Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
Related W3C validator issues
A <span> tag has not been closed. Example:
<p><span>I'm forgetting something</p> <p>Life goes on</p>
12,500 Accessibility and HTML checks per week. Fully automated.
Let our automated scanner check your large sites using Axe Core and W3C Validator.