HTML comments are not displayed in the browser, can see only web master working to coding.
With comments you can place notifications and reminders in your HTML.
Syntax:
<!--- some comment go here --->
HTML comments can also be added in the middle of a sentence. E.g:
My manager, Martin, looked like <!--- add a description later --->and didn't like being late.
In some situations, it is necessary to have multi-line comments, which can also be enabled.
<!---------------------------
first comment
second comment
third comment
---------------------------->
Using the HTML comment tag, it is possible to exclude some HTML elements and sections from the page without deleting them.
<!---------------------------
<img src="aeroplan.jpg">
<p> text about this aeroplan </p>
---------------------------->