[Webkit-unassigned] [Bug 154669] New: CSS.supports returns false for custom properties

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=154669

            Bug ID: 154669
           Summary: CSS.supports returns false for custom properties
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: 50167214 at qq.com

1. Run CSS.supports('--foo', 'red') on the JavaScript console

What is the expected result?
true getting logged in the console

What happens instead?
false getting logged in the console

As custom properties (aka CSS variables) are now supported in Chromium, CSS.supports('--foo', 'red') should return true.
The alternative method signature using a conditionText works already correct and returns true for CSS.supports('(--foo: red)')

The related specification can be found here: 
https://drafts.csswg.org/css-conditional-3/#the-css-interface

See also: https://crbug.com/584683(Blink fixed)

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