JS
FULLSCREEN - ENTIRE PAGE document.documentElement. requestFullscreen(); FULLSCREEN - SINGLE SECTION document.getElementById('ID'). requestFullscreen(); EXIT FULL SCREEN document.exitFullscreen();
FULLSCREEN MODE CHANGED document.addEventListener( "fullscreenchange", () => { if (document.fullscreenElement ===null) { FULLSCREEN OFF } else { FULLSCREEN ON } });
FULLSCREEN MODE ERROR document.addEventListener( "fullscreenerror", () => { DO SOMETHING });