Any reason why? I know it's not actually used in HTML but it would make it easier to change to XHTML if you ever needed to. I ask because I'm working on merging the HTML XHTML bundles into one and simplifying it a lot in the process.
Because <img /> won't validate as strict html 4.01 :) So, why HTML then, and not XHTML? Well I wass all for cutting edge XHTML yada yada, then I read in this book that there really is no difference AND XHTML makes some JavaScript stuff more complex if you really want to play by the rules. I still have some problems not going XHTML, but then again, why? for example, you're not allowed document.createElement('img'), but rather it should be document.createElementNS(... DTD path to xhtml, 'img) instead. The author spends little over two pages arguing that HTML is better than XHTML (for now). Books is DHTML utopia, from sitepoint, by Stuart Langridge.
I must confess I don't really know either way, but he makes a good argument :) So if you have any further points I'd like to hear about them, although it might blote the list a bit.
Andreas