diff --git a/.travis.yml b/.travis.yml
index 555440c..3b2fe5d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,20 +1,5 @@
 language: node_js
-sudo: required
-before_script:
-- npm install -g bower polymer-cli
-- polymer install
 node_js: '6'
-addons:
-  firefox: latest
-  apt:
-    sources:
-    - google-chrome
-    packages:
-    - google-chrome-stable
-script:
-- xvfb-run polymer test
-- if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then polymer test -s 'windows 10/microsoftedge@14' -s 'os x 10.11/safari@9' -s 'macos 10.12/safari@10'; fi
-dist: trusty
 env:
   global:
   - secure: VpPRx1TJb2Kw3+Em4ViH3H2CRHwM+mzliygcWc+kH0k9+iYnKfTOfI+ZsrzE5joCy7qZPAQgNKduvZ9/oDAZrGx/byhFcu5a+/I4sJPQP7kHXVtGK5+WN3Db8uKGkTc5J2539qAhYLmER+gRhazz2c7QQL6zS4cfkYArprEXANJk6neW+kyRN0TYl0YZVp2vW6ZqRxgCv7UDma2u/DIq37Z2T+CzAOYOoZccIWMN4qeEucZZDLf15c+MuTC2sq+BR9t4360Lj4Cp6WPOm5MWpo2pYFHTWOCEviVlzumQh4V9Xb5OXpASoZ7mTHiqXhgkmIWhk527A3GOo2VYPmOH7s/C3VbMabgJhmQVOIIg/IwRnIeTOLbPyOaQFmz2fA9s799noUV7PSCelBISacn0OtYfE6HcWWzICRv7ji6P/lTPOMBarxfqBQx3tgDoGEe019qxEoA3XT6T36MBntg7SKLNu/3Ankt0euC8x65v/zOLpnDfjbzBcgz8p4XCThpwNJNobo0ZMwljHqBqrsd2CDAWixCuVbKoUwuzn8PusG8HYZKCDOUsiRi42Ub0mcubJpqZTx3mcmgb/iAJAf/6s4iropqzpzeAM4sX/CwS/HaqdRa/KW/6jCBVLJApvGOJ862GXpUh7AKgIi0VW1zfMolBSyFEJNV4wFhGfFqsZ3M=
diff --git a/README.md b/README.md
index 50831fc..e6d5b04 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,10 @@
-[![Build Status](https://travis-ci.org/PolymerLabs/blockingElements.svg?branch=master)](https://travis-ci.org/PolymerLabs/blockingElements)
+[![Build Status](https://travis-ci.org/PolymerLabs/blocking-elements.svg?branch=master)](https://travis-ci.org/PolymerLabs/blocking-elements)
 
-# `blockingElements` stack API
+# Blocking Elements stack API
 
-Implementation of proposal <https://github.com/whatwg/html/issues/897>
+Implementation of proposal https://github.com/whatwg/html/issues/897
+
+> The polyfill chooses a non-colliding name (`document.$blockingElements` instead of `document.blockingElements`) as the proposal is still work in progress and hasn't yet reached consensus on the semantics and functionality (see [this discussion](https://github.com/PolymerLabs/blocking-elements/pull/1#issuecomment-235102344) for more details).
 
 `document.$blockingElements` manages a stack of elements that inert the interaction outside them.
 
@@ -15,7 +17,7 @@ This polyfill will:
 - search for the path of the element to block up to `document.body`
 - set `inert` to all the siblings of each parent, skipping the parents and the element's distributed content (if any)
 
-Use this polyfill together with the [WICG/inert](https://github.com/WICG/inert) polyfill to disable interactions on the rest of the document. See the [demo page](https://github.com/PolymerLabs/blockingElements/blob/master/demo/index.html) as an example.
+Use this polyfill together with the [wicg-inert](https://github.com/WICG/inert) polyfill to disable interactions on the rest of the document. See the [demo page](https://github.com/PolymerLabs/blocking-elements/blob/master/demo/index.html) as an example.
 
 ## Why not listening to events that trigger focus change?
 
@@ -25,21 +27,51 @@ Wrapping the focus requires to find all the focusable nodes within the top block
 
 This approach doesn't allow the focus to move outside the window (e.g. to the browser's url bar, dev console if opened, etc.), and is less robust when used with assistive technology (e.g. android talkback allows to move focus with swipe on screen, Apple Voiceover allows to move focus with special keyboard combinations).
 
-## Install & run locally
+## Install & use
 
-Install the dependencies with `bower install`.
+Blocking Elements relies on the [`inert` attribute](https://github.com/WICG/inert) and uses [`Set` objects](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set), so make sure to include their polyfills as needed.
 
-Serve the resources via the [polymer CLI](https://github.com/Polymer/polymer-cli):
 ```bash
-$ npm install -g polymer-cli
-$ polymer serve
+npm install --save babel-polyfill
+npm install --save wicg-inert
+npm install --save blocking-elements
+```
+
+```html
+<script src="./node_modules/babel-polyfill/dist/polyfill.min.js"></script>
+<script src="./node_modules/wicg-inert/dist/inert.min.js"></script>
+<script src="./node_modules/blocking-elements/dist/blocking-elements.min.js"></script>
+
+<div id="container">
+  <button onclick="makeBlocking(container)">make blocking</button> 
+  <button onclick="undoBlocking(container)">undo blocking</button> 
+</div>
+
+<button>some button</button>
+
+<script>
+  function makeBlocking(element) {
+    document.$blockingElements.push(element);
+  }
+  function undoBlocking(element) {
+    document.$blockingElements.remove(element);
+  }
+</script>
 ```
 
+## Local development
+
+Install the dependencies with `npm install` and serve the resources.
+
+Run the tests locally by navigating to http://localhost:8080/test/
+
 ## Performance
 
 Performance is dependent on the `inert` polyfill performance. Chrome recently landed [the `inert` attribute implementation](https://codereview.chromium.org/2088453002/) behind a flag.
 
-Let's compare the how long it takes to toggle the deepest `x-trap-focus` inside nested `x-b` of the demo page (<http://localhost:8080/components/blockingElements/demo/ce.html?ce=v1>) ![results](https://cloud.githubusercontent.com/assets/6173664/17538133/914f365a-5e57-11e6-9b91-1c6b7eb22d57.png).
+Let's compare the how long it takes to toggle the deepest `x-trap-focus` inside nested `x-b` of the demo page (<http://localhost:8080/demo/ce.html?ce=v1>) 
+
+![results](https://cloud.githubusercontent.com/assets/6173664/17538133/914f365a-5e57-11e6-9b91-1c6b7eb22d57.png).
 
