one you mean from the appropriate specification.`+String.raw` ${u}`;or(`The term "**${a}**"${l} is ambiguous because it's defined in ${i}.`,pc,{title:"Definition is ambiguous.",elements:s,hint:d})}}(s)}(n,r,s,e),o("beforesave",$c)}});var xc=String.raw`ul.index{columns:30ch;column-gap:1.5em}
 ul.index li{list-style:inherit}
 ul.index li span{color:inherit;cursor:pointer;white-space:normal}
 #index-defined-here ul.index li{font-size:.9rem}
diff --git a/tools/check-rec-amendment.js b/tools/check-rec-amendment.js
index 826f03280..c8d1ffb84 100644
--- a/tools/check-rec-amendment.js
+++ b/tools/check-rec-amendment.js
@@ -10,10 +10,10 @@ module.exports = async ({github, context, core}) => {
   }
   const amendments = require(process.env.GITHUB_WORKSPACE + '/amendments.json');
   const prAmendmentSection = Object.values(amendments).find(list => list.find(a => Array.isArray(a.pr) ? a.pr.includes(context.issue.number) : a.pr === context.issue.number ));
-  const prAmendment = prAmendmentSection.find(a => Array.isArray(a.pr) ? a.pr.includes(context.issue.number) : a.pr === context.issue.number );
-  if (!prAmendment) {
+  if (!prAmendmentSection) {
     core.setFailed(`Pull request ${context.issue.number} not labeled as editorial and not referenced in amendments.json`);
   }
+  const prAmendment = prAmendmentSection.find(a => Array.isArray(a.pr) ? a.pr.includes(context.issue.number) : a.pr === context.issue.number );
   if (!prAmendment.testUpdates || !prAmendment.testUpdates.length === 0) {
     core.setFailed(`Pull request ${context.issue.number} declares an amendment but does not document its test status in testUpdates`);
   }
diff --git a/webrtc.css b/webrtc.css
index c43f126c7..8c3ca6d3f 100644
--- a/webrtc.css
+++ b/webrtc.css
@@ -18,8 +18,6 @@ table td, table th { border-left: solid; border-right: solid; border-bottom: sol
 
 ins { background: green; color: white; /* color: green; border: solid thin lime; padding: 0.3em; line-height: 1.6em; */ text-decoration: none; }
 del { background: maroon; color: white; /* color: maroon; border: solid thin red; padding: 0.3em; line-height: 1.6em; */ text-decoration: line-through; }
-body ins, body del { display: block; }
-body * ins, body * del { display: inline; }
 
 
 .note { color: green; background: transparent; font-family: sans-serif, Droid Sans Fallback; }
@@ -58,16 +56,9 @@ body.testcoverage .untestable { opacity: 0.5;}
 body.testcoverage .issue, body.testcoverage .example, body.testcoverage .note, body.testcoverage .informative, body.testcoverage .appendix { display: none;}
 
 /* CSS for amendments markup */
-
-.diff-new, .diff-old { position: relative; margin-top: 0.8em;}
-.diff-new { border: thick solid #5a5;}
-.diff-old { border: thick solid #F55;}
 .diff-rm { display: none; }
+.diff-rm:has(del) { display: initial;}
 
-.diff-old::before, .diff-new::before { position: absolute; top: -1.5em; font-size: 0.8em; right: 0; margin-right: 0; content: attr(aria-label)}
-
-.diff-old::before { color: var(--del-text);}
-.diff-new::before { color: var(--ins-text);}
 
 section ol {
     counter-reset: list;
@@ -85,6 +76,3 @@ section ol > li.skip::before {
     counter-increment: list 0;
     content: "";
 }
-
-del:not(#dontusethisid) .simple th  { color: #Faa;}
-ins:not(#dontusethisid) .simple th  { color: #aFa;}
diff --git a/webrtc.html b/webrtc.html
index 97982864d..49d2f6a47 100644
--- a/webrtc.html
+++ b/webrtc.html
@@ -11,6 +11,7 @@
     </script>
     <script class="remove" src="testable-assertions.js">
     </script>
+    <script class="remove" src="js/diff/specdiff.js"></script>
     <script class="remove" src="amendments.js">
     </script>
     <script class="remove" src="webrtc.js">
@@ -869,7 +870,7 @@ <h4>
                 </tr>
               </tbody>
             </table>
-            <p>
+            <p id="rtcicegatheringstate-transports">
               The set of transports considered is the one
               presently referenced by the {{RTCPeerConnection}}'s
               [= set of transceivers =] and the {{RTCPeerConnection}}'s
@@ -1100,7 +1101,7 @@ <h4>
                 </tr>
               </tbody>
             </table>
-          <p>
+          <p id="rtciceconnectionstate-transports">
             The set of transports considered is the one
             presently referenced by the {{RTCPeerConnection}}'s
             [= set of transceivers =] and the {{RTCPeerConnection}}'s
@@ -1573,13 +1574,13 @@ <h4>
               the user agent MUST queue a task that runs the following steps:
             </p>
             <ol class=algorithm data-tests="RTCPeerConnection-connectionState.https.html">
-              <li class="no-test-needed" id="connectionstate-algo">
+              <li class="no-test-needed">
                 <p>
                   Let <var>connection</var> be this {{RTCPeerConnection}}
                   object associated with the {{RTCDtlsTransport}} object whose state changed.
