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Editorial Team
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Asked: 2026-05-29T08:06:50+00:00

What is the purpose of using // in the following code. If old browsers

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What is the purpose of using // in the following code. If old browsers doesnt support javascript then the symbols <!-- --> will ignore js code. In case browsers support JS, these symbols <!-- --> will be ignored. Then wats the use of // symbols.

<html>
<body>
<script type="text/javascript">
<!--
document.getElementById("demo").innerHTML=Date();
//-->
</script>
</body>
</html>
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1 Answer

  1. Editorial Team

    If old browsers doesnt support javascript then the symbols <!-- --> will ignore js code.

    True, assuming HTML and for a definition of “old browsers” equal to “Netscape 1 era”. Don’t use them today.

    In case browsers support JS, these symbols <!-- --> will be ignored.

    Only half true. Only the start of the comment is special cased. From the specification:

    The JavaScript engine allows the string “<!--” to occur at the start of a SCRIPT element, and ignores further characters until the end of the line. JavaScript interprets “//” as starting a comment extending to the end of the current line. This is needed to hide the string “-->” from the JavaScript parser.

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