 `blockingElements` with native inert is **~15x faster** than polyfilled inert 🎉 🎉 🎉
 
diff --git a/bower.json b/bower.json
deleted file mode 100644
index ce8a234..0000000
--- a/bower.json
+++ /dev/null
@@ -1,23 +0,0 @@
-{
-  "name": "blocking-elements",
-  "description": "A polyfill for the proposed blocking elments stack API",
-  "main": "blocking-elements.html",
-  "authors": [
-    "Valdrin Koshi <valdrin@google.com>"
-  ],
-  "license": "Apache-2.0",
-  "keywords": [
-    "blocking",
-    "elements",
-    "polyfill",
-    "browser"
-  ],
-  "homepage": "https://github.com/PolymerLabs/blockingElements",
-  "private": true,
-  "devDependencies": {
-    "inert": "WICG/inert#^1",
-    "web-component-tester": "Polymer/web-component-tester#^6",
-    "webcomponentsjs": "webcomponents/webcomponentsjs#^1"
-  },
-  "ignore": []
-}
diff --git a/demo/ce.html b/demo/ce.html
index a43ba49..e7bc024 100644
--- a/demo/ce.html
+++ b/demo/ce.html
@@ -16,9 +16,10 @@
 <head>
   <meta charset="utf-8">
   <title>blockingElements polyfill test page</title>
-  <script src="../../webcomponentsjs/webcomponents-loader.js"></script>
-  <script src="../../inert/dist/inert.js"></script>
-  <script src="../dist/blocking-elements.js"></script>
+  <script src="../node_modules/babel-polyfill/dist/polyfill.min.js"></script>
+  <script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+  <script src="../node_modules/wicg-inert/dist/inert.js"></script>
+  <!-- blocking-elements polyfill imported by x-trap-focus.html -->
 
   <script>
     // Dynamic import according to query param ce=v0|v1.
diff --git a/demo/index.html b/demo/index.html
index ae9c1b8..ecb52fe 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -16,7 +16,8 @@
 <head>
   <meta charset="utf-8">
   <title>blockingElements polyfill test page</title>
-  <script src="../../inert/dist/inert.js"></script>
+  <script src="../node_modules/babel-polyfill/dist/polyfill.min.js"></script>
+  <script src="../node_modules/wicg-inert/dist/inert.js"></script>
   <script src="../dist/blocking-elements.js"></script>
 
   <style>
diff --git a/demo/nytimes.html b/demo/nytimes.html
index 4f427f8..ef3c22c 100644
--- a/demo/nytimes.html
+++ b/demo/nytimes.html
@@ -16,7 +16,8 @@
 <head>
   <meta charset="utf-8">
   <title>blockingElements polyfill test page</title>
-  <script src="../../inert/dist/inert.js"></script>
+  <script src="../node_modules/babel-polyfill/dist/polyfill.min.js"></script>
+  <script src="../node_modules/wicg-inert/dist/inert.js"></script>
   <script src="../dist/blocking-elements.js"></script>
 