                 </p>
               </li>
-              <li class="add-to-connectionstate-algo">
+              <li id="connectionstate-closed">
                 <p>
                   If <var>connection</var>.{{RTCPeerConnection/[[IsClosed]]}} is
                   <code>true</code>, abort these steps.
@@ -1673,7 +1674,7 @@ <h4>
                   with these additional restrictions:
                 </p>
                 <ol>
-                  <li id="apply-description-restrictions">
+                  <li>
                     <p>
                       Use <var>jsepSetOfTransceivers</var> as the source of
                       truth with regard to what "RtpTransceivers" exist, and
@@ -1681,7 +1682,7 @@ <h4>
                       property".
                     </p>
                   </li>
-                  <li class="add-to-apply-description-restrictions">
+                  <li id="apply-prohibited-gathering-1">
                     <p>If <var>remote</var> is <code>false</code> and this
                     triggers the ICE candidate gathering process in <span data-jsep=
                      "applying-a-local-desc">[[!RFC9429]]</span>, the [= ICE Agent =]
@@ -1689,7 +1690,7 @@ <h4>
                     [= administratively prohibited =].
                     </p>
                   </li>
-                  <li class="add-to-apply-description-restrictions">
+                  <li  id="apply-prohibited-gathering-2">
                     <p>If <var>remote</var> is <code>true</code> and this
                     triggers ICE connectivity checks in <span data-jsep=
                      "applying-a-remote-desc">[[!RFC9429]]</span>, the
@@ -1705,7 +1706,7 @@ <h4>
                       it were in stable state.
                     </p>
                   </li>
-                  <li id="remote-rid-reneg" class="diff-rm"><!-- kept for candidate amendment management --></li>
+                  <li id="remote-rid-reneg" class="diff-rm">&nbsp;<!-- kept for candidate amendment management --></li>
                   <li>
                     <p>
                       If the process to apply <var>description</var> fails for
@@ -1822,7 +1823,7 @@ <h4>
                           <var>transceiver</var> in <var>connection</var>'s [=
                           set of transceivers =], run the following steps:
                         </p>
-                        <ol id="set-last-stable-offer-properties">
+                        <ol>
                           <li>
                             <p>
                               Set
@@ -1831,7 +1832,7 @@ <h4>
                               <var>transceiver</var>.{{RTCRtpTransceiver/[[Sender]]}}.{{RTCRtpSender/[[SenderTransport]]}}.
                             </p>
                           </li>
-                          <li class="add-to-set-last-stable-offer-properties">
+                          <li id="rollback-ridless">
                             <p>
                               If
                               <var>transceiver</var>.{{RTCRtpTransceiver/[[Sender]]}}.{{RTCRtpSender/[[SendEncodings]]}}.length
@@ -2649,7 +2650,7 @@ <h4>
                               <var>connection</var>'s [= set of transceivers =]
                               run the following steps:
                             </p>
-                            <ol id="set-rollback-per-transceiver">
+                            <ol>
                               <li>
                                 <p>
                                   If <var>transceiver</var> was not [=
@@ -2669,7 +2670,7 @@ <h4>
                                   <var>transceiver</var>.{{RTCRtpTransceiver/[[Sender]]}}.{{RTCRtpSender/[[LastStableStateSenderTransport]]}}.
