This command validates the current page using the W3C validation service. So far, this works for pages with a URL that W3C can find on the web. I am working on making this available for local testing as well. Works with Ubiquity 0.5.
Also, check out my other commands.
Note: you can subscribe to this command from this page. If you have Ubiquity installed, a bar should pop down with a “Subscribe” button.