HTML Guide
Free site validation
Find out what web pages on your sites are affected by HTML issues.
The aria-labelledby attribute establishes relationships between objects and their label(s), and its value should be one or more element IDs. It should reference an existing ID on the same document, but that id was not found.
Learn more:
Related W3C validator issues
labelledby is not a valid attribute for the <svg> element. Perhaps you meant aria-labelledby?
The aria-labelledby attribute establishes relationships between objects and their label(s), and its value should be one or more element IDs, which refer to elements that have the text needed for labeling.
Example:
<div id="myBillingId">Billing</div>
<div>
<div id="myNameId">Name</div>
<input type="text" aria-labelledby="myBillingId myNameId"/>
</div>
<div>
<div id="myAddressId">Address</div>
<input type="text" aria-labelledby="myBillingId myAddressId"/>
</div>