[Webkit-unassigned] [Bug 216795] New: System color 'canvas' cannot be set or read

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216795

            Bug ID: 216795
           Summary: System color 'canvas' cannot be set or read
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dpa-webkit at aegee.org

The way to obtain the default background color set by the user, is to call

function getDefaultBackgroundColor() {
  let div = document.createElement("div");
  div.style.backgroundColor = "canvas";
  document.documentElement.appendChild(div);
  let color = getComputedStyle(div).backgroundColor;
  div.remove();
  return color;
}

This does not work with WebKitGTK 2.28.1/Epiphany 3.36.4.  In particular it allows setting custom CSS, and body.background-color in it, but it is unclear how to use the Canvas keyword as calor there.

• How to configure WebKit to change the default canvas system colour, in terms of https://www.w3.org/TR/css-color-4/#css-system-colors
• Please make the snippet above work.

See also https://bugzilla.mozilla.org/show_bug.cgi?id=1666127 and https://gitlab.gnome.org/GNOME/epiphany/-/issues/1344

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