Total Validator Tool
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Full user review
"Excellent, reliable validator that picks up errors other validators miss."
This utility detects and suggests corrections for errors that are missed by the one built into AceHTML Pro and the stand-alone CSE HTML Validator. It works fast and it is updated regularly.
Only one complaint. A recent update introduced a glitch. It is now necessary to identify the file to be validated twice -- a real pain. And the updates since have not put it right.