has this code in the question
<map name="A">
<area shape="rect" coords="0,0,100,100" href="XXXXX">
</map>
<img height="100" width="100" src="XXXX" usemap= "#A" >
which shows this in the lists (active questions and search) like this in Chrome 23.0.1271.101 on OSX Mountain Lion
Here is the inspect element
<div class="excerpt">
… For example <span class="search-highlight">I</span> have an image:
<map name="A">
<area shape="rect" coords="0,0,100,100" href="XXXXX">
</map>
<img height="100" width="100" src="XXXX" usemap="#A"> <span class="search-highlight">How</span> <span class="search-highlight">can</span> <span class="search-highlight">I</span> <span class="search-highlight">detect</span> a <span class="search-highlight">mouseover</span> event on this image?
</div>
Update: I see you have changed the search list. I cannot say I like it. However in the current list you also seem to render html tags like H1: