Bug 244657 – border-image-* returns the initial keyword instead of the initial value when setting border-image shorthand

• Status: RESOLVED
• Resolution: FIXED
• Component: CSS

[Karl Dubost]

Enter:

data:text/html,<div%20style="border-image:%20initial">

Then 

document.getElementsByTagName('div')[0].style.borderImageOutset
returns initial instead of 0

and so on the other properties.

document.getElementsByTagName('div')[0].style.borderImageRepeat
returns initial instead of stretch

etc.

see the tests in http://wpt.live/css/css-backgrounds/parsing/border-image-shorthand.sub.html

and 

https://searchfox.org/wubkat/rev/482480f60b1f8c26dfe99b670a5fe677abb0fcd8/Source/WebCore/css/parser/CSSPropertyParser.cpp#5645-5677

https://searchfox.org/wubkat/search?q=symbol:_ZN7WebCore12CSSValuePool26createImplicitInitialValueEv&redirect=false

[Radar WebKit Bug Importer]

<rdar://problem/99420050>

[Darin Adler]

All uses of createImplicitInitialValue have this problem.

[Darin Adler]

I started working on this and I am sort of falling down a rabbit hole, since there is so much here that can be improved.

[Darin Adler]

Pull request: https://github.com/WebKit/WebKit/pull/6652

[Darin Adler]

Scaled back my ambition in this particular bug to just the two border-image shorthands, rather than all the other uses of createImplicitInitialValue, which likely each create a similar problem.

[EWS]

Committed 257119@main (c0c6ad146d33): <https://commits.webkit.org/257119@main>

Reviewed commits have been landed. Closing PR #6652 and removing active labels.