in early 2011, a X-UA meta tag was added to body.html. see http://bugs.olat.org/jira/browse/OLAT-6061
<!-- temp solution for OLAT-6061 until ExtJS 4 is available -->
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE8" />
Now i removed the tag. As a consequence, OpenOLAT looks nicer in IE9, all the supported CSS3 features are now correctly rendered. ( "MS correctly" ^^ )
- the ExtJS tree (GUI demo), which works nicely. (DD, inline editing)
- the AJAX tree (Course editor), DD works
- Dragging of ExtJS windows
If you know of other possible problems with IE9 document mode, please comment and I will test them as well...