Comparison of layout engines (ECMAScript)

The following tables compare ECMAScript (JavaScript) support for a number of layout engines. Please see the individual products' articles for further information. This article is not all-inclusive or necessarily up-to-date. Unless otherwise specified in footnotes, comparisons are based on The Stable versions without any add-ons, extensions or external programs.

EcmaScript version support

		Trident	Tasman	Gecko	WebKit	KHTML
Name of EcmaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS
EcmaScript Version	EDition 3
	JavaScript 1.5 extensions				(?)	(?)
	JavaScript 1.6 extensions				?	?
	JavaScript 1.7 extensions
	JavaScript 1.8 extensions
	JScript.NET extensions
	ActionScript extensions
	Edition 4 (future)

Standard Library

Global object

		Trident	Tasman	Gecko	WebKit	KHTML	Presto
Name of JavaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS	linear b/futhark
Value properties	NaN		4.0 (?)			?
	Infinity		4.0 (?)			?
	undefined		No (?)			?
Function properties	eval(x)		4.0 (?)			?
	parseInt(string [, radix])		4.0 (?)			?
	parseFloat(string)		4.0 (?)			?
	isNaN(number)		4.0 (?)			?
	isFinite(number)		4.0 (?)			?
URI handling functions	decodeURI(encodedURI)		No (?)			?
	decodeURIComponent(encodedURIComponent)		No (?)			?
	encodeURI(uri)		No (?)			?
	encodeURIComponent(uriComponent)		No (?)			?
Constructor properties	Object		?			?
	Function		?			?
	Array		?			?
	String		?			?
	Boolean		?			?
	Number		?			?
	Date		?			?
	RegExp		?			?
	Error		?			?
	EvalError		?			?
	RangeError		?			?
	ReferenceError		?			?
	SyntaxError		?			?
	TypeError		?			?
	URIError		?			?
Other properties	Math		?			?
Additional properties	escape(string)		?			?
Additional properties	unescape(string)		?			?

Object object

		Trident	Tasman	Gecko	WebKit	KHTML	Presto
Name of JavaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS	linear b/futhark
Called as function	Object([value])		?			?
Called as constructor	new Object([value])		?			?
Properties
Properties	prototype		?			?
Properties of prototype	constructor		?			?
	toString()		?			?
	toLocaleString()		?			?
	valueOf()		?			?
	hasOwnProperty(V)		?			?
	isPrototypeOf(V)		?			?
	propertyIsEnumerable(V)		?			?

Function object

		Trident	Tasman	Gecko	WebKit	KHTML	Presto
Name of JavaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS	linear b/futhark
Called as function	Function(p1 [, p2 [, ...,] body])	?	?	?	?	?	?
Called as constructor	new Function(p1 [, p2 [, ...,] body])		?			?
Properties	length	?	?	?	?	?
Properties	prototype		?			?
Properties of prototype	length	?	?	?	?	?	?
	constructor		?			?
	toString()		?			?
	apply(thisArg, argArray)		?			?
	call(thisArg [, arg1 [, arg2 [, ...]]])		?			?
Properties of instances	length		?			?
Properties of instances	prototype		?			?

Array object

		Trident	Tasman	Gecko	WebKit	KHTML	Presto
Name of JavaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS	linear b/futhark
Called as function	Array([item1 [, item2 [, ...]]])	?	?	?	?	?	?
Called as constructor	new Array([item1, item2 [, ...]])		?			?
Called as constructor	new Array(len)		?			?
Properties
Properties	prototype		?			?
Properties of prototype
	constructor		?			?
	toString()		?			?
	toLocaleString()		?			?
	concat([item1 [, item2 [,...]]])		?			?
	join(separator)		?			?
	pop()		?			?
	push([item1 [, item2 [,...]]])		?			?
	reverse()		?			?
	shift()		?			?
	slice(start, end)		?			?
	sort(comparefn)		?			?
	splice(start, deleteCount [, item1 [, item2 [, ...]]])		?			?
	unshift([item1 [, item2 [, ...]]])		?			?
Properties of instances	length		?			?

