[Webkit-unassigned] [Bug 244657] New: border-image-* returns the initial keyword instead of the initial value when setting border-image shorthand

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244657

            Bug ID: 244657
           Summary: border-image-* returns the initial keyword instead of
                    the initial value when setting border-image shorthand
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
               URL: http://wpt.live/css/css-backgrounds/parsing/border-ima
                    ge-shorthand.sub.html
                OS: Unspecified
            Status: NEW
          Keywords: BrowserCompat
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: karlcow at apple.com
                CC: webkit-bug-importer at group.apple.com

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

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