Are there any standalone HTML markup validation tools [closed]
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . Other than submit individual web pages for verification on the W3C site, are there any standalone tools that will do this job. Ideally this would be a visual studio plugin that could catch errors at design time but one that would just take a wep application url running locally would be good. Open source