Canvas

Canvas is a special HTML element, and will not be recorded by rrweb by default. There are some options for recording and replaying Canvas.

Enable recording Canvas：

rrweb.record({
  emit(event) {},
  recordCanvas: true,
});

Alternatively enable image snapshot recording of Canvas at a maximum of 15 frames per second：

rrweb.record({
  emit(event) {},
  recordCanvas: true,
  sampling: {
    canvas: 15,
  },
  // optional image format settings
  dataURLOptions: {
    type: 'image/webp',
    quality: 0.6,
  },
});

Enable replaying Canvas：

const replayer = new rrweb.Replayer(events, {
  UNSAFE_replayCanvas: true,
});
replayer.play();

Enable replaying Canvas will remove the sandbox, which may cause a potential security issue.

Alternatively you can stream canvas elements via webrtc with the canvas-webrtc plugin. For more information see canvas-webrtc documentation