https://www.w3.org/Bugs/Public/show_bug.cgi?id=24232

            Bug ID: 24232
           Summary: The containing block of fixpos elements in the top
                    layer shouldn't be the ICB
           Product: WebAppsWG
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Fullscreen
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected], [email protected]

The spec says the containing block of an element in the top layer is the
initial containing block. However, this would mean elements with fixed
positioning don't behave as such: they would be positioned relative to the
document's origin rather than the viewport's. Instead, the containing block of
fixpos elements should be the viewport, as normal.

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