The comment tag is used to insert a comment in the source
code. A comment will be ignored by the browser. You can use
comments to explain your code, which can help you when you
edit the source code at a later date.
You can also store program-specific information inside
comments. In this case they will not be visible for the
user, but they are still available to the program. A good
practice is to comment the text inside scripts and style
elements to prevent older browsers, that do not support
scripting or styles, from showing it as plain text.
<!--This is a comment, it will not be displayed in the browser--><p>But this will</p>