   <style>
diff --git a/package-lock.json b/package-lock.json
index 13f98e2..3793df1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,24 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@types/node": {
+      "version": "8.9.5",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-8.9.5.tgz",
+      "integrity": "sha512-jRHfWsvyMtXdbhnz5CVHxaBgnV6duZnPlQuRSo/dm/GnmikNcmZhxIES4E9OZjUmQ8C+HCl4KJux+cXN/ErGDQ==",
+      "dev": true
+    },
+    "@webcomponents/webcomponentsjs": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@webcomponents/webcomponentsjs/-/webcomponentsjs-1.1.0.tgz",
+      "integrity": "sha512-7toNyVlrl7vJnY3PU0eXIK1KWq8phfnEe1IwOdCMxkIl/BfUkUB2aaVs45R0LSx1qxHRnkqj0vlGtskUvKkNkA==",
+      "dev": true
+    },
+    "abbrev": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
+      "dev": true
+    },
     "acorn": {
       "version": "5.5.3",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.5.3.tgz",
@@ -27,16 +45,38 @@
         }
       }
     },
+    "adm-zip": {
+      "version": "0.4.7",
+      "resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.4.7.tgz",
+      "integrity": "sha1-hgbCy/HEJs6MjsABdER/1Jtur8E=",
+      "dev": true
+    },
+    "agent-base": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-2.1.1.tgz",
+      "integrity": "sha1-1t4Q1a9hMtW9aSQn1G/FOFOQlMc=",
+      "dev": true,
+      "requires": {
+        "extend": "3.0.1",
+        "semver": "5.0.3"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.0.3",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.0.3.tgz",
+          "integrity": "sha1-d0Zt5YnNXTyV8TiqeLxWmjy10no=",
+          "dev": true
+        }
+      }
+    },
     "ajv": {
-      "version": "5.5.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
-      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+      "version": "4.11.8",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
+      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
       "dev": true,
       "requires": {
         "co": "4.6.0",
-        "fast-deep-equal": "1.1.0",
-        "fast-json-stable-stringify": "2.0.0",
-        "json-schema-traverse": "0.3.1"
+        "json-stable-stringify": "1.0.1"
       }
     },
     "ajv-keywords": {
@@ -114,6 +154,51 @@
       "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
       "dev": true
     },
+    "asn1": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
+      "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y=",
+      "dev": true
+    },
+    "assert-plus": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.2.0.tgz",
+      "integrity": "sha1-104bh+ev/A24qttwIfP+SBAasjQ=",
+      "dev": true
+    },
+    "assertion-error": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
+      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
+      "dev": true
+    },
+    "async": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.0.tgz",
+      "integrity": "sha512-xAfGg1/NTLBBKlHFmnd7PlmUW9KhVQIUuSrYem9xzFUZy13ScvtyGGejaae9iAVRiRq9+Cx7DPFaAAhCpyxyPw==",
+      "dev": true,
+      "requires": {
+        "lodash": "4.17.5"
+      }
+    },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "dev": true
+    },
+    "aws-sign2": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.6.0.tgz",
+      "integrity": "sha1-FDQt0428yU0OW4fXY81jYSwOeU8=",
+      "dev": true
+    },
+    "aws4": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.6.0.tgz",
+      "integrity": "sha1-g+9cqGCysy5KDe7e6MdxudtXRx4=",
+      "dev": true
+    },
     "babel-code-frame": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
@@ -761,6 +846,35 @@
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
+    "bcrypt-pbkdf": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.1.tgz",
+      "integrity": "sha1-Y7xdy2EzG5K8Bf1SiVPDNGKgb40=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "tweetnacl": "0.14.5"
+      }
+    },
+    "binary": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/binary/-/binary-0.3.0.tgz",
+      "integrity": "sha1-n2BVO8XOjDOG87VTz/R0Yq3sqnk=",
+      "dev": true,
+      "requires": {
+        "buffers": "0.1.1",
+        "chainsaw": "0.1.0"
+      }
+    },
+    "boom": {
+      "version": "2.10.1",
+      "resolved": "https://registry.npmjs.org/boom/-/boom-2.10.1.tgz",
+      "integrity": "sha1-OciRjO/1eZ+D+UkqhI9iWt0Mdm8=",
+      "dev": true,
+      "requires": {
+        "hoek": "2.16.3"
+      }
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -782,6 +896,12 @@
         "repeat-element": "1.1.2"
       }
     },
+    "browser-stdout": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
+      "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
+      "dev": true
+    },
     "browserslist": {
       "version": "2.11.3",
       "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-2.11.3.tgz",
@@ -792,6 +912,12 @@
         "electron-to-chromium": "1.3.39"
       }
     },
+    "buffers": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/buffers/-/buffers-0.1.1.tgz",
+      "integrity": "sha1-skV5w77U1tOWru5tmorn9Ugqt7s=",
+      "dev": true
+    },
     "builtin-modules": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-2.0.0.tgz",
@@ -813,12 +939,47 @@
       "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
       "dev": true
     },
+    "camelcase": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
+      "integrity": "sha1-m7UwTS4LVmmLLHWLCKPqqdqlijk=",
+      "dev": true
+    },
     "caniuse-lite": {
       "version": "1.0.30000815",
       "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30000815.tgz",
       "integrity": "sha512-PGSOPK6gFe5fWd+eD0u2bG0aOsN1qC4B1E66tl3jOsIoKkTIcBYAc2+O6AeNzKW8RsFykWgnhkTlfOyuTzgI9A==",
       "dev": true
     },
+    "caseless": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
+      "dev": true
+    },
+    "chai": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.1.2.tgz",
+      "integrity": "sha1-D2RYS6ZC8PKs4oBiefTwbKI61zw=",
+      "dev": true,
+      "requires": {
+        "assertion-error": "1.1.0",
+        "check-error": "1.0.2",
+        "deep-eql": "3.0.1",
+        "get-func-name": "2.0.0",
+        "pathval": "1.1.0",
+        "type-detect": "4.0.8"
+      }
+    },
+    "chainsaw": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/chainsaw/-/chainsaw-0.1.0.tgz",
+      "integrity": "sha1-XqtQsor+WAdNDVgpE4iCi15fvJg=",
+      "dev": true,
+      "requires": {
+        "traverse": "0.3.9"
+      }
+    },
     "chalk": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
@@ -838,6 +999,12 @@
       "integrity": "sha1-tUc7M9yXxCTl2Y3IfVXU2KKci/I=",
       "dev": true
     },
+    "check-error": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
+      "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
+      "dev": true
+    },
     "circular-json": {
       "version": "0.3.3",
       "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.3.tgz",
@@ -859,12 +1026,29 @@
       "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
       "dev": true
     },
+    "cliui": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
+      "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
+      "dev": true,
+      "requires": {
+        "string-width": "1.0.2",
+        "strip-ansi": "3.0.1",
+        "wrap-ansi": "2.1.0"
+      }
+    },
     "co": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
       "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
       "dev": true
     },
+    "code-point-at": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
+      "dev": true
+    },
     "color-convert": {
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.1.tgz",
@@ -880,10 +1064,19 @@
       "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
       "dev": true
     },
+    "combined-stream": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
