Hiding JavaScript code from old browsers

Sometimes we need to hide the JavaScript code from the old browsers that do not support it.

To prevent old browsers from displaying your JS code, do the following:

Immediately after the opening <script> tag, put a one-line HTML-style comment without the closing characters, so that the first two lines of your script would look like this:

<script language="JavaScript">
<!--

//-->
</script>

Thus, your HTML file will contain the following fragment:

Old browsers will treat your JavaScript code as one long HTML comment. On the other hand, new JavaScript-aware browsers will normally interpret the code between the tags <script> and </script> (the first and last lines of the code will be treated by the JavaScript interpreter as one-line comments).