Reviewed by Maciej Stachowiak.

        Basic tests for msub, msup, and mtable/mtr/mtd

        * mathml: Added.
        * mathml/presentation: Added.
        * mathml/presentation/sub.xhtml: Added.
        * mathml/presentation/sup.xhtml: Added.
        * mathml/presentation/tables.xhtml: Added.
        * platform/mac/mathml: Added.
        * platform/mac/mathml/presentation: Added.
        * platform/mac/mathml/presentation/sub-expected.txt: Added.
        * platform/mac/mathml/presentation/sup-expected.txt: Added.
        * platform/mac/mathml/presentation/tables-expected.txt: Added.
2009-09-19  Alex Milowski  <alex@milowski.com>

        Reviewed by Maciej Stachowiak.

        Adds CSS styling and basic DOM element support for MathML

        * DerivedSources.make:
          Added user stylesheet and tag factory generation

        * WebCore.xcodeproj/project.pbxproj:
          Added new DOM element code

        * css/CSSParser.cpp:
        (WebCore::CSSParser::parseAttr):
          Added check for document since stylesheet can be added before there is a document

        * css/CSSStyleSelector.cpp:
        (WebCore::CSSStyleSelector::styleForElement):
          Added check to add MathML user agent stylesheet

        * css/mathml.css: Added.
          MathML user agent stylesheet

        * dom/Document.cpp:
        (WebCore::Document::createElement):
          Added support for creation of MathML DOM objects

        * dom/Node.h:
        (WebCore::Node::isMathMLElement):
          Added check method for whether the node is a MathML node

        * mathml: Added.
        * mathml/MathMLElement.cpp: Added.
        (WebCore::MathMLElement::MathMLElement):
        (WebCore::MathMLElement::create):
        (WebCore::MathMLElement::createRenderer):
        * mathml/MathMLElement.h: Added.
        (WebCore::MathMLElement::isMathMLElement):
          MathML DOM base class

        * mathml/MathMLInlineContainerElement.cpp: Added.
        (WebCore::MathMLInlineContainerElement::MathMLInlineContainerElement):
        (WebCore::MathMLInlineContainerElement::create):
        (WebCore::MathMLInlineContainerElement::createRenderer):
        * mathml/MathMLInlineContainerElement.h: Added.
          Base class for non-text containers

        * mathml/MathMLMathElement.cpp: Added.
        (WebCore::MathMLMathElement::MathMLMathElement):
        (WebCore::MathMLMathElement::create):
        * mathml/MathMLMathElement.h: Added.
          Root Math element

        * mathml/mathtags.in: Added.
          Element list mappings

        * page/Frame.cpp:
        (WebCore::Frame::Frame):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@48559 268f45cc-cd09-0410-ab3c-d52691b4dbfc