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Here's a piece of MathML that breaks the parser:
<mathxmlns="http://www.w3.org/1998/Math/MathML"display="block"> <semantics> <mrow> <mrow> <mtext>Mass of electron</mtext> <mo>=</mo> <mn>1.602</mn> <mspacewidth="0.2em" /> <mo>×</mo> <mspacewidth="0.2em" /> <msup> <mrow> <mn>10</mn> </mrow> <mrow> <mn>−19</mn> </mrow> </msup> <mspacewidth="0.2em" /> <mtext>C</mtext> <mspacewidth="0.2em" /> <mo>×</mo> <mspacewidth="0.4em" /> <mfrac> <mrow> <mn>1</mn> <mspacewidth="0.2em" /> <mtext>kg</mtext> </mrow> <mrow> <mn>1.759</mn> <mspacewidth="0.2em" /> <mo>×</mo> <mspacewidth="0.2em" /> <msup> <mrow> <mn>10</mn> </mrow> <mrow> <mn>11</mn> </mrow> </msup> <mspacewidth="0.2em" /> <mtext>C</mtext> </mrow> </mfrac> <mspacewidth="0.2em" /> <mo>=</mo> <mn>9.107</mn> <mspacewidth="0.2em" /> <mo>×</mo> <mspacewidth="0.2em" /> <msup> <mrow> <mn>10</mn> </mrow> <mrow> <mn>−31</mn> </mrow> </msup> <mspacewidth="0.2em" /> <mtext>kg</mtext> </mrow> </mrow> <annotation-xmlencoding="MathML-Content"> <mrow><mtext>Mass of electron</mtext><mo>=</mo><mn>1.602</mn><mspacewidth="0.2em"></mspace><mo>×</mo><mspacewidth="0.2em"></mspace><msup><mrow><mn>10</mn></mrow><mrow><mn>−19</mn></mrow></msup><mspacewidth="0.2em"></mspace><mtext>C</mtext><mspacewidth="0.2em"></mspace><mo>×</mo><mspacewidth="0.4em"></mspace><mfrac><mrow><mn>1</mn><mspacewidth="0.2em"></mspace><mtext>kg</mtext></mrow><mrow><mn>1.759</mn><mspacewidth="0.2em"></mspace><mo>×</mo><mspacewidth="0.2em"></mspace><msup><mrow><mn>10</mn></mrow><mrow><mn>11</mn></mrow></msup><mspacewidth="0.2em"></mspace><mtext>C</mtext></mrow></mfrac><mspacewidth="0.2em"></mspace><mo>=</mo><mn>9.107</mn><mspacewidth="0.2em"></mspace><mo>×</mo><mspacewidth="0.2em"></mspace><msup><mrow><mn>10</mn></mrow><mrow><mn>−31</mn></mrow></msup><mspacewidth="0.2em"></mspace><mtext>kg</mtext></mrow> </annotation-xml> </semantics></math>
When I pass it tohtml5lib.parse I get the following traceback:
.../html5lib/html5parser.pyc in mainLoop(self) 173 (currentNodeNamespace == namespaces["mathml"] and 174 currentNodeName == "annotation-xml" and--> 175 token["name"] == "svg") or 176 (self.isHTMLIntegrationPoint(currentNode) and 177 type in (StartTagToken, CharactersToken, SpaceCharactersToken))):