[Webkit-unassigned] [Bug 123348] New: [MathML] Display <merror> state when markup is invalid

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=123348

           Summary: [MathML] Display <merror> state when markup is invalid
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: MathML
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bfulgham at webkit.org


Currently, certain invalid MathML documents (such as a MathML document containing arbitrary HTML markup) is rendered improperly.  According to the MathML specification, we should be providing better error information.

>From http://www.w3.org/TR/MathML3/chapter6.html), Section 6.4 Combining MathML and Other Formats:

"In the standard schema, elements from other namespaces are not allowed, but attributes from other namespaces are permitted. MathML processors that encounter unknown XML markup should behave as follows:

An attribute from a non-MathML namespace should be silently ignored.
An element from a non-MathML namespace should be treated as an error, except in an annotation-xml element. If the element is a child of a presentation element, it should be handled as described in Section 3.3.5 Error Message <merror>. If the element is a child of a content element, it should be handled as described in Section 4.2.9 Error Markup <cerror>.

For example, if the second child of an mfrac element is an unknown element, the fraction should be rendered with a denominator that indicates the error."

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