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Sorry about this - I thought we had this one licked, but I'm now seeing incorrect layout of zoomed pages in IE7 using jsMath3.6a with no patches. The problem is apparent on Page > Zoom when viewing http://nrich.maths.org/public/viewer.php?obj_id=6331.
Davide P. Cervone
No, we didn't have it licked, we just had some workarounds that helped. We had it working for displayed math, but in-line math can still go wrong, as exhibited in your example.
My email record indicates that you had been using letter-spacing:0.04em on the enclosing paragraphs and that that helped the issue. I also see a suggestion of adding zoom:100% to the .typeset style.
The zoom feature in IE7 is so badly broken that I don't see any way to work around it in jsMath. So many things go wrong that it does not seem a reasonable feature for people to use, and I'm not planing to try to support it.
Davide, yes sorry, I'm going senile, I had forgotten the details of the previous fix and had omitted our end of things when doing the jsMath upgrade.