HTML Checking for Large Sites
Rocket Validator automatically checks your pages on the W3C Validator.
Element X is missing required attribute Y.
The element X requires an attribute Y, but it’s not present. Check that element and add the required attribute, like in <X Y="value" />.
Related W3C validator issues
The src attribute for <img> tags is required, to define the source of the image, like in this example:
<img src="photo.jpg" alt="wombat" />
<img> tags used to display images require the attribute src to indicate the source of the image, for example <img src="/img/photo.jpg" />.
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