+      "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
+      "dev": true,
+      "requires": {
+        "delayed-stream": "1.0.0"
+      }
+    },
     "commander": {
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+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+          "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+          "dev": true,
+          "requires": {
+            "is-fullwidth-code-point": "2.0.0",
+            "strip-ansi": "4.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "3.0.0"
+          }
+        },
         "supports-color": {
           "version": "5.3.0",
           "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.3.0.tgz",
@@ -2548,12 +3799,63 @@
       "integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc=",
       "dev": true
     },
+    "touch": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/touch/-/touch-0.0.3.tgz",
+      "integrity": "sha1-Ua7z1ElXHU8oel2Hyci0kYGg2x0=",
+      "dev": true,
+      "requires": {
+        "nopt": "1.0.10"
+      },
+      "dependencies": {
+        "nopt": {
+          "version": "1.0.10",
+          "resolved": "https://registry.npmjs.org/nopt/-/nopt-1.0.10.tgz",
+          "integrity": "sha1-bd0hvSoxQXuScn3Vhfim83YI6+4=",
+          "dev": true,
+          "requires": {
+            "abbrev": "1.1.1"
+          }
+        }
+      }
+    },
+    "tough-cookie": {
+      "version": "2.3.4",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
+      "integrity": "sha512-TZ6TTfI5NtZnuyy/Kecv+CnoROnyXn2DN97LontgQpCwsX2XyLYCC0ENhYkehSOwAp8rTQKc/NUIF7BkQ5rKLA==",
+      "dev": true,
+      "requires": {
+        "punycode": "1.4.1"
+      }
+    },
+    "traverse": {
+      "version": "0.3.9",
+      "resolved": "https://registry.npmjs.org/traverse/-/traverse-0.3.9.tgz",
+      "integrity": "sha1-cXuPIgzAu3tE5AUUwisui7xw2Lk=",
+      "dev": true
+    },
     "trim-right": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
       "dev": true
     },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "5.1.1"
+      }
+    },
+    "tweetnacl": {
+      "version": "0.14.5",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
+      "dev": true,
+      "optional": true
+    },
     "type-check": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
@@ -2563,6 +3865,12 @@
         "prelude-ls": "1.1.2"
       }
     },
+    "type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+      "dev": true
+    },
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
@@ -2575,10 +3883,16 @@
       "integrity": "sha512-FMh5SRqJRGhv9BbaTffENIpDDQIoPDR8DBraunGORGhySArsXlw9++CN+BWzPBLpoI4RcSnpfGPnilTxWL3Vvg==",
       "dev": true,
       "requires": {
-        "commander": "2.15.0",
+        "commander": "2.15.1",
         "source-map": "0.6.1"
       },
       "dependencies": {
+        "commander": {
+          "version": "2.15.1",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.15.1.tgz",
+          "integrity": "sha512-VlfT9F3V0v+jr4yxPc5gg9s62/fIVWsd2Bk2iD435um1NlGMYdVCq+MjcXnhYq2icNOizHr1kK+5TI6H0Hy0ag==",
+          "dev": true
+        },
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -2587,12 +3901,49 @@
         }
       }
     },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
+      "dev": true
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
+      "dev": true
+    },
+    "uuid": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.2.1.tgz",
+      "integrity": "sha512-jZnMwlb9Iku/O3smGWvZhauCf6cvvpKi4BKRiliS3cxnI+Gz9j5MEpTz2UFuXiKPJocb7gnsLHwiS05ige5BEA==",
+      "dev": true
+    },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "1.3.0"
+      },
+      "dependencies": {
+        "assert-plus": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+          "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+          "dev": true
+        }
+      }
+    },
     "vlq": {
       "version": "0.2.3",
       "resolved": "https://registry.npmjs.org/vlq/-/vlq-0.2.3.tgz",
@@ -2608,12 +3959,37 @@
         "isexe": "2.0.0"
       }
     },
+    "wicg-inert": {
+      "version": "1.1.6",
+      "resolved": "https://registry.npmjs.org/wicg-inert/-/wicg-inert-1.1.6.tgz",
+      "integrity": "sha512-svnNP2bUZc1luu0erL2Y25Iyxsm0SUk9wNq3FbgTgxcrqG3YAZBPYonRNRGgpveeEqRAnNE5yNcIdEd/F86tbw==",
+      "dev": true,
+      "requires": {
+        "dom-matches": "2.0.0"
+      }
+    },
+    "window-size": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.4.tgz",
+      "integrity": "sha1-+OGqHuWlPsW/FR/6CXQqatdpeHY=",
+      "dev": true
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
       "dev": true
     },
+    "wrap-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "dev": true,
+      "requires": {
+        "string-width": "1.0.2",
+        "strip-ansi": "3.0.1"
+      }
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -2629,11 +4005,31 @@
         "mkdirp": "0.5.1"
       }
     },
+    "y18n": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+      "dev": true
+    },
     "yallist": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
+    },
+    "yargs": {
+      "version": "3.29.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.29.0.tgz",
+      "integrity": "sha1-GquWYOrnnYuPZ1vK7qtu40ws9pw=",
+      "dev": true,
+      "requires": {
+        "camelcase": "1.2.1",
+        "cliui": "3.2.0",
+        "decamelize": "1.2.0",
+        "os-locale": "1.4.0",
+        "window-size": "0.1.4",
+        "y18n": "3.2.1"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index d746125..9fa4b64 100644
--- a/package.json
+++ b/package.json
@@ -20,25 +20,59 @@
   "homepage": "https://github.com/PolymerLabs/blockingElements#readme",
   "scripts": {
     "lint": "eslint blocking-elements.js",
-    "test": "npm run lint && npm run build && bower install && polymer test",
-    "build": "rollem",
-    "dev": "rollem --watch"
-  },
-  "peerDependencies": {
-    "wigc-inert": "^1.1.6"
+    "test": "npm run lint && npm run build && easy-sauce",
+    "build": "rollem"
   },
   "devDependencies": {
+    "@webcomponents/webcomponentsjs": "^1.1.0",
     "babel-core": "^6.26.0",
     "babel-plugin-external-helpers": "^6.22.0",
-    "babel-polyfill": "^6.13.0",
+    "babel-polyfill": "^6.26.0",
     "babel-preset-env": "^1.6.1",
+    "chai": "^4.0.2",
+    "easy-sauce": "^0.4.1",
     "eslint": "^4.0.0",
     "eslint-config-google": "^0.9.1",
+    "mocha": "^4.0.1",
     "rollem": "^1.11.0",
     "rollup": "^0.53.0",
     "rollup-plugin-babel": "^3.0.2",
     "rollup-plugin-commonjs": "^8.0.2",
     "rollup-plugin-node-resolve": "^3.0.0",
-    "rollup-plugin-uglify": "^2.0.1"
+    "rollup-plugin-uglify": "^2.0.1",
+    "wicg-inert": "^1.1.6"
+  },
+  "easySauce": {
+    "testPath": "/test/",
+    "port": "8080",
+    "service": "sauce-connect",
+    "max-duration": 120,
+    "platforms": [
+      [
+        "Windows 10",
+        "chrome",
+        "latest"
+      ],
+      [
+        "Linux",
+        "firefox",
+        "latest"
+      ],
+      [
+        "Windows 10",
+        "microsoftedge",
+        "14"
+      ],
+      [
+        "OS X 10.11",
+        "safari",
+        "9"
+      ],
+      [
+        "OS X 10.12",
+        "safari",
+        "10"
+      ]
+    ]
   }
 }
diff --git a/test/basic.html b/test/basic.html
deleted file mode 100644
index b264f0d..0000000
--- a/test/basic.html
+++ /dev/null
@@ -1,206 +0,0 @@
-<!doctype html>
-<!--
-@license
-Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
-The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
-Code distributed by Google as part of the polymer project is also
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
--->
-
-<html>
-
-<head>
-
-  <title>blockingElements basic</title>
-  <meta charset="utf-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
