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I didn't realize this before, but JSLint will do validation on HTML files. It also handles the contents of your <script> tags using its regular JS validation. Should turn this on. It's not the ultimate answer for HTML validation, but it's still useful.
http://git.eclipse.org/c/orion/org.eclipse.orion.client.git/commit/?id=68a1957805d4c6909fd6bf93a5380f11bf26770b As usual, it's pretty stringent. If anyone finds some of the errors to be annoying or bogus, I can filter them out.