W3cubDocs

Window: fullScreen property

Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The fullScreen property of the Window interface indicates whether the window is displayed in full screen mode or not.

Value

A boolean value with true meaning that the window is in full-screen mode and false meaning it isn't.

Notes

Switching between regular window and full screen will fire the "resize" event on the corresponding window.

Examples

if (window.fullScreen) {
  // it's fullscreen!
} else {
  // not fullscreen!
}

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`fullScreen`	No	No	1	No	No	No	No	No	4	No	No	No

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https://developer.mozilla.org/en-US/docs/Web/API/Window/fullScreen