                                 </p>
                               </li>
-                              <li class="add-to-set-rollback-per-transceiver">
+                              <li id="rollback-ridless-2">
                                 <p>
                                   If
                                   <var>transceiver</var>.{{RTCRtpTransceiver/[[Sender]]}}.{{RTCRtpSender/[[LastStableRidlessSendEncodings]]}}
@@ -2796,7 +2797,7 @@ <h4>
                           steps:
                         </p>
                         <ol>
-                          <li id="stable-signaling-1">
+                          <li>
                             <p class="needs-test">
                               For any <var>transceiver</var> that was removed
                               from the [= set of transceivers =] in a previous
@@ -2811,7 +2812,7 @@ <h4>
                               firing on these objects in a queued task.
                             </p>
                           </li>
-                          <li class="add-to-stable-signaling-1">
+                          <li id="init-rtcrtpencodingparameters-codec">
                             <p>For each <var>transceiver</var> in <var>connection</var>'s [= set of transceivers =]:</p>
                             <ol>
                               <li>
@@ -2916,7 +2917,7 @@ <h4>
               </li>
             </ol>
           </section>
-          <section>
+          <section id="set-the-configuration">
             <h4>
               Set the configuration
             </h4>
@@ -6139,7 +6140,8 @@ <h2>
                 Most attributes below are defined in section 15.1 of [[RFC5245]].
               </p>
               <dl data-link-for="RTCIceCandidate" data-dfn-for=
-              "RTCIceCandidate" class="attributes"  id="rtcicecandidate-attributes">
+		  "RTCIceCandidate" class="attributes"  id="rtcicecandidate-attributes">
+		<div>
                 <dt data-tests="">
                   <dfn data-idl="">candidate</dfn> of type <span class=
                   "idlAttrType">DOMString</span>, readonly
@@ -6150,6 +6152,8 @@ <h2>
                   represents an end-of-candidates indication or a peer
                   reflexive remote candidate, {{candidate}} is an empty string.
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="">
                   <dfn data-idl="">sdpMid</dfn> of type <span class=
                   "idlAttrType">DOMString</span>, readonly, nullable
@@ -6159,6 +6163,8 @@ <h2>
                   "identification-tag"</dfn> defined in [[!RFC5888]] for the
                   media component this candidate is associated with.
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="">
                   <dfn data-idl="">sdpMLineIndex</dfn> of type <span class=
                   "idlAttrType">unsigned short</span>, readonly, nullable
@@ -6168,6 +6174,8 @@ <h2>
                   at zero) of the [= media description =] in the SDP this
                   candidate is associated with.
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="RTCIceCandidate-constructor.html">
                   <dfn data-idl="">foundation</dfn> of type <span class=
                   "idlAttrType">DOMString</span>, readonly, nullable
@@ -6176,6 +6184,8 @@ <h2>
                   A unique identifier that allows ICE to correlate candidates
                   that appear on multiple {{RTCIceTransport}}s.
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="RTCIceCandidate-constructor.html">
                   <dfn data-idl="">component</dfn> of type <span class=
                   "idlAttrType">{{RTCIceComponent}}</span>, readonly, nullable
@@ -6187,6 +6197,8 @@ <h2>
                   field in [= candidate-attribute =], decoded to the string
                   representation as defined in {{RTCIceComponent}}.
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="RTCIceCandidate-constructor.html">
                   <dfn data-idl="">priority</dfn> of type <span class=
                   "idlAttrType">unsigned long</span>, readonly, nullable
@@ -6194,6 +6206,8 @@ <h2>
                 <dd>
                   The assigned priority of the candidate.
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="RTCIceCandidate-constructor.html">
                   <dfn data-idl="">address</dfn> of type <span class=
                   "idlAttrType">DOMString</span>, readonly, nullable
@@ -6257,6 +6271,8 @@ <h2>
                     </p>
                   </div>
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="RTCIceCandidate-constructor.html">
                   <dfn data-idl="">protocol</dfn> of type <span class=
                   "idlAttrType">{{RTCIceProtocol}}</span>, readonly, nullable
@@ -6267,6 +6283,8 @@ <h2>
                   corresponds to the <code class="ice">transport</code> field
                   in [= candidate-attribute =].
