requestFullscreen

The requestFullscreen API is a web technology that allows a web page to request that the browser enter fullscreen mode. This means the entire browser window will be used to display the web content, with no toolbars, scrollbars, or other browser interface elements visible. This is commonly used for media players, games, and presentations to provide an immersive viewing experience.

To use requestFullscreen, a user typically needs to initiate the action, often by clicking a button or pressing a key. This is a security measure to prevent malicious websites from unexpectedly taking over the user's screen. The API can be called on any HTML element, and if successful, that element and its descendants will fill the entire screen. The browser will then display a visual indicator that the page is in fullscreen mode, and the user can exit fullscreen mode by pressing the Escape key or by programmatically calling the exitFullscreen method.

The requestFullscreen API has support across most modern web browsers, though there may be slight differences in implementation or prefixes required. It is part of the larger Fullscreen API specification, which also defines properties and methods for checking fullscreen status and handling fullscreen change events. Developers can use JavaScript to detect when an element enters or exits fullscreen, allowing for dynamic adjustments to the user interface.