-
-  <script src="../../webcomponentsjs/webcomponents-lite.js"></script>
-  <script src="../../web-component-tester/browser.js"></script>
-
-  <script src="../dist/blocking-elements.js"></script>
-
-</head>
-
-<body>
-
-  <test-fixture id="basic">
-    <template>
-      <div>
-        <button>button</button>
-        <button>button</button>
-        <button>button</button>
-      </div>
-    </template>
-  </test-fixture>
-
-  <test-fixture id="nested">
-    <template>
-      <div>
-        <button>button</button>
-        <button>button</button>
-        <button>button</button>
-        <div id="inner">
-          <button>button</button>
-          <button>button</button>
-          <button>button</button>
-        </div>
-      </div>
-    </template>
-  </test-fixture>
-
-  <script>
-    function emptyBlockingElements() {
-      while (document.$blockingElements.pop()) {
-        // keep popping!
-      }
-    }
-
-    suite('basic', function() {
-
-      let container;
-
-      setup(function() {
-        container = fixture('basic');
-      });
-
-      teardown(function() {
-        emptyBlockingElements();
-      });
-
-      test('document.$blockingElements is defined', function() {
-        assert.isOk(document.$blockingElements);
-      });
-
-      test('push() adds an element to the stack, remove() removes it', function() {
-        const child = container.children[0];
-        assert.equal(document.$blockingElements.top, null);
-        document.$blockingElements.push(child);
-        assert.equal(document.$blockingElements.top, child);
-
-        document.$blockingElements.remove(child);
-        assert.equal(document.$blockingElements.top, null);
-      });
-
-      test('push() can be used to make an already blocking element the top blocking element', function() {
-        assert.equal(document.$blockingElements.top, null);
-        document.$blockingElements.push(container.children[0]);
-        assert.equal(document.$blockingElements.top, container.children[0], 'child0 is top blocking element');
-        // Add another element.
-        document.$blockingElements.push(container.children[1]);
-        assert.equal(document.$blockingElements.top, container.children[1], 'child1 is top blocking element');
-        // Push again first element.
-        document.$blockingElements.push(container.children[0]);
-        assert.equal(document.$blockingElements.top, container.children[0], 'child0 brought to top');
-      });
-
-      test('push() adds only elements contained in document', function() {
-        assert.equal(document.$blockingElements.top, null);
-        assert.throws(function() {
-          document.$blockingElements.push(document.createElement('div'));
-        }, 'Non-connected element cannot be a blocking element');
-        assert.equal(document.$blockingElements.top, null, 'element is not a blocking element');
-      });
-
-      test('pop() removes the top blocking element from stack and returns it', function() {
-        document.$blockingElements.push(container.children[0]);
-        document.$blockingElements.push(container.children[1]);
-        assert.isTrue(document.$blockingElements.has(container.children[0]), '1st child is a blocking element');
-        assert.equal(document.$blockingElements.top, container.children[1], '2nd child is top blocking element');
-        assert.equal(document.$blockingElements.pop(), container.children[1], '2nd child removed');
-        assert.equal(document.$blockingElements.top, container.children[0], '1sd child is top blocking element');
-      });
-
-      test('preserve already inert elements', function() {
-        assert.equal(document.$blockingElements.top, null);
-        const child = container.children[0];
-        // Make children[1] inert
-        container.children[1].inert = true;
-        // Push and remove children[0], see if inert is preserved.
-        document.$blockingElements.push(child);
-        assert.equal(document.$blockingElements.top, child);
-        document.$blockingElements.remove(child);
-        assert.equal(document.$blockingElements.top, null);
-        assert.isTrue(container.children[1].inert, 'inert preserved');
-      });
-
-      test('multiple push() update elements inertness', function() {
-        document.$blockingElements.push(container.children[0]);
-        assert.equal(document.$blockingElements.top, container.children[0]);
-        assert.isNotOk(container.children[0].inert, '1st child active');
-        assert.isTrue(container.children[1].inert, '2nd child inert');
-        assert.isTrue(container.children[2].inert, '3rd child inert');
-
-        document.$blockingElements.push(container.children[1]);
-        assert.isTrue(document.$blockingElements.has(container.children[0]), '1st child is a blocking element');
-        assert.equal(document.$blockingElements.top, container.children[1], '2nd child is top blocking element');
-        assert.isTrue(container.children[0].inert, '1st child inert');
-        assert.isNotOk(container.children[1].inert, '2nd child active');
-        assert.isTrue(container.children[2].inert, '3rd child inert');
-      });
-
-      test('remove() handles elements not in the dom anymore', function() {
-        const child = container.children[0];
-        document.$blockingElements.push(child);
-        assert.equal(document.$blockingElements.top, child);
-        container.removeChild(child);
-        document.$blockingElements.remove(child);
-        assert.equal(document.$blockingElements.top, null);
-        assert.isNotOk(container.inert, 'container active');
-        // Remaining children should be active.
-        for (let i = 0; i < container.children.length; i++) {
-          assert.isNotOk(container.children[i].inert, 'sibling active');
-        }
-      });
-
-      test('destructor resets the document inertness', function() {
-        document.$blockingElements.push(container.children[0]);
-        // Destroy and then construct again.
-        document.$blockingElements.destructor();
-        document.$blockingElements = new document.$blockingElements.constructor();
-        assert.isNotOk(container.inert, 'container active');
-        // Remaining children should be active.
-        for (let i = 0; i < container.children.length; i++) {
-          assert.isNotOk(container.children[i].inert, 'sibling active');
-        }
-      });
-
-    });
-
-    suite('nested', function() {
-      let container, inner;
-
-      setup(function() {
-        container = fixture('nested');
-        inner = container.querySelector('#inner');
-      });
-
-      teardown(function() {
-        emptyBlockingElements();
-      });
-
-      test('push() keeps parent tree active', function() {
-        assert.equal(document.$blockingElements.top, null);
-        document.$blockingElements.push(inner.children[0]);
-        assert.equal(document.$blockingElements.top, inner.children[0]);
-
-        // node and its parents should be active
-        assert.isNotOk(inner.children[0].inert, 'inner child active');
-        assert.isNotOk(inner.inert, 'inner active');
-
-        // Its siblings and parent's siblings should be inert.
-        for (var i = 1; i < inner.children.length; i++) {
-          assert.isTrue(inner.children[i].inert, 'inner sibling inert');
-        }
-        assert.isTrue(container.children[0].inert, '1st child inert');
-        assert.isTrue(container.children[1].inert, '2nd child inert');
-        assert.isTrue(container.children[2].inert, '3rd child inert');
-      });
-    });
-  </script>
-
-</body>
-
-</html>
diff --git a/test/basic.js b/test/basic.js
new file mode 100644
index 0000000..d417227
--- /dev/null
+++ b/test/basic.js
@@ -0,0 +1,195 @@
+/**
+ * @license
