It looks good, but I do hope they get the attributes added, as that's probably the most important bit. They do need to be careful though with their examples, as they have a duty to make sure they are right....
I've just redesigned a site for a client as it's 4 years old and looked it. Today I finished it off by including the nice Valid HTML and CSS icons (suitably discrete, so the client can confirm this) and linked them to the relevant W3C validators. To make it easier to use I added target="_blank" to the anchor to make the results appear in a new tab (Firefox - and yes, I know I can do all this in the Web Developer toolbar). Of course it now fails to validate because target="_blank" is deprecated (except for frames). Doh! <fx>slaps wrist</fx>
The htmlPlayground anchor tag (which was the first one I thought I'd try after I read your post) includes by default an example link to Google which uses target="_blank". I hope their other examples are more valid!
