I use the W3C Unicorn Validator for almost all my markup validation needs. However every time I need to validate something I almost always end up googling "W3C Unicorn". Which I admit is still pretty fast, but I wanted to cut as much faff out of that process as possible.
I'm not entirely sure if their are a million of these already online, but a quick Google search didn't bring anything up (and that was a good enough reason for me).
Anyway, drag the following link into your bookmark toolbar to use it* :
- If your not sure how to add a bookmarklet to your toolbar then watch this