Details
Description
IE is very sensitive to the way the BASE tag is written. This can affect correct rendering of CSS rules + javascript execution.
See http://tacoscomponents.jot.com/BugReporter/Bug86 , http://drupal.org/node/44934 , http://mg.to/2006/04/29/your-body-is-in-your-head for more.
In a word, IE expects the BASE tag to be rendered as <base href='...'></base> .
We currently render it as <base href='...'/>
The cross-browser, XHTML + HTML4 compliant solution would render:
<base href='...'/><!-[if IE]></base><![endif]->