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="RTCIceCandidate-constructor.html">
                   <dfn data-idl="">port</dfn> of type <span class=
                   "idlAttrType">unsigned short</span>, readonly, nullable
@@ -6274,6 +6292,8 @@ <h2>
                 <dd>
                   The port of the candidate.
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="RTCIceCandidate-constructor.html">
                   <dfn data-idl="">type</dfn> of type <span class=
                   "idlAttrType">{{RTCIceCandidateType}}</span>, readonly,
@@ -6283,6 +6303,8 @@ <h2>
                   The type of the candidate. This corresponds to the
                   <code class="ice">candidate-types</code> field in [=
                   candidate-attribute =].
+		</div>
+		<div>
                 </dd>
                 <dt data-tests="RTCIceCandidate-constructor.html">
                   <dfn data-idl="">tcpType</dfn> of type <span class=
@@ -6295,6 +6317,8 @@ <h2>
                   is <code>null</code>. This corresponds to the <code class=
                   "ice">tcp-type</code> field in [= candidate-attribute =].
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="RTCIceCandidate-constructor.html">
                   <dfn>relatedAddress</dfn> of type <span class=
                   "idlAttrType">DOMString</span>, readonly, nullable
@@ -6307,6 +6331,8 @@ <h2>
                   corresponds to the <code class="ice">rel-address</code> field
                   in [= candidate-attribute =].
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="RTCIceCandidate-constructor.html">
                   <dfn>relatedPort</dfn> of type <span class=
                   "idlAttrType">unsigned short</span>, readonly, nullable
@@ -6319,33 +6345,40 @@ <h2>
                   the <code class="ice">rel-port</code> field in [=
                   candidate-attribute =].
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="">
                   <dfn>usernameFragment</dfn> of type <span class=
                   "idlAttrType">DOMString</span>, readonly, nullable
                 </dt>
-                <dd id="usernameFragment-desc">
+                <dd>
                   This carries the <code class="ice">ufrag</code> as defined in
                   section 15.4 of [[RFC5245]].
                 </dd>
-                <dt class="add-to-usernameFragment-desc">
+		</div>
+		<div id="rtcicecandidate-relayprotocol">
+                <dt>
                   <dfn>relayProtocol</dfn> of type <span class=
                   "idlMemberType">RTCIceServerTransportProtocol</span>, readonly, nullable
                 </dt>
-                <dd class="add-to-usernameFragment-desc">
+                <dd>
                   For local candidates of type {{RTCIceCandidateType/"relay"}} this is the
                   protocol used by the endpoint to communicate with the TURN server. For
                   all other candidates it is `null`.
                 </dd>
-                <dt class="add-to-usernameFragment-desc">
+		</div>
+		<div id="rtcicecandidate-url">
+                <dt>
                   <dfn>url</dfn> of type <span class=
                   "idlMemberType">DOMString</span>, readonly, nullable
                 </dt>
-                <dd class="add-to-usernameFragment-desc">
+                <dd>
                   For local candidates of type {{RTCIceCandidateType/"srflx"}} or type
                   {{RTCIceCandidateType/"relay"}} this is the URL of the ICE server
                   from which the candidate was obtained. For all other candidates it is
                   `null`.
                 </dd>
+		</div>
               </dl>
             </section>
             <section>
@@ -6629,7 +6662,7 @@ <h4>
               </table>
             </div>
           </section>
-          <section class="add-to-rtcicecandidatetype-enum">
+          <section id="rtciceservertransportprotocol-enum">
             <h4>
               <dfn>RTCIceServerTransportProtocol</dfn> Enum
             </h4>
@@ -6790,7 +6823,7 @@ <h2>
                   <dfn data-idl="">url</dfn> of type <span class=
                   "idlAttrType">DOMString</span>, readonly, nullable
                 </dt>
-                <dd id="rtcpeerconnectioniceevent-url-desc">
+                <dd>
                   <p>
                     The {{url}} attribute is the STUN or TURN URL that
                     identifies the STUN or TURN server used to gather this
@@ -6798,7 +6831,7 @@ <h2>
                     TURN server, this parameter will be set to
                     <code>null</code>.