String object

		Trident	Tasman	Gecko	WebKit	KHTML	Presto
Name of JavaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS	linear b/futhark
Called as function	String([value])	?	?	?	?	?	?
Called as constructor	new String([value])		?			?
Properties
	prototype		?			?
	fromCharCode([char0 [, char1 [, ...]]])		?			?
Properties of prototype
	constructor		?			?
	toString()		?			?
	valueOf()		?			?
	charAt(pos)		?			?
	charCodeAt(pos)		?			?
	concat([string1 [, string2 [, ...]]])		?			?
	indexOf(searchString, position)		?			?
	lastIndexOf(searchString, position)		?			?
	localeCompare(that)		?			?
	match(regexp)		?			?
	replace(searchValue, replaceValue)		?			?
	search(regexp)		?			?
	slice(start, end)		?			?
	split(separator, limit)		?			?
	substring(start, end)		?			?
	toLowerCase()		?			?
	toLocaleLowerCase(comparefn)		?			?
	toUpperCase()		?			?
	toLocaleUpperCase()		?			?
Additional properties of prototype	substr(start, length)		?			?
Properties of instances	length		?			?

Boolean object

		Trident	Tasman	Gecko	WebKit	KHTML	Presto
Name of JavaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS	linear b/futhark
Called as function	Boolean([value])	?	?	?	?	?	?
Called as constructor	new Boolean([value])		?			?
Properties
Properties	prototype		?			?
Properties of prototype	constructor		?			?
	toString()		?			?
	valueOf()		?			?

Number object

		Trident	Tasman	Gecko	WebKit	KHTML	Presto
Name of JavaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS	linear b/futhark
Called as function	Number([value])	?	?	?	?	?	?
Called as constructor	new Number([value])		?			?
Properties
	prototype		?			?
	MAX_VALUE		?			?
	MIN_VALUE		?			?
	NaN		?			?
	NEGATIVE_INFINITY		?			?
	POSITIVE_INFINITY		?			?
Properties of prototype	constructor		?			?
	toString([radix])		?			?
	toLocaleString()		?			?
	valueOf()		?			?
	toFixed(fractionDigits)		?			?
	toExponential(fractionDigits)		?			?
	toPrecision(precision)		?			?

Math object

		Trident	Tasman	Gecko	WebKit	KHTML	Presto
Name of JavaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS	linear b/futhark
Value properties	E		?			?
	LN10		?			?
	LN2		?			?
	LOG2E		?			?
	LOG10E		?			?
	PI	?	?		?	?
	SQRT1_2		?			?
	SQRT2	?	?		?	?
Function properties	abs(x)		?			?
	acos(x)		?			?
	asin(x)		?			?
	atan(x)		?			?
	atan2(y, x)		?			?
	ceil(x)		?			?
	cos(x)		?			?
	exp(x)		?			?
	floor(x)		?			?
	log(x)		?			?
	max([value1 [, value2 [, ...]]])		?			?
	min([value1 [, value2 [, ...]]])		?			?
	pow(X, Y)		?			?
	random(x)		?			?
	round(x)		?			?
	sin(x)		?			?
	sqrt(x)		?			?
	tan(x)		?			?

