Comparison of layout engines (ECMAScript)

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The following tables compare ECMAScript (particularly 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.

Contents

[edit] Explanation of the tables

[edit] Engine nomenclature

Rather than the names of web browsers, the names of the underlying engines are used. The browsers that use the various engines are listed below.

Layout engine Release version Preview version Used by
Amaya 11.3.1 11.3-pre Amaya
Gecko 9.01 10.0b5 All Mozilla software, including Firefox; SeaMonkey and Galeon; Camino; K-Meleon; Flock (up to 2.x); Epiphany-gecko; Debian IceWeasel; GNU IceCat (formerly GNU IceWeasel); Icedove, Iceape and Iceowl; Fennec. Also used by the Maple platform in 2010 and 2011 Samsung "SmartTV" devices which are based on the build used in Firefox 3.0.
KHTML N/A Konqueror
Presto 2.10.229 2.10.238 Opera; Opera Mobile, Nintendo DS & DSi Browser‎; Internet Channel
Prince 7.1 N/A Prince XML
Tasman (IE 5.2.3 for Mac) none (aborted in 2003) Internet Explorer 5+ for Mac OS X
Trident 5.0 (IE 9) 6.0 (IE 10) Internet Explorer and other Internet Explorer shells like Maxthon (Microsoft Windows operating systems only), Windows Phone 7
WebKit 534.20 r83424 Safari (both desktop and mobile), Google Chrome, Maxthon 3, Shiira, iCab 4, OmniWeb 5.5+, Epiphany, Adobe AIR, Midori, Adobe Dreamweaver CS4 and CS5, Android browser, Palm webOS browser, Symbian S60 browser, OWB, Steam, Rekonq, Arora, Flock (version 3+), RockMelt. Used by the LG Smart TV platform to enable web content on TVs.

[edit] Values

Values indicate the level of support in the most recent version of the layout engine, or (if a version number is given) in the specified version. Version numbers without any other value indicate the version at which the layout engine first fully supported the feature.

Value Meaning
Yes Indicates that the layout engine fully supports this property/element when valid values are used.
No Indicates that the property/element is completely ignored.
Partial Indicates that the property/element is understood, but that not all values are supported. Supported values are implemented correctly.
Incorrect Indicates that the property/element is understood, but that it is not implemented correctly in all cases.
Experimental Indicates that the property/element is understood, but supported under an alternate name. May be incomplete or buggy.
Dropped Indicates that the property/element is no longer supported.
Nightly build Indicates that the property/element is supported to some extent in an experimental/nightly build. Future support is expected.
Depends Indicates that the property/element is supported only on certain platforms, or if certain settings are configured.

[edit] ECMAScript version support

Trident Gecko WebKit Presto
Name of ECMAScript Engine JScript/Chakra Spidermonkey/TraceMonkey JavaScriptCore/SquirrelFish Extreme Linear B/Futhark/Carakan
ECMAScript Edition 3 Yes 0.6 Yes 1.0
ECMAScript Edition 5 5.0 2.0 No Yes
JavaScript 1.5 extensions No 0.6 Yes 1.0
JavaScript 1.6 extensions
(excluding E4X)		 No 1.8 Partial Partial
JavaScript 1.7 extensions No 1.8.1 No Partial
JavaScript 1.8 extensions No 1.9 Partial No
JavaScript 1.8.1 extensions No 1.9.1 No No
JScript .NET extensions No No No No
ActionScript extensions No No No No
E4X No 1.8 No No

