[Webkit-unassigned] [Bug 137919] New: Match spec for font-weight: bolder|lighter

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=137919

            Bug ID: 137919
           Summary: Match spec for font-weight: bolder|lighter
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tmeszaros.u-szeged at partner.samsung.com

Consider merging https://chromiumcodereview.appspot.com/15994009 and https://codereview.chromium.org/137813004 from blink to make font-weight: bolder/lighter work correctly.

Match spec for font-weight: bolder|lighter
https://chromiumcodereview.appspot.com/15994009

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).


Multiple selectors setting relative font-weight names to an element result in a cumulative result
https://codereview.chromium.org/137813004

According to http://dev.w3.org/csswg/css-fonts/#font-weight-prop, the computed
weight of 'lighter' and 'bolder' are based on the inherited 'font-weight', so set
that inherited weight before calculating 'lighter' and 'bolder'.

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