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On the W3 tutorial, it shows htis code:
<html>
<body>
<script type="text/javascript">
<!--
document.getElementById("demo").innerHTML=Date();
//-->
</script>
</body>
</html>
Then it says:
The two forward slashes at the end of comment line (//) is the JavaScript comment symbol. This prevents JavaScript from executing the --> tag.
This doesn't make sense to me. I thought the whole thing got commented out.
663
In browsers that do understand JavaScript the opening <-- html comment is ignored and the JS code is executed. The JS comment // on the last line then prevents the closing --> being taken as an error by the JS engine. In browsers that don't understand JavaScript everything between <-- and --> is taken as an html comment and ignored.
This whole thing was a precaution for older browsers that didn't know about JS. It is not necessary for any modern browser.
If you want to comment out a block of JS enclose the block in /* and */.
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