Vendor-prefixed APIs in WebKit This page lists the APIs in WebKit that have vendor prefixes and the status of those APIs on the standards track. DOM Full Screen Document.webkitIsFullScreen, Document.webkitFullScreenKeyboardInputAllowed, etc HTMLVideoElement.webkitSupportsFullscreen, HTMLVideoElement.webkitDisplayingFullscreen, HTMLVideoElement.webkitEnterFullscreen, HTMLVideoElement.webkitExitFul