:fullscreen
Targets an element while it is being displayed in the browser's full-screen mode (e.g., when a video or a photo is expanded to fill the whole monitor).
Quick example
video:fullscreen {
/* Keeps the background black during full-screen video playback */
background-color: black;
border: none;
}:fullscreen Browser Support
Widely available Since 2015 94% global usage
This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.
Safe to use without fallbacks.
71+
64+
16.4+
12+