Javascript request fullscreen is unreliable

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requestFullscreen() can not be called automatically is because of security reasons (at least in Chrome). Therefore it can only be called by an user action such as:

  • click (button, link…)
  • key (keydown, keypress…)

And if your document is contained in a frame:

  • allowfullscreen needs to be present on the <iframe> element*

* W3 Spec:
“…To prevent embedded content from going fullscreen only embedded content specifically allowed via the allowfullscreen attribute of the HTML iframe element will be able to go fullscreen. This prevents untrusted content from going fullscreen…”

Read more: W3 Spec on Fullscreen

Also mentioned by @abergmeier, on Firefox your fullscreen request must be executed within 1 second after the user-generated event was fired.

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