You can use MT tag within html's comment tag

maRk, an author of the blog "maRk's MyOwn", found that you can use MT tag within html's comment tag.

For example, if you write this code in MT's template,

<!-- <$MTDate language="en"$> -->

the result will be like this.

<!-- January 25, 2010 3:29 PM -->

Accoding to his article, CodeMirror of MT5 doesn't emphasis comment tag.