Imagemaps (navigation) broken in IE8 – fix

We rolled out IE8 to a customer earlier this week and promptly found their company website didn’t work in ie8 (despite some users having had IE8 for several months). An imagemap that they use for navigation did not show up in IE8 on internal computers. The weirdest thing is that all the computers at their office had the problem yet none of our computers or some other computers we tried could reproduce the problem.

After trying many technical solutions I passed it to our web developer who very quickly came up with a bug in ie8 and content produced by Publisher

“Publisher HTML output uses some very large numbers for object coordinates. This behavior has worked in the past. However, Internet Explorer 8 does not support such large coordinates. This is because some precision was moved from the most significant end to the least significant end of the coordinate variables to allow for sub-pixel layouts. Therefore, when large coordinate values in Publisher HTML output are run through Microsoft Dynamic HTML, the values are truncated. This behavior causes significant problems when Publisher HTML is rendered in Internet Explorer 8.”

Sure enough – saving the files within Publisher 2007 sp2 fixed the issue.

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