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Chapter 4. The JavaScript Runtime Environment > Extended Browser Functionality

Extended Browser Functionality

In addition to the scripting functionality you can add to Web pages, JavaScript can also be used to extend your browser's functionality. Today's most functional browsers support plug-ins and/or ActiveX controls. These plug-ins are loaded by the browser when it starts and are accessed when called via HTML tags on a page. Because plug-in instances run as objects within the browser's environment, some core JavaScript objects can be used to access, modify, and control their functionality.

JavaScript also supports interaction with Java applets embedded in a page. This type of interaction can occur in both directions—from the applet to scripts on a page, and from scripts to the applet. The technology behind this is referred to as LiveConnect and will be discussed in more detail later in the chapter.


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