[edit] Standard Library

[edit] Global object

Trident Gecko WebKit Presto
Value properties
NaN 4.0 0.6 Yes Yes
Infinity 4.0 0.6 Yes Yes
undefined 5.5 0.6 Yes Yes
Function properties
eval(x) 3.0 0.6 Yes Yes
parseInt(string [, radix]) 3.0 0.6 Yes Yes
parseFloat(string) 3.0 0.6 Yes Yes
isNaN(number) 4.0 0.6 Yes Yes
isFinite(number) 4.0 0.6 Yes Yes
URI handling functions
decodeURI(encodedURI) 5.5 0.6 Yes Yes
decodeURIComponent(encodedURIComponent) 5.5 0.6 Yes Yes
encodeURI(uri) 5.5 0.6 Yes Yes
encodeURIComponent(uriComponent) 5.5 0.6 Yes Yes
Constructor properties
Object 4.0 Yes Yes Yes
Function 4.0 Yes Yes Yes
Array 4.0 Yes Yes Yes
String 3.0 Yes Yes Yes
Boolean 3.0 Yes Yes Yes
Number 3.0 Yes Yes Yes
Date 3.0 Yes Yes Yes
RegExp 4.0 Yes Yes Yes
Error 5.0 Yes Yes Yes
EvalError 5.0 Yes Yes No
RangeError 5.0 Yes Yes No
ReferenceError 5.0 Yes Yes No
SyntaxError 5.0 Yes Yes No
TypeError 5.0 Yes Yes No
URIError 5.0 Yes Yes No
Other properties
Math 3.0 Yes Yes Yes
Additional properties
escape(string) 3.0 Yes Yes Yes
unescape(string) 3.0 Yes Yes Yes

[edit] Object object

Trident Gecko WebKit Presto
Called as function
Object([value]) Yes Yes Yes Yes
Called as constructor
new Object([value]) 4.0 Yes Yes Yes
Properties
prototype 4.0 Yes Yes Yes
Properties of prototype
constructor 4.0 Yes Yes Yes
toString() 4.0 Yes Yes Yes
toLocaleString() 4.0 Yes Yes Yes
valueOf() 4.0 Yes Yes Yes
hasOwnProperty(V) 5.5 Yes 3 Yes
isPrototypeOf(V) 5.5 Yes 3 Yes
propertyIsEnumerable(V) 5.5 Yes 3 Yes

[edit] Function object

Trident Gecko WebKit Presto
Called as function
Function([[p1 [, p2 [, ...]],] body])  ?  ?  ?  ?
Called as constructor
new Function([[p1 [, p2 [, ...]],] body]) 4.0 1.0 Yes 1.0
Properties
length  ? 1.0  ? Yes
prototype 4.0 1.0 Yes 1.0
Properties of prototype
length  ? 1.0  ?  ?
constructor 4.0 1.0 Yes 1.0
toString() 4.0 1.0 Yes 1.0
apply(thisArg, argArray) 4.0 1.0 Yes 1.0
call(thisArg [, arg1 [, arg2 [, ...]]]) 4.0 1.0 Yes 1.0
Properties of instances
length 4.0 1.0 Yes 1.0
prototype 4.0 1.0 Yes 1.0

[edit] Array object

Trident Gecko WebKit Presto
Called as function
Array([item1 [, item2 [, ...]]])  ?  ?  ?  ?
Called as constructor
new Array([item1, item2 [, ...]]) 4.0 1.0 Yes 1.0
new Array(len) 4.0 1.0 Yes 1.0
Properties
prototype 4.0 1.0 Yes 1.0
Properties of prototype
constructor 4.0 1.0 Yes 1.0
toString() 4.0 1.0 Yes 1.0
toLocaleString() 5.5 1.0 Yes 1.0
concat([item1 [, item2 [,...]]]) 4.0 1.0 Yes 1.0
join(separator) 4.0 1.0 Yes 1.0
pop() 5.5 1.0 Yes 1.0
push([item1 [, item2 [,...]]]) 5.5 1.0 Yes 1.0
reverse() 4.0 1.0 Yes 1.0
shift() 5.5 1.0 Yes 1.0
slice(start, end) 4.0 1.0 Yes 1.0
sort(comparefn) 4.0 1.0 Yes 1.0
splice(start, deleteCount [, item1 [, item2 [, ...]]]) 5.5 1.0 Yes 1.0
unshift([item1 [, item2 [, ...]]]) 5.5 1.0 Yes 1.0
indexOf(searchElement[, fromIndex]) 9.0[1] 1.8 522 2.1
lastIndexOf(searchElement[, fromIndex]) 1.8 522 2.1
filter(callback[, thisObject]) 1.8 522 2.1
forEach(callback[, thisObject]) 1.8 522 2.1
every(callback[, thisObject]) 1.8 522 2.1
map(callback[, thisObject]) 1.8 522 2.1
some(callback[, thisObject]) 1.8 522 2.1
reduce(callback[, initialValue]) 1.9 528 2.5.22
reduceRight(callback[, initialValue]) 1.9 528 2.5.22
Properties of instances
length 4.0 1.0 Yes 1.0

