Support for Netscape's proprietary <wbr> tag was removed in IE 8 (2009-03-19) shortly before it was added to HTML5 (2010-04-02, http://html5.org/r/4956). The following makes it work in IE >= 8:
wbr {
display: inline-block;
}
This can be put into skins/common/shared.css near the rule of the <mark> element.
Version: unspecified
Severity: normal