If you have a JS fiddle, you can open it in fullscreen by appending /show to the URL.
/show
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Example: https://jsfiddle.net/b275g910/3 => https://jsfiddle.net/b275g910/3/show
https://jsfiddle.net/b275g910/3
https://jsfiddle.net/b275g910/3/show