+ * Copyright 2016 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+(function() {
+  var assert = chai.assert;
+  var fixtureLoader = new Fixture();
+  /* eslint-disable require-jsdoc */
+
+  function emptyBlockingElements() {
+    while (document.$blockingElements.pop()) {
+      // keep popping!
+    }
+  }
+
+  describe('basic', function() {
+    var container;
+
+    beforeEach(function() {
+      container = fixtureLoader.load(`
+      <div>
+        <button>button</button>
+        <button>button</button>
+        <button>button</button>
+      </div>`);
+    });
+
+    afterEach(function() {
+      emptyBlockingElements();
+      fixtureLoader.destroy();
+    });
+
+    it('document.$blockingElements is defined', function() {
+      assert.isOk(document.$blockingElements);
+    });
+
+    it('push() adds an element to the stack, remove() removes it', function() {
+      var child = container.children[0];
+      assert.equal(document.$blockingElements.top, null);
+      document.$blockingElements.push(child);
+      assert.equal(document.$blockingElements.top, child);
+
+      document.$blockingElements.remove(child);
+      assert.equal(document.$blockingElements.top, null);
+    });
+
+    it('push() can be used to make an already blocking element the top blocking element',
+      function() {
+        assert.equal(document.$blockingElements.top, null);
+        document.$blockingElements.push(container.children[0]);
+        assert.equal(document.$blockingElements.top, container.children[0],
+          'child0 is top blocking element');
+        // Add another element.
+        document.$blockingElements.push(container.children[1]);
+        assert.equal(document.$blockingElements.top, container.children[1],
+          'child1 is top blocking element');
+        // Push again first element.
+        document.$blockingElements.push(container.children[0]);
+        assert.equal(document.$blockingElements.top, container.children[0],
+          'child0 brought to top');
+      });
+
+    it('push() adds only elements contained in document', function() {
+      assert.equal(document.$blockingElements.top, null);
+      assert.throws(function() {
+        document.$blockingElements.push(document.createElement('div'));
+      }, 'Non-connected element cannot be a blocking element');
+      assert.equal(document.$blockingElements.top, null, 'element is not a blocking element');
+    });
+
+    it('pop() removes the top blocking element from stack and returns it', function() {
+      document.$blockingElements.push(container.children[0]);
+      document.$blockingElements.push(container.children[1]);
+      assert.isTrue(document.$blockingElements.has(container.children[0]),
+        '1st child is a blocking element');
+      assert.equal(document.$blockingElements.top, container.children[1],
+        '2nd child is top blocking element');
+      assert.equal(document.$blockingElements.pop(), container.children[1],
+        '2nd child removed');
+      assert.equal(document.$blockingElements.top, container.children[0],
+        '1sd child is top blocking element');
+    });
+
+    it('preserve already inert elements', function() {
+      assert.equal(document.$blockingElements.top, null);
+      var child = container.children[0];
+      // Make children[1] inert
+      container.children[1].inert = true;
+      // Push and remove children[0], see if inert is preserved.
+      document.$blockingElements.push(child);
+      assert.equal(document.$blockingElements.top, child);
+      document.$blockingElements.remove(child);
+      assert.equal(document.$blockingElements.top, null);
+      assert.isTrue(container.children[1].inert, 'inert preserved');
+    });
+
+    it('multiple push() update elements inertness', function() {
+      document.$blockingElements.push(container.children[0]);
+      assert.equal(document.$blockingElements.top, container.children[0]);
+      assert.isNotOk(container.children[0].inert, '1st child active');
+      assert.isTrue(container.children[1].inert, '2nd child inert');
+      assert.isTrue(container.children[2].inert, '3rd child inert');
+
+      document.$blockingElements.push(container.children[1]);
+      assert.isTrue(document.$blockingElements.has(container.children[0]),
+        '1st child is a blocking element');
+      assert.equal(document.$blockingElements.top, container.children[1],
+        '2nd child is top blocking element');
+      assert.isTrue(container.children[0].inert, '1st child inert');
+      assert.isNotOk(container.children[1].inert, '2nd child active');
+      assert.isTrue(container.children[2].inert, '3rd child inert');
+    });
+
+    it('remove() handles elements not in the dom anymore', function() {
+      var child = container.children[0];
+      document.$blockingElements.push(child);
+      assert.equal(document.$blockingElements.top, child);
+      container.removeChild(child);
+      document.$blockingElements.remove(child);
+      assert.equal(document.$blockingElements.top, null);
+      assert.isNotOk(container.inert, 'container active');
+      // Remaining children should be active.
+      for (var i = 0; i < container.children.length; i++) {
+        assert.isNotOk(container.children[i].inert, 'sibling active');
+      }
+    });
+
+    it('destructor resets the document inertness', function() {
+      document.$blockingElements.push(container.children[0]);
+      // Destroy and then construct again.
+      document.$blockingElements.destructor();
+      document.$blockingElements = new document.$blockingElements.constructor();
+      assert.isNotOk(container.inert, 'container active');
+      // Remaining children should be active.
+      for (var i = 0; i < container.children.length; i++) {
+        assert.isNotOk(container.children[i].inert, 'sibling active');
+      }
+    });
+  });
+
+  describe('nested', function() {
+    var container;
+    var inner;
+
+    beforeEach(function() {
+      container = fixtureLoader.load(`
+        <div>
+          <button>button</button>
+          <button>button</button>
+          <button>button</button>
+          <div id="inner">
+            <button>button</button>
+            <button>button</button>
+            <button>button</button>
+          </div>
+        </div>`);
+      inner = container.querySelector('#inner');
+    });
+
+    afterEach(function() {
+      emptyBlockingElements();
+      fixtureLoader.destroy();
+    });
+
+    it('push() keeps parent tree active', function() {
+      assert.equal(document.$blockingElements.top, null);
+      document.$blockingElements.push(inner.children[0]);
+      assert.equal(document.$blockingElements.top, inner.children[0]);
+
+      // node and its parents should be active
+      assert.isNotOk(inner.children[0].inert, 'inner child active');
+      assert.isNotOk(inner.inert, 'inner active');
+
+      // Its siblings and parent's siblings should be inert.
+      for (var i = 1; i < inner.children.length; i++) {
+        assert.isTrue(inner.children[i].inert, 'inner sibling inert');
+      }
+      assert.isTrue(container.children[0].inert, '1st child inert');
+      assert.isTrue(container.children[1].inert, '2nd child inert');
+      assert.isTrue(container.children[2].inert, '3rd child inert');
+    });
+  });
+})();
\ No newline at end of file
diff --git a/test/helpers/fixture.js b/test/helpers/fixture.js
new file mode 100644
index 0000000..8c0515f
--- /dev/null
+++ b/test/helpers/fixture.js
@@ -0,0 +1,47 @@
+/**
+ * @license
+ * Copyright 2018 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+window.Fixture = function Fixture() {
+  if (!(this instanceof Fixture)) {
+    throw new TypeError('Cannot call a class as a function');
+  }
+
+  this._fixture = undefined;
+
+  /**
+   * Stick the html into a `<div id="fixture">`.
