The act of converting content from its original format into a format capable of being displayed on the web
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Detect Fullscreen Jquery

Check if the user is in full-screen – Fullscreen plugin

The Fullscreen jQuery plugin is a simple plugin that detects if a user is using full-screen.

$(window).bind("fullscreen-on", function(e) {
console.log("we're on fullscreen now");
});

As you can see, the implementation of Fullscreen is very easy.

So, where’d you use it?

For one, web applications that have additional features on full-screen.

You could also try altering the div placement, for example, by centering text when full-screen is on; or maybe you just want to showcase additional advertisements.