how to create comments in html5
Insert a single-line, or multi-line comment.
Comments are designated by the tags <! -- and -->
Use the comment function to hide scripts on unsupported browsers
. If you are programming in JavaScript or VBScript,
you can use the comment function to hide the script on browsers
that don't support it. Insert the comment at the start of the
script, and end it with //--> to ensure that the script works
on browsers that do support it.