Choose
"HTML Analysis" from the Tools menu.
You can
also set the tool to check your document before previewing it in your
web browser. Choose "Preferences" from the Edit menu in the
main window.
This will
check for any errors in your HTML code such as the omission of <HTML>,
<HEAD> and <BODY> tags. It will also provide hints that
will enhance your document, and make it more standards friendly.
You will
also be notified if you use any deprecated tags in your document, or
any browser-specific tags such as <MARQUEE> or <BLINK>.