Client-side JavaScript is the name given to JavaScript code
that is embedded within an HTML file and executed by a web browser. In addition
to the core objects described in the previous section, client-side JavaScript
code has access to a number of other objects that represent the web browser, the
document displayed in the browser, and the contents of that document.
Client-side JavaScript programs are usually event-based, which means that
JavaScript event handlers are executed in
response to user interactions with the browser and the document. The client-side
JavaScript scripting framework is powerful enough to open substantial security
holes in web browsers. For this reason, web browsers typically restrict the
actions of client-side scripts. This section starts by explaining how JavaScript
code is embedded in HTML files, then goes on to introduce the client-side
JavaScript objects, JavaScript events and event handling, and JavaScript
security restrictions.
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