[Webkit-unassigned] [Bug 123018] New: Implement MathML bidi

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=123018

           Summary: Implement MathML bidi
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://www.w3.org/TR/MathML3/chapter3.html#presm.bidi
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: MathML
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fred.wang at free.fr


I think just mapping the attribute "dir" (on the math, mstyle, mrow and token elements with the default math at dir=ltr) to the CSS property "direction" will make most constructions work correctly. However, some MathML constructions might need more work.

In particular, stretchy operators must be mirrored. There are Open Type MATH features to do that mirroring but using a scale transform is OK in most cases (except for things like clockwise integrals where mirroring changes the semantic).

Testcase from the Mozilla bug for the "overall directionality"
https://bug534963.bugzilla.mozilla.org/attachment.cgi?id=420334

More advanced testcase:
https://developer.mozilla.org/ar/docs/Mozilla_MathML_Project/Start

See also the MathML test suite:
http://www.w3.org/Math/testsuite/build/main/Topics/BiDi/Complex/Maghreb1-simple.xhtml

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