This sample demonstrates how to use the chrome.tabCapture API to record in the background, using a service worker and offscreen document.

In this sample, clicking the action button starts recording the current tab in an offscreen document. After 30 seconds, or once the action button is clicked again, the recording ends and is saved as a download.

See the Audio recording and screen capture guide for more implementation details.

1. Clone this repository.
2. Load this directory in Chrome as an unpacked extension.
3. Pin the extension from the extension menu.
4. Click the extension's action icon to start recording.
5. Click the extension's action again to stop recording.