Comment tags are used to insert comments in the HTML source code.
HTML Comment Tags
You can add comments to your HTML source by using the following syntax:<!-- Write your comments here -->
Note: Comments are not displayed by the browser, but they can help document your HTML source code.
With comments you can place notifications and reminders in your HTML:Example
<!-- This is a comment -->
<p>This is a paragraph.</p>
<!-- Remember to add more information here -->
Example
<!-- Do not display this at the moment
<img border="0" src="pic_mountain.jpg" alt="Mountain">
-->
Conditional Comments
You might stumble upon conditional comments in HTML:<!--[if IE 9]>
.... some HTML here ....
<![endif]-->