Support old-style background and color attributes
Support old-style background and color attributes

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