194192 2019-02-02 06:09:30 -0800 margin of a child is not collapsed at the end of a height:100% element 2022-07-01 15:48:54 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified RESOLVED CONFIGURATION CHANGED P2 Normal --- 1 xidorn-webkit webkit-unassigned bfulgham emilio simon.fraser zalan oldest_to_newest 1501488 0 360977 xidorn-webkit 2019-02-02 06:09:30 -0800 Created attachment 360977 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 1880230 1 bfulgham 2022-07-01 15:48:54 -0700 We match Chrome behavior in macOS 13 (and probably previous to that). 360977 2019-02-02 06:09:30 -0800 2019-02-02 06:09:30 -0800 testcase 1524656.html text/html 353 xidorn-webkit PCFET0NUWVBFIGh0bWw+CjxodG1sPgo8aGVhZD4KPG1ldGEgY2hhcnNldD0iVVRGLTgiPgo8c3R5 bGU+CiAgaHRtbCB7IG91dGxpbmU6IDFweCBkb3R0ZWQgYmx1ZTsgfQogIC5oZWlnaHQgeyBoZWln aHQ6IDEwMCU7IG91dGxpbmU6IDFweCBzb2xpZCAjMDAwOyB9CiAgLm1hcmdpbmJvdHRvbSB7IG1h cmdpbjogMjBweDsgfQo8L3N0eWxlPgo8L2hlYWQ+Cjxib2R5PgogIDxkaXYgY2xhc3M9ImhlaWdo dCI+CiAgICA8ZGl2IGNsYXNzPSJtYXJnaW5ib3R0b20iPkNocm9tZSBzaG93cyAyMHB4IG1hcmdp biB1bmRlciB0aGlzIHRleHQsIEZpcmVmb3ggZG9lcyBub3QuPC9kaXY+CiAgPC9kaXY+CjwvYm9k eT4KPC9odG1sPgo=