+   * @param {!string} html
+   * @return {Element|NodeList<Element>|null}
+   */
+  this.load = function(html) {
+    this._fixture = document.createElement('div');
+    this._fixture.id = 'fixture';
+    document.body.appendChild(this._fixture);
+    this._fixture.innerHTML = html;
+    var children = this._fixture.children;
+    return children.length === 1 ? children[0] : children;
+  };
+
+  /**
+   * Remove the current fixture and delete it.
+   */
+  this.destroy = function() {
+    document.body.removeChild(this._fixture);
+    this._fixture = undefined;
+  };
+  return this;
+};
diff --git a/test/index.html b/test/index.html
index b5f412b..4dbff7f 100644
--- a/test/index.html
+++ b/test/index.html
@@ -1,25 +1,74 @@
-<!DOCTYPE html><!--
-@license
-Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
-The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
-Code distributed by Google as part of the polymer project is also
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
---><html><head>
-
-    <meta charset="utf-8">
-    <title>Tests</title>
-    <script src="../../web-component-tester/browser.js"></script>
-
-  </head>
-  <body>
-
-    <script>
-      WCT.loadSuites([
-        'basic.html',
-        'shadow.html'
-      ]);
-    </script>
-
-</body></html>
+<!doctype html>
+<!--
+@license
+Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+<html>
+
+<head>
+  <meta charset="utf-8">
+  <title>Tests</title>
+  <link href="../node_modules/mocha/mocha.css" rel="stylesheet" />
+  <script src="../node_modules/mocha/mocha.js"></script>
+  <script src="../node_modules/chai/chai.js"></script>
+  <script src="../node_modules/babel-polyfill/dist/polyfill.min.js"></script>
+  <script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-lite.js"></script>
+  <script src="helpers/fixture.js"></script>
+</head>
+
+<body>
+
+  <!-- A container element for the visual Mocha results -->
+  <div id="mocha"></div>
+
+  <!-- Mocha setup and initiation code -->
+  <script>
+    mocha.setup('bdd');
+    window.onload = function() {
+      var runner = mocha.run();
+      var failedTests = [];
+
+      runner.on('end', function() {
+        window.mochaResults = runner.stats;
+        window.mochaResults.reports = failedTests;
+      });
+
+      runner.on('fail', logFailure);
+
+      function logFailure(test, err){
+        var flattenTitles = function(test){
+          var titles = [];
+          while (test.parent.title){
+            titles.push(test.parent.title);
+            test = test.parent;
+          }
+          return titles.reverse();
+        };
+
+        failedTests.push({
+          name: test.title,
+          result: false,
+          message: err.message,
+          stack: err.stack,
+          titles: flattenTitles(test)
+        });
+      };
+    };
+    mocha.checkLeaks(); // Check for global variable leaks
+  </script>
+
+  <!-- The script under test -->
+  <script src="../dist/blocking-elements.js"></script>
+
+  <!-- Tests -->
+  <script src="basic.js"></script>
+  <script src="shadow.js"></script>
+
+</body>
+
+</html>
diff --git a/test/shadow.html b/test/shadow.html
deleted file mode 100644
index 2c71611..0000000
--- a/test/shadow.html
+++ /dev/null
@@ -1,173 +0,0 @@
-<!doctype html>
-<!--
-@license
-Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
-The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
-Code distributed by Google as part of the polymer project is also
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
--->
-
-<html>
-
-<head>
-
-  <title>blockingElements shadow</title>
-  <meta charset="utf-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
-
-  <script src="../../webcomponentsjs/webcomponents-lite.js"></script>
-  <script src="../../web-component-tester/browser.js"></script>
-
-  <script src="../dist/blocking-elements.js"></script>
-
-</head>
-
-<body>
-
-  <template id="shadow-v0">
-    <button>inner button</button>
-    <content></content>
-  </template>
-
-  <template id="shadow-v1">
-    <button>inner button</button>
-    <slot></slot>
-  </template>
-
-  <test-fixture id="basic">
-    <template>
-      <div>
-        <button>button</button>
-        <button>button</button>
-        <button>button</button>
-      </div>
-    </template>
-  </test-fixture>
-
-  <script>
-    function emptyBlockingElements() {
-      while (document.$blockingElements.pop()) {
-        // keep popping!
-      }
-    }
-
-    suite('ShadowDom v0', function() {
-      if (!Element.prototype.createShadowRoot) {
-        console.log('ShadowDOM v0 is not supported by the browser.');
-        return;
-      }
-
-      let container;
-
-      setup(function() {
-        container = fixture('basic');
-        const template = document.querySelector('template#shadow-v0');
-
-        // Clone template and add it to shadow root.
-        const clone = document.importNode(template.content, true);
-        container.createShadowRoot().appendChild(clone);
-      });
-
-      teardown(function() {
-        emptyBlockingElements();
-      });
-
-      test('update elements in shadow dom', function() {
-        const shadowBtn = container.shadowRoot.querySelector('button');
-
-        // Distributed element as a blocking element.
-        document.$blockingElements.push(container.children[0]);
-        assert.equal(document.$blockingElements.top, container.children[0]);
-        assert.isTrue(shadowBtn.inert, 'button in shadow dom inert');
-        assert.isNotOk(container.children[0].inert, '1st child active');
-        assert.isTrue(container.children[1].inert, '2nd child inert');
-        assert.isTrue(container.children[2].inert, '3rd child inert');
-
-        // Button in shadow dom as a blocking element, its siblings should be inert
-        document.$blockingElements.push(shadowBtn);
-        assert.isTrue(document.$blockingElements.has(container.children[0]), '1st child is a blocking element');
-        assert.equal(document.$blockingElements.top, shadowBtn);
-        assert.isNotOk(shadowBtn.inert, 'button in shadow dom active');
-        assert.isTrue(shadowBtn.nextElementSibling.inert, 'button sibling (slot) inert');
-        assert.isNotOk(container.children[0].inert, '1st child inert restored');
-        assert.isNotOk(container.children[1].inert, '2nd child inert restored');
-        assert.isNotOk(container.children[2].inert, '3rd child inert restored');
-      });
-
-      test('push() adds only elements contained in document', function() {
-        assert.equal(document.$blockingElements.top, null);
-        // We remove the container, then we try to add one of its shadowRoot children.
-        container.parentNode.removeChild(container);
-        assert.throws(function() {
-          document.$blockingElements.push(container.shadowRoot.firstElementChild);
-        }, 'Non-connected element cannot be a blocking element');
-        assert.equal(document.$blockingElements.top, null, 'element is not a blocking element');
-      });
-
-    });
-
-    suite('ShadowDom v1', function() {
-      if (!Element.prototype.attachShadow) {
-        console.log('ShadowDOM v1 is not supported by the browser.');
-        return;
-      }
-
-      let container;
-
-      setup(function(done) {
-        container = fixture('basic');
-        const template = document.querySelector('template#shadow-v1');
-
-        // Clone template and add it to shadow root.
-        const clone = document.importNode(template.content, true);
-        container.attachShadow({
-          mode: 'open'
-        }).appendChild(clone);
-        // Needed by ShadowDOM polyfill.
-        setTimeout(function(){ done(); });
-      });
-
-      teardown(function() {
-        emptyBlockingElements();
-      });
-
-      test('update elements in shadow dom', function() {
