Handle undefined characters (these need measurement,so cause reflows).
Handle undefined characters (these need measurement,so cause reflows).

thomasjm/MathJax,thomasjm/MathJax,thomasjm/MathJax,GerHobbelt/MathJax,GerHobbelt/MathJax,jinntrance/mathjax,dpvc/MathJax,jinntrance/mathjax,thomasjm/MathJax,wikimedia/MathJax,thomasjm/MathJax