YouTube is worlds apart from the likes of MySpace (*shudder*) when it comes to good code, but like most massively influential sites, they don’t really seem to care that much if their code validates, and even less if the code they provide webmasters for embedding content in their own sites does.

Frankly, I usually don’t care that much about validation either. I worked in this field for too many years when no validators even existed, and I’ve always taken the pragmatic approach: make it look and work the same, more or less, in all reasonably recent versions of Internet Explorer and Netscape (with Firefox and Safari having replaced Netscape over the past few years), and be done with it. Read more »