The read-only fullscreenEnabled property on the Document interface indicates whether or not full-screen mode is available.

Full-screen mode is available only for a page that has no windowed plug-ins in any of its documents, and if all <iframe> elements which contain the document have their allowfullscreen attribute set.

Although this property is read-only, it will not throw if it is modified (even in strict mode); the setter is a no-operation and it will be ignored.


var isFullscreenAvailable = document.fullscreenEnabled;


A boolean value which is true if the document and the elements within can be placed into full-screen mode by calling Element.requestFullscreen(). If full-screen mode isn't available, this value is false.


In this example, before attempting to request full-screen mode for a <video> element, the value of fullscreenEnabled is checked, in order to avoid making the attempt when not available.

function requestFullScreen() {
  if (document.fullscreenEnabled) {
  } else {
    console.log('Your browser cannot use fullscreen right now');


Fullscreen API Standard (Fullscreen API)
# ref-for-dom-document-fullscreenenabled①

Browser compatibility

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See also