[Webkit-unassigned] [Bug 118622] New: Match spec for font-weight: bolder|lighter

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=118622

           Summary: Match spec for font-weight: bolder|lighter
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: koivisto at iki.fi, dino at apple.com, enrica at apple.com,
                    akling at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/3256e906a22349f99102fdafc4e00a0989f15dc9

Currently, bolder and lighter change font-weight in a non-compliant way
The spec (http://www.w3.org/TR/css3-fonts/#bolderlighter) defines
exactly what the computed values should be given the inherited weight
values, so we should match those.

The removed FIXME's for selecting the next lightest/heaviest weight from
the used font family seems to refer to behaviour from
CSS1 (http://www.w3.org/TR/CSS1/#font-weight), while this is replaced
with a simpler procedure for resolving bolder and lighter in font weights
in CSS2 (http://www.w3.org/TR/CSS2/fonts.html#propdef-font-weight) and
CSS3 (link above).

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