Essentials of Javascript - Cultural View

JavaScript Style Sheets 44
}
fontSize = "16pt";
marginTop = "2cm";
Similar to Cascading Style Sheets JSSS can be used in a -tag. This Example shows two different methods to
select tags.
Browser support
Javascript Style Sheets were only supported by Netscape 4.x (4.0–4.8) but no later versions. No other web browser
integrated JSSS.
External links
• Netscape's JavaScript-Based Style Sheets submission to the W3C [1]
• The dynamic, powerful abilities of JavaScript Style Sheets [3]
References
[1] http://www.w3.org/Submission/1996/1/WD-jsss-960822
[2] Håkon Wium Lie; Bert Bos. "Chapter 20 - The CSS saga" (http://www.w3.org/Style/LieBos2e/history/). World Wide Web Consortium. .
Retrieved 23 June 2010.
[3] http://sunsite.uakom.sk/sunworldonline/swol-04-1997/swol-04-webmaster.html
JavaScript engine
A JavaScript engine is specialized software which interprets and executes JavaScript. Although there are several
[1] [2]
uses for a JavaScript engine, the most common usage is for web browsers.
History
Before the second browser wars in 2008-2009, the JavaScript engine (also known as JavaScript interpreter or
JavaScript implementation) was known simply as an interpreter that reads JavaScript source code and executes the
script accordingly.
The first ever JavaScript engine was created by Brendan Eich at Netscape Communications Corporation, for the
Netscape Navigator web browser. The engine, code named SpiderMonkey, is implemented in C. It has since been
updated (in JavaScript 1.5) to conform to ECMA-262 Edition 3. The Rhino engine, created primarily by Norris Boyd
(also at Netscape) is a JavaScript implementation in Java. Like SpiderMonkey, Rhino is ECMA-262 Edition 3
compliant. Applications of the technology include Apple Safari 4's Nitro, Google Chrome's V8 and Mozilla Firefox
3.5's TraceMonkey.
By far, the most common host environment for JavaScript is a web browser. Web browsers typically use the public
API to create "host objects" responsible for reflecting the DOM into JavaScript.
The web server is another common application of the engine. A JavaScript webserver would expose host objects
representing a HTTP request and response objects, which a JavaScript program could then manipulate to
dynamically generate web pages. Microsoft's ASP technology for IIS allows server-side code to be written in VB
Script or JScript (Microsoft's implementation of JavaScript). Jaxer is a web server that runs entirely on JavaScript.
This has the benefit of allowing the same code to be shared on the server and on the client.