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document.hidden

The Document.hidden read-only property returns a Boolean value indicating if the page is considered hidden or not.

var boolean = document.hidden

document.addEventListener("visibilitychange", function() {
  console.log( document.hidden );
  // Modify behavior...
});

Specification	Status	Comment
Page Visibility (Second Edition) The definition of 'Document.hidden' in that specification.	Recommendation	Initial definition

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	33 33 13 Prefixed Prefixed Requires the vendor prefix: webkit	Yes	18 18 Since Firefox 56 it also returns `true` on Mac when the window is completely hidden by another non-translucent application. 10 — 52 Prefixed Prefixed Requires the vendor prefix: -moz-	10	12.1	7

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	Yes	Yes	Yes	18 18 Since Firefox 56 it also returns `true` on Mac when the window is completely hidden by another non-translucent application. 10 — 52 Prefixed Prefixed Requires the vendor prefix: -moz-	12.1	7	?

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https://developer.mozilla.org/en-US/docs/Web/API/document/hidden