See https://github.com/whatwg/html/pull/1252 A form in quirks mode has a block-end margin in Gecko/Edge; bottom margin in WebKit/Chromium. <style>html { writing-mode: vertical-lr } </style> x<form id=form></form>y <script> w('marginRight ' + getComputedStyle(form).marginRight); w('marginBottom ' + getComputedStyle(form).marginBottom); </script> http://software.hixie.ch/utilities/js/live-dom-viewer/saved/4197 https://github.com/WebKit/webkit/blob/master/Source/WebCore/css/quirks.css#L53
Created attachment 351255 [details] Patch
wpt PR https://github.com/web-platform-tests/wpt/pull/13292
I got the export script working now: https://github.com/web-platform-tests/wpt/pull/13293
Comment on attachment 351255 [details] Patch Clearing flags on attachment: 351255 Committed r236673: <https://trac.webkit.org/changeset/236673>
All reviewed patches have been landed. Closing bug.
<rdar://problem/44914383>