Have HTMLDomStrings skip node types that it can't process. (mathjax/MathJax#2662) #658
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This PR arranges for the HTMLDomStrings object to skip node types that it doesn't recognize (it can handle text, comments, and Elements). This fixes the problem reported in mathjax/MathJax#2662 where ProcessingInstructions would cause MathJax to crash.
Resolves issue mathjax/MathJax#2662.