-        const shadowBtn = container.shadowRoot.querySelector('button');
-
-        // Distributed element as a blocking element.
-        document.$blockingElements.push(container.children[0]);
-        assert.equal(document.$blockingElements.top, container.children[0]);
-        assert.isTrue(shadowBtn.inert, 'button in shadow dom inert');
-        assert.isNotOk(container.children[0].inert, '1st child active');
-        assert.isTrue(container.children[1].inert, '2nd child inert');
-        assert.isTrue(container.children[2].inert, '3rd child inert');
-
-        // Button in shadow dom as a blocking element, its siblings should be inert
-        document.$blockingElements.push(shadowBtn);
-        assert.isTrue(document.$blockingElements.has(container.children[0]), '1st child is a blocking element');
-        assert.equal(document.$blockingElements.top, shadowBtn);
-        assert.isNotOk(shadowBtn.inert, 'button in shadow dom active');
-        assert.isTrue(shadowBtn.nextElementSibling.inert, 'button sibling (slot) inert');
-        assert.isNotOk(container.children[0].inert, '1st child inert restored');
-        assert.isNotOk(container.children[1].inert, '2nd child inert restored');
-        assert.isNotOk(container.children[2].inert, '3rd child inert restored');
-      });
-
-      test('push() adds only elements contained in document', function() {
-        assert.equal(document.$blockingElements.top, null);
-        // We remove the container, then we try to add one of its shadowRoot children.
-        container.parentNode.removeChild(container);
-        assert.throws(function() {
-          document.$blockingElements.push(container.shadowRoot.firstElementChild);
-        }, 'Non-connected element cannot be a blocking element');
-        assert.equal(document.$blockingElements.top, null, 'element is not a blocking element');
-      });
-
-    });
-  </script>
-
-</body>
-
-</html>
diff --git a/test/shadow.js b/test/shadow.js
new file mode 100644
index 0000000..716d033
--- /dev/null
+++ b/test/shadow.js
@@ -0,0 +1,151 @@
+/**
+ * @license
+ * Copyright 2016 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+(function() {
+  var assert = chai.assert;
+  var fixtureLoader = new Fixture();
+  /* eslint-disable require-jsdoc */
+
+  function emptyBlockingElements() {
+    while (document.$blockingElements.pop()) {
+      // keep popping!
+    }
+  }
+
+  describe('ShadowDom v0', function() {
+    if (!Element.prototype.createShadowRoot) {
+      console.log('ShadowDOM v0 is not supported by the browser.');
+      return;
+    }
+
+    var container;
+
+    beforeEach(function() {
+      container = fixtureLoader.load(`
+        <div>
+          <button>button</button>
+          <button>button</button>
+          <button>button</button>
+        </div>`);
+      var template = document.createElement('template');
+      template.innerHTML = `<button>inner button</button><content></content>`;
+      container.createShadowRoot().appendChild(template.content);
+    });
+
+    afterEach(function() {
+      emptyBlockingElements();
+      fixtureLoader.destroy();
+    });
+
+    it('update elements in shadow dom', function() {
+      var shadowBtn = container.shadowRoot.querySelector('button');
+
+      // Distributed element as a blocking element.
+      document.$blockingElements.push(container.children[0]);
+      assert.equal(document.$blockingElements.top, container.children[0]);
+      assert.isTrue(shadowBtn.inert, 'button in shadow dom inert');
+      assert.isNotOk(container.children[0].inert, '1st child active');
+      assert.isTrue(container.children[1].inert, '2nd child inert');
+      assert.isTrue(container.children[2].inert, '3rd child inert');
+
+      // Button in shadow dom as a blocking element, its siblings should be inert
+      document.$blockingElements.push(shadowBtn);
+      assert.isTrue(document.$blockingElements.has(container.children[0]),
+        '1st child is a blocking element');
+      assert.equal(document.$blockingElements.top, shadowBtn);
+      assert.isNotOk(shadowBtn.inert, 'button in shadow dom active');
+      assert.isTrue(shadowBtn.nextElementSibling.inert, 'button sibling (slot) inert');
+      assert.isNotOk(container.children[0].inert, '1st child inert restored');
+      assert.isNotOk(container.children[1].inert, '2nd child inert restored');
+      assert.isNotOk(container.children[2].inert, '3rd child inert restored');
+    });
+
+    it('push() adds only elements contained in document', function() {
+      assert.equal(document.$blockingElements.top, null);
+      // We remove the container, then we try to add one of its shadowRoot children.
+      container.parentNode.removeChild(container);
+      assert.throws(function() {
+        document.$blockingElements.push(container.shadowRoot.firstElementChild);
+      }, 'Non-connected element cannot be a blocking element');
+      assert.equal(document.$blockingElements.top, null, 'element is not a blocking element');
+    });
+  });
+
+  describe('ShadowDom v1', function() {
+    if (!Element.prototype.attachShadow) {
+      console.log('ShadowDOM v1 is not supported by the browser.');
+      return;
+    }
+
+    var container;
+
+    beforeEach(function(done) {
+      container = fixtureLoader.load(`
+        <div>
+          <button>button</button>
+          <button>button</button>
+          <button>button</button>
+        </div>`);
+      var template = document.createElement('template');
+      template.innerHTML = `<button>inner button</button><slot></slot>`;
+      container.attachShadow({
+        mode: 'open',
+      }).appendChild(template.content);
+      // Needed by ShadowDOM polyfill.
+      setTimeout(function() {
+        done();
+      });
+    });
+
+    afterEach(function() {
+      emptyBlockingElements();
+      fixtureLoader.destroy();
+    });
+
+    it('update elements in shadow dom', function() {
+      var shadowBtn = container.shadowRoot.querySelector('button');
+
+      // Distributed element as a blocking element.
+      document.$blockingElements.push(container.children[0]);
+      assert.equal(document.$blockingElements.top, container.children[0]);
+      assert.isTrue(shadowBtn.inert, 'button in shadow dom inert');
+      assert.isNotOk(container.children[0].inert, '1st child active');
+      assert.isTrue(container.children[1].inert, '2nd child inert');
+      assert.isTrue(container.children[2].inert, '3rd child inert');
+
+      // Button in shadow dom as a blocking element, its siblings should be inert
+      document.$blockingElements.push(shadowBtn);
+      assert.isTrue(document.$blockingElements.has(container.children[0]),
+        '1st child is a blocking element');
+      assert.equal(document.$blockingElements.top, shadowBtn);
+      assert.isNotOk(shadowBtn.inert, 'button in shadow dom active');
+      assert.isTrue(shadowBtn.nextElementSibling.inert, 'button sibling (slot) inert');
+      assert.isNotOk(container.children[0].inert, '1st child inert restored');
+      assert.isNotOk(container.children[1].inert, '2nd child inert restored');
+      assert.isNotOk(container.children[2].inert, '3rd child inert restored');
+    });
+
+    it('push() adds only elements contained in document', function() {
+      assert.equal(document.$blockingElements.top, null);
+      // We remove the container, then we try to add one of its shadowRoot children.
+      container.parentNode.removeChild(container);
+      assert.throws(function() {
+        document.$blockingElements.push(container.shadowRoot.firstElementChild);
+      }, 'Non-connected element cannot be a blocking element');
+      assert.equal(document.$blockingElements.top, null, 'element is not a blocking element');
+    });
+  });
+})();