[edit] String object

Trident Gecko WebKit Presto
Called as function
String([value])  ?  ?  ?  ?
Called as constructor
new String([value]) 3.0 1.0 Yes 1.0
Properties
prototype 4.0 1.0 Yes 1.0
fromCharCode([char0 [, char1 [, ...]]]) 4.0 1.0 Yes 1.0
Properties of prototype
constructor 4.0 1.0 Yes 1.0
toString() 3.0 1.0 Yes 1.0
valueOf() 3.0 1.0 Yes 1.0
charAt(pos) 3.0 1.0 Yes 1.0
charCodeAt(pos) 5.5 1.0 Yes 1.0
concat([string1 [, string2 [, ...]]]) 4.0 1.0 Yes 1.0
indexOf(searchString, position) 3.0 1.0 Yes 1.0
lastIndexOf(searchString, position) 3.0 1.0 Yes 1.0
localeCompare(that) 5.5 1.0 Yes 1.0
match(regexp) 4.0 1.0 Yes 1.0
replace(searchValue, replaceValue) 3.0 1.0 Yes 1.0
search(regexp) 4.0 1.0 Yes 1.0
slice(start, end) 4.0 1.0 Yes 1.0
split(separator, limit) 4.0 1.0 Yes 1.0
substring(start, end) 3.0 1.0 Yes 1.0
toLowerCase() 3.0 1.0 Yes 1.0
toLocaleLowerCase(comparefn) 3.0 1.0 No 1.0
toUpperCase() 3.0 1.0 Yes 1.0
toLocaleUpperCase() 3.0 1.0 No 1.0
Additional properties of prototype
substr(start, length) 4.0 1.0 Yes 1.0
Properties of instances
length 3.0 1.0 Yes 1.0

[edit] Boolean object

Trident Gecko WebKit Presto
Called as function
Boolean([value])  ?  ? Yes  ?
Called as constructor
new Boolean([value]) 3.0 Yes Yes Yes
Properties
prototype 4.0 Yes Yes Yes
Properties of prototype
constructor 4.0 Yes Yes Yes
toString() 4.0 Yes Yes Yes
valueOf() 4.0 Yes Yes Yes

[edit] Number object

Trident Gecko WebKit Presto
Called as function
Number([value])  ?  ? Yes  ?
Called as constructor
new Number([value]) 3.0 1.0 Yes 1.0
Properties
prototype 4.0 1.0 Yes 1.0
MAX_VALUE 4.0 1.0 Yes 1.0
MIN_VALUE 4.0 1.0 Yes 1.0
NaN 4.0 1.0 Yes 1.0
NEGATIVE_INFINITY 4.0 1.0 Yes 1.0
POSITIVE_INFINITY 4.0 1.0 Yes 1.0
Properties of prototype
constructor 4.0 1.0 Yes 1.0
toString([radix]) 4.0 1.0 Yes 1.0
toLocaleString() 5.5 1.0 Yes 1.0
valueOf() 4.0 1.0 Yes 1.0
toFixed(fractionDigits) 5.5 1.0 Yes 1.0
toExponential(fractionDigits) 5.5 1.0 Yes 1.0
toPrecision(precision) 5.5 1.0 Yes 1.0

