[Webkit-unassigned] [Bug 129144] New: Disallow the use of -webkit-user-modify on shadow pseudo elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=129144

           Summary: Disallow the use of -webkit-user-modify on shadow
                    pseudo elements
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: darin at apple.com, ap at webkit.org, sam at webkit.org,
                    koivisto at iki.fi, enrica at apple.com, akling at apple.com,
                    eoconnor at apple.com
            Blocks: 129034


It's a terrible idea to let authors override the editability of UA shadow DOM via -webkit-user-modify.
In fact, we already have a bunch of -webkit-user-modify: read-only !important rules in html.css.

In order to resolve the bug 129034, completely disallow them in all cases in the engine itself.

Heck, we probably want to disallow -webkit-user-modify anywhere in the shadow DOM since it's a legacy CSS property
that's hurting the performance for us.

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