The Syntax Checker feature scans through your HTML documents looking for tag or other document errors. This feature can be found on the Edit menu.
The Syntax Checker makes use of the powerful HTML Tidy syntax checking engine, which ensures that your documents are up to W3C standards. The Syntax Checker informs you of tags missing required end tags, extra end tags, and mismatched tags such as this situation:
Once it is finished, it displays a list of all syntax errors in the Results sidebar. You can double-click on a warning or error to go to the problem-causing statement in the document source.