[Webkit-unassigned] [Bug 255736] New: [margin-trim][block layout] self-collapsing children at block-end don't have nested content trimmed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255736

            Bug ID: 255736
           Summary: [margin-trim][block layout] self-collapsing children
                    at block-end don't have nested content trimmed
           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: sgill26 at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

If you have a block structure that is something similar to the following:

<container>
    <item style="margin-bottom: 10px"></item>
    <item style="margin-bottom: 10px; height: 0px;">
        <item style="margin-bottom: 10px; height: 0px;">
            <item style="margin-bottom: 10px; height: 0px;">
                <item style="margin-bottom: 10px; height: 0px;"></item>
                <item style="margin-bottom: 10px; height: 0px;"></item>
            </item>
        </item>
    </item>
</container>

We currently trim the last child, which is self collapsing, and its margins correctly, but none of the children nested within it are trimmed. Since these are at the block-end and we trim  the margins that are collapsed through for the container, none of the inner margins end up participating in margin collapsing with the container's margin and renderings look correct. However, with the tests added as a part of 253610 we can actually see that these margins are not trimmed by looking at the computed style values.

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