document.fullscreen

The Document.fullscreen read-only property reports whether or not the document is currently displaying content in fullscreen mode.

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.

Syntax

var isFullScreen = document.fullscreen;

Return value

• A Boolean that is true if the document is being displayed in fullscreen mode; otherwise it's false.

Example

function isDocumentInFullScreenMode() {
  // Better: use fullscreenElement method!
  return document.fullscreen;  
}

Specifications

Browser compatibility

See also

• Using fullscreen mode
• Document.fullscreenEnabled