[whatwg/fullscreen] Deny request on invisible document (#60)

Fixes #58.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fullscreen/pull/60

-- Commit Summary --

  * Deny request on invisible document

-- File Changes --

    M fullscreen.bs (3)
    M fullscreen.html (4)

-- Patch Links --

https://github.com/whatwg/fullscreen/pull/60.patch
https://github.com/whatwg/fullscreen/pull/60.diff

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https://github.com/whatwg/fullscreen/pull/60