Date object

		Trident	Tasman	Gecko	WebKit	KHTML	Presto
Name of JavaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS	linear b/futhark
Called as function	Date ([year [, month [, date [, hours [, minutes [, seconds [, ms ]]]]]]])	?	?	?	?	?	?
Called as constructor	new Date (year, month [, date [, hours [, minutes [, seconds [, ms ]]]]])		?			?
	new Date (value)		?			?
	new Date ()		?			?
Properties
	prototype		?			?
	parse(string)		?			?
	UTC (year, month [, date [, hours [, minutes [, seconds [, ms ]]]]])		?			?
Properties of prototype	constructor		?			?
	toString()		?			?
	toDateString()		?			?
	toTimeString()		?			?
	toLocaleString()		?			?
	toLocaleDateString()		?			?
	toLocaleTimeString()		?			?
	valueOf()		?			?
	getTime()		?			?
	getFullYear()		?			?
	getMonth()		?			?
	getUTCMonth()		?			?
	getDate()		?			?
	getUTCDate()		?			?
	getDay()		?			?
	getUTCDay()		?			?
	getHours()		?			?
	getUTCHours()		?			?
	getMinutes()		?			?
	getUTCMinutes()		?			?
	getSeconds()		?			?
	getUTCSeconds()		?			?
	getMilliseconds()		?			?
	getUTCMilliseconds()		?			?
	getTimezoneOffset()		?			?
	setTime(time)		?			?
	setMilliseconds(ms)		?			?
	setUTCMilliseconds(ms)		?			?
	setSeconds(sec [, ms])		?			?
	setUTCSeconds(sec [, ms])		?			?
	setMinutes(min [, sec [, ms]])		?			?
	setUTCMinutes(min [, sec [, ms]])		?			?
	setHours(hour [, min [, sec [, ms]]])		?			?
	setUTCHours(hour [, min [, sec [, ms]]])		?			?
	setDate(date)		?			?
	setUTCDate(date)		?			?
	setMonth(month [, date])		?			?
	setUTCMonth(month [, date])		?			?
	setFullYear(year [, month [, date]])		?			?
	setUTCFullYear(year [, month [, date]])		?			?
	toUTCString()		?			?
Additional properties of prototype	getYear()		?			?
	setYear(year)		?			?
	toGMTString()		?			?

RegExp object

		Trident	Tasman	Gecko	WebKit	KHTML	Presto
Name of JavaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS	linear b/futhark
Called as function	RegExp (pattern, flags)	?	?	?	?	?	?
Called as constructor	new RegExp (pattern, flags)		?			?
Properties
Properties	prototype		?			?
Properties of prototype	constructor		?			?
	exec(string)		?			?
	test(string)		?			?
	toString()		?			?
Properties of instances	source		?			?
	global		?			?
	ignoreCase		?			?
	multiline		?			?
	lastIndex		?			?

Error object

		Trident	Tasman	Gecko	WebKit	KHTML	Presto
Name of JavaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS	linear b/futhark
Called as function	Error (message)	?	?	?	?	?	?
Called as constructor	new Error (message)		?			?
Properties
Properties	prototype		?			?
Properties of prototype	constructor		?			?
	name		?			?
	message		?			?
	toString()		?			?

NativeError objects

		Trident	Tasman	Gecko	WebKit	KHTML	Presto
Name of JavaScript Engine		JScript	JScript	SpiderMonkey	JavaScriptCore	KJS	linear b/futhark
Called as function	EvalError (message)	?	?	?	?	?	?
	RangeError (message)	?	?	?	?	?	?
	ReferenceError (message)	?	?	?	?	?	?
	SyntaxError (message)	?	?	?	?	?	?
	TypeError (message)	?	?	?	?	?	?
	URIError (message)	?	?	?	?	?	?
Called as constructor	new EvalError (message)	?	?	?	?	?	?
	new RangeError (message)	?	?	?	?	?	?
	new ReferenceError (message)	?	?	?	?	?	?
	new SyntaxError (message)	?	?	?	?	?	?
	new TypeError (message)	?	?	?	?	?	?
	new URIError (message)	?	?	?	?	?	?
Properties
Properties	prototype	?	?	?	?	?	?
Properties of prototype	constructor	?	?	?	?	?	?
	name	?	?	?	?	?	?
	message	?	?	?	?	?	?

References

External links

Webdevout — mostly covers Windows browsers. Extensive bug testing.