ARIA attributes point at things that do not exist
aria-valid-attr-value
Some elements reference another element by id, but that element is not on the page.
Who this affects
Screen reader users, who get silence where a label or description should be.
Fix it in WordPress
Often left behind when a block is deleted but another block still references it. Re-save the affected page in the editor.
What the fix is, technically
Correct the referenced id, or remove the attribute.
Does your site have this problem?
Scan any page free and find out in about fifteen seconds. No signup, and nothing about your site is stored.
Check my page