Name Notes

A rectification of browser technology names.

	Firefox 17	Chrome 23	IE 9	Opera 12
Layout Engine	Gecko	WebKit	Trident	Presto
JavaScript Engine	SpiderMonkey (in C++) Rhino (in Java, not used within browser) Compiles into byte-code	V8 (in C++) Compiles into assembly	Chakra	Carakan (in C++)

The official name for what is normally called JavaScript is ECMAScript. JavaScript was a trademark from Sun and Netscape. Microsoft called its version JScript. See the Wikipedia article ECMAScript for a history.