JavaScript Tutorial for Programmers - Embedding
Javascript
JavaScript code is typically embedded into an HTML document
using the SCRIPT tag. You are free to embed as many scripts
into a single document as you like, using multiple SCRIPT
tags. A script embedded in HTML with the SCRIPT tag uses
the format:
<script language="JavaScript">
<!--
document.write("Hello World!");
//-->
</script>
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The LANGUAGE attribute is optional, but recommended.
You may specify that a section of code only be executed
by browsers which support a particular version of JavaScript;
for instance:
<script language="JavaScript1.2">
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Another attribute of the SCRIPT tag, SRC, can be used
to include an external file containing JavaScript code
rather than code embedded into the HTML:
<script language="JavaScript" src="corefunctions.js">
</script>
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The external file is simply a text file containing
JavaScript code, and whose filename ends with the extension
".js". Note that although some version 3 browsers
support the SRC attribute, it only functions reliably
across platforms in the version 4 browsers.
Scripts can be placed inside comment fields to ensure
that your JavaScript code is not displayed by old browsers
that do not recognize JavaScript. The markup to begin
a comment field is <!-- while you close a comment
field using //-->. This practice is certainly optional,
but considered good form when your page is likely to
be visited by older browsers. Certainly, as older browsers
fade away, this practice will likely become unnecessary.
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