[Webkit-unassigned] [Bug 115787] New: Implement MathML spacing around operators

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=115787

           Summary: Implement MathML spacing around operators
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: MathML
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fred.wang at free.fr


The WebCore/css/mathml.css stylesheet contains the following comment:

/* FIXME: For a RenderMathMLOperator's margin-start and margin-end, or for a MathML "embellished operator", check the operator's lspace and rspace attributes,
   and the MathML operator dictionary. */
math > mo, mrow > mo, msqrt > mo, mtd > mo {
    -webkit-margin-start: 0.2em;
    -webkit-margin-end: 0.2em;
}

basically, we always add .2em before and after the <mo> element. We should use the default lspace/rspace values given in MathML operator dictionary instead:

http://www.w3.org/TR/MathML/appendixc.html#oper-dict.entries-table

which are multiple of 1/18em:

http://www.w3.org/TR/MathML/appendixc.html#oper-dict.space

Also, the we could use the lspace/rspace attribute valus when specified:

http://www.w3.org/TR/MathML/chapter3.html#presm.mo.attrs

In theory, the spacing should be added to around the whole embellished operators not necessarily to the core mo, but I'm not sure how much Webkit implements about the embellished operator hierarchy.

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