Ahhh...good eyes, Xelawho!
Yes, even Chrome reports the missing </div>, but then it silently tries to make a best guess as to where it should be.
I don't think IE is wrong in this. When you omit a </div>, all the browser *CAN* do is guess where it should end, and the browser could well guess wrong.
But this entire page is a horrible mess, HTML-wise.
So many errors, it's scary. But, indeed, way down in the list we see:
Line 639, Column 9: end tag for "DIV" omitted, but its declaration does not permit this
Line 537, Column 5: start tag was here
<div id="mainWindow" dojotype="dijit.layout.BorderContainer" design="sideba…
GibbyAR: You *REALLY* should pay attention to the validator and clean up most of those errors. Some will have to remain, because of DOJO, but at least clean up the egregious ones.