Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
HTML issues tagged as less than.
< character has been found when an attribute was expected instead. Check the syntax of the affected tag, it’s probably malformed and a
< character inside has been interpreted as an attribute.
For example, this code might cause this issue:
<!-- Malformed img tag --> <img src="photo.jpg" alt="smiling cat" < /> <!-- Fixed img tag --> <img src="photo.jpg" alt="smiling cat" />
When was the last time you validated your whole site?
Keep your sites healthy checking for A11Y/HTML issues on an automated schedule.