https://www.w3.org/Bugs/Public/show_bug.cgi?id=26493

            Bug ID: 26493
           Summary: Null dereference in exitFullscreen()
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Fullscreen
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected], [email protected]

In both of these steps, doc can be null:

3.4.3. Remove the top element of doc's fullscreen element stack.

3.5. Let topLevelDoc be doc's top-level browsing context's document.

It looks like "and to null otherwise" could be replaced by the equivalent of
"break" and then lastDoc can go as well.

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