diff --git a/package.json b/package.json
index fbd6d138..e8f5e0b7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@highlight-run/rrweb",
-  "version": "1.1.11",
+  "version": "1.1.12",
   "description": "record and replay the web",
   "scripts": {
     "test": "npm run bundle:browser && cross-env TS_NODE_CACHE=false TS_NODE_FILES=true mocha -r ts-node/register -r ignore-styles -r jsdom-global/register test/**.test.ts",
diff --git a/src/plugins/sequential-id/record/index.ts b/src/plugins/sequential-id/record/index.ts
new file mode 100644
index 00000000..a4398311
--- /dev/null
+++ b/src/plugins/sequential-id/record/index.ts
@@ -0,0 +1,31 @@
+import { RecordPlugin } from '../../../types';
+
+export type SequentialIdOptions = {
+  key: string;
+};
+
+const defaultOptions: SequentialIdOptions = {
+  key: '_sid',
+};
+
+export const PLUGIN_NAME = 'rrweb/sequential-id@1';
+
+export const getRecordSequentialIdPlugin: (
+  options?: Partial<SequentialIdOptions>,
+) => RecordPlugin = (options) => {
+  const _options = options
+    ? Object.assign({}, defaultOptions, options)
+    : defaultOptions;
+  let id = 0;
+
+  return {
+    name: PLUGIN_NAME,
+    eventProcessor(event) {
+      Object.assign(event, {
+        [_options.key]: ++id,
+      });
+      return event;
+    },
+    options: _options,
+  };
+};
diff --git a/src/plugins/sequential-id/replay/index.ts b/src/plugins/sequential-id/replay/index.ts
new file mode 100644
index 00000000..852a02cf
--- /dev/null
+++ b/src/plugins/sequential-id/replay/index.ts
@@ -0,0 +1,39 @@
+import type { SequentialIdOptions } from '../record';
+import { ReplayPlugin, eventWithTime } from '../../../types';
+
+type Options = SequentialIdOptions & {
+  warnOnMissingId: boolean;
+};
+
+const defaultOptions: Options = {
+  key: '_sid',
+  warnOnMissingId: true,
+};
+
+export const getReplaySequentialIdPlugin: (
+  options?: Partial<Options>,
+) => ReplayPlugin = (options) => {
+  const { key, warnOnMissingId } = options
+    ? Object.assign({}, defaultOptions, options)
+    : defaultOptions;
+  let currentId = 1;
+
+  return {
+    handler(event: eventWithTime) {
+      if (key in event) {
+        const id = ((event as unknown) as Record<string, number>)[key];
+        if (id !== currentId) {
+          console.error(
+            `[sequential-id-plugin]: expect to get an id with value "${currentId}", but got "${id}"`,
+          );
+        } else {
+          currentId++;
+        }
+      } else if (warnOnMissingId) {
+        console.warn(
+          `[sequential-id-plugin]: failed to get id in key: "${key}"`,
+        );
+      }
+    },
+  };
+};
diff --git a/src/record/index.ts b/src/record/index.ts
index 63881230..01a9cb58 100644
--- a/src/record/index.ts
+++ b/src/record/index.ts
@@ -122,6 +122,17 @@ function record<T = eventWithTime>(
 
   let lastFullSnapshotEvent: eventWithTime;
   let incrementalSnapshotCount = 0;
+  const eventProcessor = (e: eventWithTime): T => {
+    for (const plugin of plugins || []) {
+      if (plugin.eventProcessor) {
+        e = plugin.eventProcessor(e);
+      }
+    }
+    if (packFn) {
+      e = (packFn(e) as unknown) as eventWithTime;
+    }
+    return (e as unknown) as T;
+  };
   wrappedEmit = (e: eventWithTime, isCheckout?: boolean) => {
     if (
       mutationBuffers[0]?.isFrozen() &&
@@ -136,7 +147,7 @@ function record<T = eventWithTime>(
       mutationBuffers.forEach((buf) => buf.unfreeze());
     }
 
-    emit(((packFn ? packFn(e) : e) as unknown) as T, isCheckout);
+    emit(eventProcessor(e), isCheckout);
     if (e.type === EventType.FullSnapshot) {
       lastFullSnapshotEvent = e;
       incrementalSnapshotCount = 0;
@@ -417,20 +428,22 @@ function record<T = eventWithTime>(
           shadowDomManager,
           canvasManager,
           plugins:
-            plugins?.map((p) => ({
-              observer: p.observer,
-              options: p.options,
-              callback: (payload: object) =>
-                wrappedEmit(
-                  wrapEvent({
-                    type: EventType.Plugin,
-                    data: {
-                      plugin: p.name,
-                      payload,
-                    },
-                  }),
-                ),
-            })) || [],
+            plugins
+              ?.filter((p) => p.observer)
+              ?.map((p) => ({
+                observer: p.observer!,
+                options: p.options,
+                callback: (payload: object) =>
+                  wrappedEmit(
+                    wrapEvent({
+                      type: EventType.Plugin,
+                      data: {
+                        plugin: p.name,
+                        payload,
+                      },
+                    }),
+                  ),
+              })) || [],
           enableStrictPrivacy,
         },
         hooks,
diff --git a/src/types.ts b/src/types.ts
index 4f161d94..3cd5af61 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -213,7 +213,8 @@ export type SamplingStrategy = Partial<{
 
 export type RecordPlugin<TOptions = unknown> = {
   name: string;
-  observer: (cb: Function, win: IWindow, options: TOptions) => listenerHandler;
+  observer?: (cb: Function, win: IWindow, options: TOptions) => listenerHandler;
+  eventProcessor?: <TExtend>(event: eventWithTime) => eventWithTime & TExtend;
   options: TOptions;
 };
 
diff --git a/src/utils.ts b/src/utils.ts
index b94fe97c..ab8d3462 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -232,7 +232,11 @@ export function isBlocked(node: Node | null, blockClass: blockClass): boolean {
   if (node.nodeType === node.ELEMENT_NODE) {
     let needBlock = false;
     if (typeof blockClass === 'string') {
-      needBlock = (node as HTMLElement).classList.contains(blockClass);
+      if ((node as HTMLElement).closest !== undefined) {
+        return (node as HTMLElement).closest('.' + blockClass) !== null;
+      } else {
+        needBlock = (node as HTMLElement).classList.contains(blockClass);
+      }
     } else {
       (node as HTMLElement).classList.forEach((className) => {
         if (blockClass.test(className)) {