[Webkit-unassigned] [Bug 281206] New: Disable some legacy MathML attributes and values in all ports

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=281206

            Bug ID: 281206
           Summary: Disable some legacy MathML attributes and values in
                    all ports
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: MathML
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
                CC: ahmad.saleem792 at gmail.com
        Depends on: 196142, 197493, 197494, 197495
            Blocks: 195797

The following legacy features are implemented in WebKit but are not available in any other browser for a while:

- numalign/denomalign attributes (*)
- mfrac's linethickness values: thin, medium, thick values (*)
- nonzero unitless values (e.g. 5 to mean 500%) for MathML lengths (*)
- subscriptshift/superscriptshift attributes.
- mstyle attributes: background, color, fontsize, fontstyle, fontweight
- mathsize values: small, normal, big (*)

The features marked as (*) can be disabled via https://searchfox.org/wubkat/rev/168430191bc069c153b23fdddfc818adea1f2992/Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml#2062. On WPE/GTK, we already disable them by default but we might consider doing that for all ports. Be aware though that this preference also disables more things such as named spaces (see https://searchfox.org/wubkat/rev/168430191bc069c153b23fdddfc818adea1f2992/Source/WebCore/mathml/MathMLPresentationElement.cpp#197).

Some WPT tests (probably non-exhaustive):

  - https://wpt.fyi/results/mathml/presentation-markup/fractions/frac-numalign-denomalign-001.html
  - https://wpt.fyi/results/mathml/presentation-markup/fractions/frac-linethickness-001.html
  - https://wpt.fyi/results/mathml/relations/css-styling/lengths-1.html
  - https://wpt.fyi/results/mathml/relations/css-styling/lengths-2.html
  - https://wpt.fyi/results/mathml/presentation-markup/scripts/subsup-legacy-scriptshift-attributes-001.tentative.html
  - https://wpt.fyi/results/mathml/relations/css-styling/attribute-mapping-001.html


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=195797
[Bug 195797] Align WebKit's MathML implementation with the MathML Core spec
https://bugs.webkit.org/show_bug.cgi?id=196142
[Bug 196142] [GTK][WPE] Disable "thin", "thick", "medium" values of mfrac at linethickness at runtime
https://bugs.webkit.org/show_bug.cgi?id=197493
[Bug 197493] [GTK][WPE] Remove keyword values for mathsize
https://bugs.webkit.org/show_bug.cgi?id=197494
[Bug 197494] [GTK][WPE] Remove support for named spaces and nonzero unitless lengths
https://bugs.webkit.org/show_bug.cgi?id=197495
[Bug 197495] [GTK][WPE] Remove support for numalign/denomalign attributes
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