Make sure we get the <math> element from mml3 conversion. (mathjax/MathJax#2879) #822
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It turns out that the XSLTProcessor produces different results in Firefox and Chrome, and the code that obtained the
<math>
element didn't work in both, leading to an error message aboutdiv
elements. This PR uses a more robust approach to finding the<math>
element. We know here will be one (and only one) because this runs after the initial parsing of the math string, which checks for a single<math>
element.Resolves issue mathjax/MathJax#2879.