[Webkit-unassigned] [Bug 118738] New: Improve how the script size is determined

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=118738

           Summary: Improve how the script size is determined
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://www.w3.org/TR/2010/REC-MathML3-20101021/chapter
                    3.html#presm.scriptlevel
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: MathML
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fred.wang at free.fr


Currently the script size is determined by the following CSS rule in WebCore/css/mathml.css:

msub > * + *, msup > * + *, msubsup > * + *, munder > * + *, mover > * + *, munderover > * + * {
    font-size: 0.75em; /* FIXME: MathML standard is 0.71em */
}

The MathML specification describes a more complicated way to compute that size using the scriptlevel, scriptminsize and  scriptsizemultiplier attributes. In Gecko these are implemented in the text rendering using private -moz-* CSS properties and then these properties are set by the MathML code. Some elements like scripts, fractions or roots increment the scriptlevel (the exact rules rely on the displaystyle value, see bug 118737).

See also bucket 3 of the MathML Acid3 tests:
http://fred-wang.github.io/AcidTestsMathML/acid3/d
http://fred-wang.github.io/AcidTestsMathML/acid3/description.html

and chapter 3 of the MathML spec for details:
http://www.w3.org/TR/2010/REC-MathML3-20101021/chapter3.html

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