Not immediately clear to me what this is actually blocked on? Maybe we can just go ahead and unprefix with an alias?
<rdar://problem/82176202>
Ideally this would add animation support for this property in CSSPropertyAnimation. See the many uses of DiscretePropertyWrapper, this will likely be a one-liner.
According to MDN, WebKit only supports this for inline elements (like Chrome).
https://wpt.fyi/results/css/css-break?label=master&label=experimental&aligned&view=subtest&q=box-decoration-break https://searchfox.org/wubkat/rev/f78fd4847fdb47a9159a81e971c8b2af61d8d197/Source/WebCore/animation/CSSPropertyAnimation.cpp#3555-3557
So I was wondering the same. I have made a patch which solves the parsing but doesn't solve test 1, 2, and 4. https://wpt.fyi/results/css/css-break?label=master&label=experimental&aligned&q=safari%3Afail%20box-decoration-break Let's see if they are more things we could do about it.
Pull request: https://github.com/WebKit/WebKit/pull/17007