[Webkit-unassigned] [Bug 215359] New: @font-face font-weight descriptor should reject bolder and lighter

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215359

            Bug ID: 215359
           Summary: @font-face font-weight descriptor should reject bolder
                    and lighter
           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: taken.spc at gmail.com

Both "bolder" and "lighter" are not allowed for @font-face font-weight descriptor.

https://www.w3.org/TR/css-fonts-3/#descdef-font-weight
> Name: 	font-weight
> Value: 	normal | bold | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 

https://drafts.csswg.org/css-fonts-4/#descdef-font-face-font-weight
> For: 	@font-face
> Value: 	auto | <font-weight-absolute> <font-weight-absolute>?

In WebKit, CSS parser accepts "bolder" and "lighter" and font resolver computes absolute weight from "bolder" and "lighter". This doesn't match other browsers behavior and the specs. Rejecting "bolder" and "lighter" improves interoperability and spec compliance.

WPT.fyi
https://wpt.fyi/results/css/css-fonts/variations/at-font-face-descriptors.html

Firefox's CSS parser rejects "bolder" and "lighter".
https://bugzilla.mozilla.org/show_bug.cgi?id=1454596


Chrome's CSS parser accepts "bolder" and "lighter" and its font resolver doesn't use "bolder" and "lighter" (I think it's confusing).
https://source.chromium.org/chromium/chromium/src/+/master:third_party/blink/renderer/core/css/font_face.cc;l=661-678;drc=b80faef62a12ac2966f19b014e845a8137718885

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