Document.mozFullScreen

Reports whether or not the document is currently displaying content in fullscreen mode.

Note that the draft specification of the fullscreen API does not include a document.fullscreen attribute, and instead suggests checking whether document.fullscreenElement is non-null to determine whether the browser is in fullscreen mode. Using document.fullscreenElement to dertermine whether the browser is in fullscreen mode is recommend.

Syntax

var isFullScreen = document.mozFullScreen || document.webkitIsFullScreen;

On return, isFullScreen is true if the document is being displayed in fullscreen mode; otherwise it's false.

Example

function isDocumentInFullScreenMode() {
  // Note that the browser fullscreen (triggered by short keys) might
  // be considered different from content fullscreen when expecting a boolean
  return ((document.fullscreenElement && document.fullscreenElement !== null) ||    // alternative standard methods
      document.mozFullScreen || document.webkitIsFullScreen);                   // current working methods
}

Notes

See Using fullscreen mode for details and examples.

Specifications

Not part of any specification.

Browser compatibility

See also

• Using fullscreen mode
• element.mozRequestFullScreen()
• document.mozCancelFullScreen()
• document.mozFullScreenElement
• document.mozFullScreenEnabled
• :-moz-full-screen
• allowfullscreen