187052 2018-06-26 10:31:10 -0700 initial keyword doesn't match initial -webkit-mask-box-image-slice and stroke-color values 2020-07-21 14:42:39 -0700 1 1 1 Unclassified WebKit CSS Safari Technology Preview Unspecified Unspecified RESOLVED DUPLICATE 213171 InRadar P2 Normal --- 1 gsnedders webkit-unassigned sam simon.fraser webkit-bug-importer youennf zalan oldest_to_newest 1436565 0 gsnedders 2018-06-26 10:31:10 -0700 Compare computed styles of <span style="all: initial; direction: initial; unicode-bidi: initial; display: inline;"> and <span>: -webkit-mask-box-image-slice: 0 (all: initial) v. 0 fill stroke-color: rgb(0, 0, 0) (all: initial) v. rgba(0, 0, 0, 0) This is unexpected, the semantics of all: initial should make the computed styles of both identical. wpt/infrastructure/assumptions/html-elements.html tests this (see "Compare CSS span definitions (only valid if pre-reqs pass)" test). 1436579 1 gsnedders 2018-06-26 10:54:14 -0700 [["-webkit-mask-box-image-slice", "0 fill"], ["stroke-color", "rgba(0, 0, 0, 0)"]].forEach(([property, initial]) => { ["", "initial", "inherit"].forEach((value) => { test(() => { const el = document.createElement("span"); document.body.appendChild(el); el.style[property] = value; const cs = window.getComputedStyle(el); assert_equals(cs[property], initial); }, property + ": " + value); }); }); shows this is actually just the initial keyword generally? Neither property has any defined value in html.css, so I don't know why there's any difference here. Note that mask-border-slice, which per Compat -webkit-mask-box-image-slice is an alias of, should per spec have an initial value of 0 (as it gets with the initial keyword!) rather than the current "0 fill". 1466800 2 webkit-bug-importer 2018-10-05 15:42:26 -0700 <rdar://problem/45057755> 1673628 3 sam 2020-07-21 14:42:39 -0700 This was fixed in r263156. Sorry for not seeing this bug when I was fixing it (and therefore the forward dupe here). *** This bug has been marked as a duplicate of bug 213171 ***