-webkit-margin-collpase is a non-standard extension added in https://trac.webkit.org/changeset/7362/webkit. I wonder if we can remove it.
There's a mention here: https://stackoverflow.com/questions/11046596/collapsing-margin-on-legend-tag Chrome usage counting: https://www.chromestatus.com/metrics/css/timeline/popularity/269 This probably over-counts, according to Ian K.
*** Bug 204956 has been marked as a duplicate of this bug. ***
Just for future reference, this is the comment from ikilpatrick@ on the duplicated bug: Blink is going to attempt to remove this in the M81 release, see: https://bugs.chromium.org/p/chromium/issues/detail?id=1030765 https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/ewWQH9vEqtI/L2r2WFhPBAAJ
Created attachment 447936 [details] Patch
Created attachment 447939 [details] Patch
Created attachment 447943 [details] Patch
Comment on attachment 447943 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=447943&action=review > LayoutTests/ChangeLog:3 > + Rqa"§emove non-standard -webkit-margin-collapse CSS property and longhands nit: fix commit message here
Created attachment 447944 [details] Patch
Committed r287429 (245564@trunk): <https://commits.webkit.org/245564@trunk>
<rdar://problem/86895519>