[edit] Math object

Trident Gecko WebKit Presto
Value properties
E 3.0 1.0 Yes 1.0
LN10 3.0 1.0 Yes 1.0
LN2 3.0 1.0 Yes 1.0
LOG2E 3.0 1.0 Yes 1.0
LOG10E 3.0 1.0 Yes 1.0
PI Yes Yes Yes Yes
SQRT1_2 3.0 1.0 Yes 1.0
SQRT2 Yes Yes Yes Yes
Function properties
abs(x) 3.0 1.0 Yes 1.0
acos(x) 3.0 1.0 Yes 1.0
asin(x) 3.0 1.0 Yes 1.0
atan(x) 3.0 1.0 Yes 1.0
atan2(y, x) 3.0 1.0 Yes 1.0
ceil(x) 3.0 1.0 Yes 1.0
cos(x) 3.0 1.0 Yes 1.0
exp(x) 3.0 1.0 Yes 1.0
floor(x) 3.0 1.0 Yes 1.0
log(x) 3.0 1.0 Yes 1.0
max([value1 [, value2 [, ...]]]) 3.0 1.0 Yes 1.0
min([value1 [, value2 [, ...]]]) 3.0 1.0 Yes 1.0
pow(x, y) 3.0 1.0 Yes 1.0
random() 3.0 1.0 Yes 1.0
round(x) 3.0 1.0 Yes 1.0
sin(x) 3.0 1.0 Yes 1.0
sqrt(x) 3.0 1.0 Yes 1.0
tan(x) 3.0 1.0 Yes 1.0

[edit] Date object

Trident Gecko WebKit Presto
Called as function
Date ([year [, month [, date [, hours [, minutes [, seconds [, ms ]]]]]]])  ?  ?  ?  ?
Called as constructor
new Date (year, month [, date [, hours [, minutes [, seconds [, ms ]]]]]) 4.0 1.0 Yes 1.0
new Date (value) 4.0 1.0 Yes 1.0
new Date () 4.0 1.0 Yes 1.0
Properties
prototype 4.0 1.0 Yes 1.0
parse(string) 3.0 1.0 Yes 1.0
UTC (year, month [, date [, hours [, minutes [, seconds [, ms ]]]]]) 3.0 1.0 Yes 1.0
Properties of prototype
constructor 4.0 1.0 Yes 1.0
toString() 4.0 1.0 Yes 1.0
toDateString() 4.0 1.0 Yes 1.0
toTimeString() 4.0 1.0 Yes 1.0
toLocaleString() 4.0 1.0 Yes 1.0
toLocaleDateString() 4.0 1.0 Yes 1.0
toLocaleTimeString() 4.0 1.0 Yes 1.0
valueOf() 4.0 1.0 Yes 1.0
getTime() 3.0 1.0 Yes 1.0
getFullYear() 4.0 1.0 Yes 1.0
getMonth() 3.0 1.0 Yes 1.0
getUTCMonth() 4.0 1.0 Yes 1.0
getDate() 3.0 1.0 Yes 1.0
getUTCDate() 4.0 1.0 Yes 1.0
getDay() 3.0 1.0 Yes 1.0
getUTCDay() 4.0 1.0 Yes 1.0
getHours() 3.0 1.0 Yes 1.0
getUTCHours() 4.0 1.0 Yes 1.0
getMinutes() 3.0 1.0 Yes 1.0
getUTCMinutes() 4.0 1.0 Yes 1.0
getSeconds() 3.0 1.0 Yes 1.0
getUTCSeconds() 4.0 1.0 Yes 1.0
getMilliseconds() 4.0 1.0 Yes 1.0
getUTCMilliseconds() 4.0 1.0 Yes 1.0
getTimezoneOffset() 4.0 1.0 Yes 1.0
setTime(time) 3.0 1.0 Yes 1.0
setMilliseconds(ms) 4.0 1.0 Yes 1.0
setUTCMilliseconds(ms) 4.0 1.0 Yes 1.0
setSeconds(sec [, ms]) 3.0 1.0 Yes 1.0
setUTCSeconds(sec [, ms]) 4.0 1.0 Yes 1.0
setMinutes(min [, sec [, ms]]) 3.0 1.0 Yes 1.0
setUTCMinutes(min [, sec [, ms]]) 4.0 1.0 Yes 1.0
setHours(hour [, min [, sec [, ms]]]) 4.0 1.0 Yes 1.0
setUTCHours(hour [, min [, sec [, ms]]]) 4.0 1.0 Yes 1.0
setDate(date) 4.0 1.0 Yes 1.0
setUTCDate(date) 4.0 1.0 Yes 1.0
setMonth(month [, date]) 3.0 1.0 Yes 1.0
setUTCMonth(month [, date]) 4.0 1.0 Yes 1.0
setFullYear(year [, month [, date]]) 4.0 1.0 Yes 1.0
setUTCFullYear(year [, month [, date]]) 4.0 1.0 Yes 1.0
toUTCString() 4.0 1.0 Yes 1.0
Additional properties of prototype
getYear() 3.0 1.0 Yes 1.0
setYear(year) 3.0 1.0 Yes 1.0
toGMTString() 4.0 1.0 Yes 1.0

