Viewing the MathJax home page (www.mathjax.org) using Internet Explorer 7 at 75% zoom causes the characters to collide. This is not a problem using Internet Explorer 8.
The zoom function in IE7 is badly broken, and it does not possible to make MathJax work with it in a reasonable way. I've tried hard to work around as many IE bugs as I could, but the zoom implementation in IE7 is so poorly behaved that I just couldn't do it. I don't like to say it, but this is one of those cases where "update the browser" is really the only answer.
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