html how to add comment

1<!-- a comment in html -->

1<!-- this will be ignored -->

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<!--
2this is a multi-line comment and is the only way to comment in html
3However you can put them on the same line
4-->
5