It's so hard to search for symbols in Google, so I ask here instead.
<!-- looks like a comment for me, but it doesn't work like html. Or it's a one line comment just like // ?
What is the purpose and benefit of using this? Thanks
sample code :
<script type="text/javascript"> <!-- alert("example"); //--> </script> It's an old method of hiding JavaScript from browsers that would treat the text node of a script element as normal text (and display your code).
Douglas Crockford recommends you don't use it anymore.
Do not use the
<!-- //-->hack with scripts. It was intended to prevent scripts from showing up as text on the first generation browsers Netscape 1 and Mosaic. It has not been necessary for many years.<!-- //-->is supposed to signal an HTML comment. Comments should be ignored, not compiled and executed. Also, HTML comments are not to include--, so a script that decrements has an HTML error.
It is HTML -- it's an HTML comment. Often used in a JavaScript block for CDATA: http://en.wikipedia.org/wiki/CDATA
JavaScript treats <!-- as a single line comment, the same as //. This is so you can wrap your JS code such that it looks like an HTML comment to browsers that don't understand JS:
<script> <!-- alert('test'); // --> </script> 
<script> tag at all. This hasn't been the case in any semi-popular browser for over a decade now. Which means that the statement in the answer is correct, though I'm not sure it's treated as a single-line comment. I believe that the symbol is simply ignored by most Javascript engines if it is at the start of a <script> block.Comments in html
<!-- ... -->Comments in javascript are like c:
// .../* ... */