                   </p>
-                  <p class="note add-to-rtcpeerconnectioniceevent-url-desc">
+                  <p id="rtcpeerconnectioniceevent-url-deprecation">
                     This attribute is deprecated; it exists for legacy compatibility reasons only.
                     Prefer the candidate {{RTCIceCandidate/url}}.
                   </p>
@@ -7305,7 +7338,7 @@ <h2>
             </dl>
           </section>
         </div>
-        <section>
+        <section id="rtccertificateexpiration-dictionary">
           <h2>
             <dfn>RTCCertificateExpiration</dfn> Dictionary
           </h2>
@@ -7335,7 +7368,7 @@ <h2>
             </dd>
           </dl>
         </section>
-        <section>
+        <section id="rtccertificate-interface">
           <h2>
             <dfn>RTCCertificate</dfn> Interface
           </h2>
@@ -9748,14 +9781,15 @@ <h2>
                 Dictionary {{RTCRtpEncodingParameters}} Members
               </h2>
               <dl data-link-for="RTCRtpEncodingParameters" data-dfn-for=
-              "RTCRtpEncodingParameters" class="dictionary-members">
+		  "RTCRtpEncodingParameters" class="dictionary-members">
+		<div>
                 <dt data-tests=
                 "RTCPeerConnection-transceivers.https.html,RTCRtpParameters-encodings.html">
                   <dfn data-idl="">active</dfn> of type <span class=
                   "idlMemberType">boolean</span>, defaulting to
                   <code>true</code>
                 </dt>
-                <dd id="rtcrtpencodingparamters-attributes-active">
+                <dd>
                   <p>
                     Indicates that this encoding is actively being sent.
                     Setting it to <code>false</code> causes this encoding to no
@@ -9765,14 +9799,18 @@ <h2>
                     an RTCP BYE is not sent.
                   </p>
                 </dd>
-                <dt class="add-to-rtcrtpencodingparamters-attributes-active"
+		</div>
+		<div id="rtcrtpparameters-codec">
+                <dt
 		    data-tests="RTCRtpParameters-codec.html">
                   <dfn data-idl>codec</dfn> of type <span class="idlMemberType">RTCRtpCodec</span>
                 </dt>
-                <dd class="add-to-rtcrtpencodingparamters-attributes-active">
+                <dd>
                   <p>Optional value selecting which codec is used for this encoding's
                     RTP stream. If absent, the user agent can chose to use any negotiated codec.</p>
                 </dd>
+		</div>
+		<div>
                 <!-- Could add test to validate it does what it says it does with very low values and high values, and check stats-->
                 <dt data-tests="RTCRtpParameters-encodings.html">
                   <dfn data-idl="">maxBitrate</dfn> of type <span class=
@@ -9803,6 +9841,8 @@ <h2>
                     bandwidth to be sent.
                   </p>
                 </dd>
+		</div>
+		<div>
                 <dt data-tests="RTCRtpParameters-encodings.html">
                   <dfn data-idl>maxFramerate</dfn> of type <span class=
                   "idlMemberType">double</span>
@@ -9821,6 +9861,8 @@ <h2>
                     frame.
                   </p>
                 </dd>
+		</div>
+		<div>
                 <!-- Could add test to validate it does what it says it does -->
                 <dt data-tests="RTCRtpParameters-encodings.html">
                   <dfn data-idl="">scaleResolutionDownBy</dfn> of type
@@ -9844,6 +9886,7 @@ <h2>
                     1.0).
                   </p>
                 </dd>
+		</div>
               </dl>
             </section>
           </div>
@@ -10158,7 +10201,7 @@ <h2>
             </section>
           </div>
         </section>
-        <section class="add-to-rtcrtpheaderextensioncapability">
+        <section id="rtcsetparameteroptions-dictionary">
           <h3>
             <dfn>RTCSetParameterOptions</dfn> Dictionary
           </h3>
@@ -10274,14 +10317,14 @@ <h3>
               set in an implementation defined manner.
