how to create comments in html5

1<!-- This is the first comment, it won't be shown on a page -->
2
3<h1>And this is a header. It will be fully visible.</h1>
4
5<!--
6Multiline comment.
7You can place a lot of information there.
8Maybe even a whole book.
9-->

1<!-- Comment HTML -->
2<style>
3  /* A CSS comment */
4</style>
5<script>
6  // A Javascript Comment
7</script>

1Insert a single-line, or multi-line comment. 
2Comments are designated by the tags <! -- and -->
3
4Use the comment function to hide scripts on unsupported browsers
5. If you are programming in JavaScript or VBScript, 
6you can use the comment function to hide the script on browsers 
7that don't support it. Insert the comment at the start of the 
8script, and end it with //--> to ensure that the script works 
9on browsers that do support it.