browser - Using HTML comment tag  still relevant around JavaScript code?

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browser - Using HTML comment tag  still relevant around JavaScript code?

posted Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

browser - Using HTML comment tag  still relevant around JavaScript code?

Is it still relevant to use HTML comment tag around JavaScript code?

I mean

<html>
    <body>
        <script type="text/javascript">
            //<!--
            document.write("Hello World!");
            //-->
        </script>
    </body>
</html>

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1 Reply

深蓝 · Answer 1 · 2021-10-16T22:11:49+0000

HTML comments, ie. , are no longer needed. They were intended to allow browsers that didn't understand the <script> tag to degrade gracefully. These browsers, eg. Netscape 1.x are no longer found in the wild. So there is really no point in putting HTML comments in your script tags anymore.

If you want your HTML to validate as XHTML or XML, you probably want to use a commented out CDATA tag.


<script type="text/javascript">
//<![CDATA[
document.write("Hello World!");
//]]>
</script>

The reason for this is so your <, >, &, " and ' that are part of your javascript code won't have to be encoded as <, >, &, " and ' respectively.

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browser - Using HTML comment tag  still relevant around JavaScript code?

browser - Using HTML comment tag  still relevant around JavaScript code?

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