             </p>
           </li>
-          <li id="rtcrtpreceiver-laststablestatereceivecodecs">
+          <li>
             <p>
               Let <var>receiver</var> have a
               <dfn data-dfn-for="RTCRtpReceiver">[[\LastStableStateReceiveCodecs]]</dfn> internal slot and
               initialize it to an empty list.
             </p>
           </li>
-          <li class="add-to-rtcrtpreceiver-laststablestatereceivecodecs" data-test="webrtc/RTCRtpReceiver-jitterBufferTarget.html">
+          <li id="internalslot-jitterbuffertarget" data-test="webrtc/RTCRtpReceiver-jitterBufferTarget.html">
             <p>
               Let <var>receiver</var> have a <dfn class="export" data-dfn-for="RTCRtpReceiver">[[\JitterBufferTarget]]</dfn>
               internal slot initialized to <code>null</code>.
@@ -10310,7 +10353,8 @@ <h2>
               Attributes
             </h2>
             <dl data-link-for="RTCRtpReceiver" data-dfn-for="RTCRtpReceiver"
-            class="attributes">
+		class="attributes">
+	      <div>
               <dt>
                 <dfn data-idl="" id="dom-rtpreceiver-track">track</dfn> of type
                 <span class="idlAttrType">{{MediaStreamTrack}}</span>, readonly
@@ -10329,11 +10373,13 @@ <h2>
                   return the value of the {{RTCRtpReceiver/[[ReceiverTrack]]}} slot.
                 </p>
               </dd>
+	      </div>
+              <div>
               <dt>
                 <dfn data-idl="">transport</dfn> of type <span class=
                 "idlAttrType">{{RTCDtlsTransport}}</span>, readonly, nullable
               </dt>
-              <dd id="rtcrtpreceiver-attributes-transport">
+              <dd>
                 <p>
                   The {{transport}} attribute is the transport over which media
                   for the receiver's {{RTCRtpReceiver/track}} is received in
@@ -10348,8 +10394,10 @@ <h2>
                   {{RTCRtpReceiver/[[ReceiverTransport]]}} slot.
                 </p>
               </dd>
-	      <dt class="add-to-rtcrtpreceiver-attributes-transport"><dfn>jitterBufferTarget</dfn> of type {{DOMHighResTimeStamp}}, nullable
-		<dd data-tests="RTCRtpReceiver-jitterBufferTarget.html,RTCRtpReceiver-audio-jitterBufferTarget-stats.https.html,RTCRtpReceiver-video-jitterBufferTarget-stats.html"  class="add-to-rtcrtpreceiver-attributes-transport">
+	      </div>
+	      <div id="rtcrtpreceiver-jitterbuffertarget">
+	      <dt><dfn>jitterBufferTarget</dfn> of type {{DOMHighResTimeStamp}}, nullable
+		<dd data-tests="RTCRtpReceiver-jitterBufferTarget.html,RTCRtpReceiver-audio-jitterBufferTarget-stats.https.html,RTCRtpReceiver-video-jitterBufferTarget-stats.html">
           <p>This attribute allows the application to specify a target duration
           of time in milliseconds of media for the {{RTCRtpReceiver}}'s jitter
           buffer to hold. This influences the amount of buffering done by the
@@ -10453,7 +10501,7 @@ <h2>
               </ol>
             </li>
           </ol>
-        </dd>
+        </dd></div>
             </dl>
           </section>
           <section>
@@ -15432,10 +15480,10 @@ <h3>
           <li class="no-test-needed">Let <var>connection</var> be the
           {{RTCPeerConnection}} associated with <var>transceiver</var>.
           </li>
-          <li id="dtmf-stopping">If <var>connection</var>'s {{RTCPeerConnectionState}} is not
+          <li>If <var>connection</var>'s {{RTCPeerConnectionState}} is not
           {{RTCPeerConnectionState/"connected"}} return <code>false</code>.
           </li>
-          <li class="add-to-dtmf-stopping">If <var>transceiver</var>.{{RTCRtpTransceiver/[[Stopping]]}} is
+          <li id="no-dtmf-stopped-transceiver">If <var>transceiver</var>.{{RTCRtpTransceiver/[[Stopping]]}} is
           <code>true</code> return <code>false</code>.
           </li>
           <li>If <var>sender</var>.{{RTCRtpSender/[[SenderTrack]]}} is <code>null</code>