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Switch browser to fullscreen mode with JavaScript

Question:
How to switch browser to fullscreen mode with JavaScript?
Answer:
document.documentElement.requestFullscreen();
Description:

You can switch your browser to full-screen mode by pressing the F11 key on your keyboard. However, not all users know this keyboard shortcut so it can be helpful in some cases to put a dedicated button on your webpage that allows to user to switch to full screen mode.

Modern desktop browsers support the Fullscreen API that allows entering to and exit from full-screen mode. 

Use requestFullscreen() method on an element (and not on document) to put the element into fullscreen.

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