[Webkit-unassigned] [Bug 194192] New: margin of a child is not collapsed at the end of a height:100% element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194192

            Bug ID: 194192
           Summary: margin of a child is not collapsed at the end of a
                    height:100% element
           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: xidorn-webkit at upsuper.org
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 360977

  --> https://bugs.webkit.org/attachment.cgi?id=360977&action=review

testcase

Open the attached testcase. The margin should be outside the box due to margin collapse.

This happens when the container has height:100%, but doesn't when it's height:auto. Per spec, it doesn't make sense.

This is filed as a webcompat issue to Firefox, see https://bugzilla.mozilla.org/show_bug.cgi?id=1524656

I have also filed a bug to Blink: https://bugs.chromium.org/p/chromium/issues/detail?id=928027

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