I am launching a new tab and trying to add a visibilitychange handler for the window in order to add unload behavior, since all the docs recommend that over onunload and pagehide. My plan was to at...

In ECMAscript (=Javascript) there are two ways to check if the user is away from your page or not. You can either listen for a "visibilitychange" event on the document or you can listen for "blur" ...

I was trying to use Visibility API, but it is not working for a child. The minimal example to reproduce: <script> document.onvisibilitychange = () => { console.log(document.visibilitySta...