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2. Client-side JavaScript > 2.1. JavaScript in HTML

JavaScript in HTML

JavaScript code may be embedded in HTML files in the form of scripts, event handlers and URLs, as detailed below.

The <script> tag

Most JavaScript code appears in HTML files between a <script> tag and a </script> tag. For example:

<script>
document.write("The time is: " + new Date());
</script>

In JavaScript 1.1 and later you can use the src attribute of the <script> tag to specify the URL of an external script to be loaded and executed. Files of JavaScript code typically have a .js extension. Note that the </script> tag is still required when this attribute is used:

<script src="library.js"></script>

HTML allows scripts to be written in languages other than JavaScript, and some browsers, such as Internet Explorer, support languages such as VBScript. You can use the language attribute to specify what language a script is written in. This attribute defaults to "JavaScript" in all browsers, so you do not usually have to set it. You can also use attribute values such as “JavaScript1.3” and “JavaScript1.5” to specify the version of JavaScript your code uses. Browsers that do not support the specified version of the language simply ignore the script.


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