HTML Checking for Large Sites
Rocket Validator automatically checks your pages on the W3C Validator.
HTML issues tagged as duplicate attribute.
Attributes in HTML elements must be unique. For example, <a id="one" id="two"> is invalid as the attribute id is repeated.
25,000 HTML checks per month. Is that enough for your site?
Save time using our automated web checker. Let our crawler check your web pages on the W3C Validator.