[Webkit-unassigned] [Bug 200092] New: Relative urls in custom properties should resolve against the base URL of the stylesheet

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=200092

            Bug ID: 200092
           Summary: Relative urls in custom properties should resolve
                    against the base URL of the stylesheet
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bram at bramperry.com

Correctly resolve relative URLs for registered CSS custom properties.

Relative URLs in registered custom properties must resolve against the base URL of the originating stylesheet. 
Currently they resolve against the base of the document.

For instance, consider a stylesheet at /style/mystyle.css:

  --foo: url("myimage.jpg");

And a document at /index.html:

  <style>
    background-image: var(--foo);
  </style>

If the property --foo is registered with syntax <url>, then the background-image should be /style/myimage.jpg.
This is contrary to non-registered properties, in which case the background-image would be /myimage.jpg.

This used to be a bug in Chromium too, but it has been fixed: https://bugs.chromium.org/p/chromium/issues/detail?id=851490
I've borrowed the description from that bug report, as it describes the issue clearly.

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