Automatically dim the page and highlight the video player when you click on the play button. This page is only for the developers of Turn Off the Lights to test the browser extension features. Such as the "automatically dim the page when you click on the play button", etc.
The extension can detect all the HTML5 video play status. If one of the videos is still playing, the page stays dark. This thinking is done in the Open-Source AutoPlay script file, in the Turn Off the Lights Browser extension.