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This adds support for checking if fullscreen is enabled (which is more than simply checking if the API is supported and available). One example of when this differs is this will return false when an iframe does not have the
allowfullscreen
attribute.More details:
https://fullscreen.spec.whatwg.org/#dom-document-fullscreenenabled
https://fullscreen.spec.whatwg.org/#fullscreen-enabled-flag
Let me know if you'd like me to add more clarifying detail to the README!