AssistiveMML extension throws error on IE8 [was: HTML-CSS output causes “unknown runtime error” in IE8]

Created by: drify

Just open the test page http://cdn.mathjax.org/mathjax/latest/test/sample-tex.html using IE8. In fact the math renders properly, but the console shows the error. MathJax 2.5 doesn't have this issue. http://cdn.mathjax.org/mathjax/2.5-latest/test/sample-tex.html