[edit] RegExp object

Trident Gecko WebKit Presto
Called as function
RegExp (pattern, flags)  ?  ?  ?  ?
Called as constructor
new RegExp (pattern, flags) 4.0 1.0 Yes 1.0
Properties
prototype 4.0 1.0 Yes 1.0
Properties of prototype
constructor 4.0 1.0 Yes 1.0
exec(string) 4.0 1.0 Yes 1.0
test(string) 4.0 1.0 Yes 1.0
toString() 4.0 1.0 Yes 1.0
Properties of instances
source 4.0 1.0 Yes 1.0
global 4.0 1.0 Yes 1.0
ignoreCase 5.5 1.0 Yes 1.0
multiline 5.5 1.0 Yes 1.0
lastIndex 4.0 1.0 Yes 1.0

[edit] Error object

Trident Gecko WebKit Presto
Called as function
Error (message)  ?  ?  ?  ?
Called as constructor
new Error (message) 5.0 1.0 Yes 1.0
Properties
prototype 5.0 1.0 Yes 1.0
Properties of prototype
constructor 5.0 1.0 Yes 1.0
name 5.5 1.0 Yes 1.0
message 5.5 1.0 Yes 1.0
toString() 5.0 1.0 Yes 1.0

[edit] NativeError objects

Trident Gecko WebKit Presto
Called as function
EvalError (message)  ? 1.0 Yes  ?
RangeError (message)  ? 1.0 Yes  ?
ReferenceError (message)  ? 1.0 Yes  ?
SyntaxError (message)  ? 1.0 Yes  ?
TypeError (message)  ? 1.0 Yes  ?
URIError (message)  ? 1.0 Yes  ?
Called as constructor
new EvalError (message)  ? 1.0 Yes  ?
new RangeError (message)  ? 1.0 Yes  ?
new ReferenceError (message)  ? 1.0 Yes  ?
new SyntaxError (message)  ? 1.0 Yes  ?
new TypeError (message)  ? 1.0 Yes  ?
new URIError (message)  ? 1.0 Yes  ?
Properties
prototype  ? 1.0  ?  ?
Properties of prototype
constructor  ? 1.0  ?  ?
name  ? 1.0 Yes  ?
message  ? 1.0 Yes  ?

[edit] References

  1. ^ ECMAScript 5 Arrays, Microsoft, http://ie.microsoft.com/testdrive/HTML5/ECMAScript5Array/ 

[edit] External links

  • Webdevout — mostly covers Windows browsers. Extensive bug testing.
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