RESOLVED FIXED193346
[LFC][BFC][MarginCollapsing] Adjust vertical position when box margin collapses through. 
https://bugs.webkit.org/show_bug.cgi?id=193346
Summary [LFC][BFC][MarginCollapsing] Adjust vertical position when box margin collaps...
alan
Reported 2019-01-10 21:41:37 PST
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.
Attachments
Patch (18.09 KB, patch)
2019-01-10 21:53 PST, alan 		no flags
DetailsFormatted DiffDiff
Patch (18.41 KB, patch)
2019-01-11 07:45 PST, alan 		koivisto: review+
DetailsFormatted DiffDiff
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
alan
Comment 1 2019-01-10 21:53:52 PST
Created attachment 358876 [details] Patch
alan
Comment 2 2019-01-11 07:45:29 PST
Created attachment 358895 [details] Patch
alan
Comment 3 2019-01-11 08:19:48 PST
Committed r239863: <https://trac.webkit.org/changeset/239863>
Radar WebKit Bug Importer
Comment 4 2019-01-11 08:20:30 PST
<rdar://problem/47209819>
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