HTML comment <!--...--> Tag

[Stevyn]

http://www.w3schools.com/tags/tag_comment.asp

Definition and Usage

The comment tag is used to insert comments in the source code. Comments are not displayed in the browsers.

You can use comments to explain your code, which can help you when you edit the source code at a later date. This is especially useful if you have a lot of code.

It is also a good practice to use the comment tag to "hide" scripts from browsers without support for it (so they don't show them as plain text):

Code: Select all

<script type="text/javascript">
<!--
function displayMsg()
{
alert("Hello World!")
}
//-->
</script>  

Note: The two forward slashes at the end of comment line (//) is the JavaScript comment symbol. This prevents JavaScript from executing the --> tag.

[Stevyn]

the above example will hide the code from being used but if people look at the source they will see the hidden comments/code

to make it not viewable at all but in the original code you code do something like this in php

Code: Select all

<?php
/* Example comment here. */
?>

(tip by ktleow, 2009)