> Shouldn't there be an API for that? There is one : https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibility_API https://developer.mozilla.org/en-US/d

> Shouldn't there be an API for that? There is one : https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibility_API https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibi... Although I think it can be a privacy concern and somewhat of an anti-feature. For instance, Youtube uses that API to stop playback on mobile when the page or browser is not in the foreground. Of course, there's an extension for that ...