[Webkit-unassigned] [Bug 160075] New: Support for multiple alignment values for tabular columnalign and rowalign attributes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160075

            Bug ID: 160075
           Summary: Support for multiple alignment values for tabular
                    columnalign and rowalign attributes
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
               URL: https://www.w3.org/TR/MathML/chapter3.html#presm.tabma
                    t
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: MathML
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
                CC: alex at igalia.com, distler at golem.ph.utexas.edu,
                    rego at igalia.com

Created attachment 284310
  --> https://bugs.webkit.org/attachment.cgi?id=284310&action=review
Testcase columnalign

Our columnalign and rowalign support currently relies on the following CSS rules:

/* Use inline-block for children so that the text-align property is taken into account */
mtd > * {
    display: inline-block;
}

mtable[columnalign="left"], mtr[columnalign="left"], mtd[columnalign="left"] {
    text-align: left;
}

mtable[columnalign="right"], mtr[columnalign="right"], mtd[columnalign="right"] {
    text-align: right;
}

mtable[rowalign="top"] mtd, mtable mtr[rowalign="top"] mtd, mtable mtr mtd[rowalign="top"] {
    vertical-align: top;
}

mtable[rowalign="bottom"] mtd, mtable mtr[rowalign="bottom"] mtd, mtable mtr mtd[rowalign="bottom"] {
    vertical-align: bottom;
}

mtable[rowalign="center"] mtd, mtable mtr[rowalign="center"] mtd, mtable mtr mtd[rowalign="center"] {
    vertical-align: middle;
}

These only handle the basic cases. MathML tables are closer to LaTeX than to HTML and allows multiple alignment rules to be specified in a single attribute.

I'm attaching a testcase from Mozilla's testsuite demonstrating the issue. More can be found at https://dxr.mozilla.org/mozilla-central/source/layout/reftests/mathml/

I think the case of columnalign is particularly important for aligned equations. I noticed it on Wikipedia and Jacques Distler reported the issue too for itex2MML/Instiki.

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