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Returns true while the window's toplevel browsing context is full-screen and not in a "keys disabled" state.
==== fullScreenEnabled attribute ====
New DOM attribute of Document:
* readonly attribute boolean fullScreenEnabled
Returns true if requests for full-screen in the current document are likely to not be denied because of security or UA constraints. Typically this means all containing frames have the allowfullscreen attribute present.
=== Element additions ===
