[Webkit-unassigned] [Bug 211933] New: CSS color function should allow fallback color

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=211933

            Bug ID: 211933
           Summary: CSS color function should allow fallback color
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nvasilyev at apple.com
                CC: jond at apple.com

color: color(display-p3 1 0 0, green)

This should show red when display-p3 is supported, and green when it isn't. Instead it shows black.

data:text/html;,<body%20style="color:color(display-p3%200%201%200,%20green)">color</body>

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https://www.w3.org/TR/css-color-4/#color-function

10.1. Specifying profiled colors: the color() function

The color() function allows a color to be specified in a particular colorspace (rather than the implicit sRGB colorspace that the other color functions operate in). Its syntax is:

color() = color( [ <ident>? [ <number>+ | <string> ] [ / <alpha-value> ]? ]# , <color>? )
The color function takes one or more comma-separated arguments, with each argument specifying a color, and later colors acting as "fallback" if an earlier color can’t be displayed (for example, if the colorspace it specifies hasn’t been loaded yet).

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