[Webkit-unassigned] [Bug 193346] New: [LFC][BFC][MarginCollapsing] Adjust vertical position when box margin collapses through.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193346

            Bug ID: 193346
           Summary: [LFC][BFC][MarginCollapsing] Adjust vertical position
                    when box margin collapses through.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zalan at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

https://www.w3.org/TR/CSS22/box.html#collapsing-margins

If the top and bottom margins of a box are adjoining, then it is possible for margins to collapse through it. In this case, the position of the element depends on its relationship with the other elements whose margins are being collapsed.

If the element's margins are collapsed with its parent's top margin, the top border edge of the box is defined to be the same as the parent's.
Otherwise, either the element's parent is not taking part in the margin collapsing, or only the parent's bottom margin is involved. The position of the element's top border edge is the same as it would have been if the element had a non-zero bottom border.

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