I got the following message from W3c
Line 313, Column 17: unclosed start-tag requires SHORTTAG YES
<div class=”tags”><img src=”http://www………c…
The construct <foo<bar> is valid in HTML (it is an example of the rather obscure “Shorttags” feature) but its use is not recommended. In most cases, this is a typo that you will want to fix. If you really want to use shorttags, be aware that they are not well implemented by browsers.
I have modified the single.php file to display an icon for tags with help (I do not know anything beyond css myself), the code for this line is: