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Document: exitFullscreen() method - Web APIs | MDN
A Promise
which is resolved once the user agent has
finished exiting fullscreen mode. If an error occurs while attempting to exit
fullscreen mode, the catch()
handler for the promise is called.
This example causes the current document to toggle in and out of a fullscreen
presentation whenever the mouse button is clicked within it.
document.onclick = (event) => {
if (document.fullscreenElement) {
document
.exitFullscreen()
.then(() => console.log("Document Exited from Full screen mode"))
.catch((err) => console.error(err));
} else {
document.documentElement.requestFullscreen();
}
};