This tools displays the list of validity error messages (if any) found by XXE when opening a document or after the last use of
or → Validity State,
The color of the message reflects the severity of the error. See icons used by Validity State.
Clicking on the number of an error message selects the element where the validity error was found.
If the document is edited after its validity is checked (typically to fix some of the validity errors), clicking on some of the error messages may have no effect because the corresponding erroneous element no longer exists.