Comparison of layout engines (ECMAScript)

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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.

Contents

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of EcmaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
EcmaScript Version Edition 3 Yes Yes 0.6 Yes Yes Yes Yes (?)
JavaScript 1.5 extensions No No 0.6 Yes (?) Yes (?) Yes (?)  ?
JavaScript 1.6 extensions No No 1.8  ?  ?  ? No
JavaScript 1.7 extensions No No 1.8.1 No No No No
JavaScript 1.8 extensions No No 1.9 No No No No
JScript.NET extensions No No No No No No No
ActionScript extensions No No No No No No No
Edition 4 (future) No No Planned for 2.0 No No No No

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of JavaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
Value properties NaN 4.0 4.0 (?) 0.6 Yes  ? Yes  ?
Infinity 4.0 4.0 (?) 0.6 Yes  ? Yes  ?
undefined 5.5 No (?) 0.6 Yes  ? Yes  ?
Function properties eval(x) 3.0 4.0 (?) 0.6 Yes  ? Yes  ?
parseInt(string [, radix]) 3.0 4.0 (?) 0.6 Yes  ? Yes  ?
parseFloat(string) 3.0 4.0 (?) 0.6 Yes  ? Yes  ?
isNaN(number) 4.0 4.0 (?) 0.6 Yes  ? Yes  ?
isFinite(number) 4.0 4.0 (?) 0.6 Yes  ? Yes  ?
URI handling functions decodeURI(encodedURI) 5.5 No (?) 0.6 Yes  ? Yes  ?
decodeURIComponent(encodedURIComponent) 5.5 No (?) 0.6 Yes  ? Yes  ?
encodeURI(uri) 5.5 No (?) 0.6 Yes  ? Yes  ?
encodeURIComponent(uriComponent) 5.5 No (?) 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 No  ? No  ?
RangeError 5.0  ? Yes No  ? No  ?
ReferenceError 5.0  ? Yes No  ? No  ?
SyntaxError 5.0  ? Yes No  ? No  ?
TypeError 5.0  ? Yes No  ? No  ?
URIError 5.0  ? Yes No  ? 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  ?

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of JavaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
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 No  ? Yes  ?
isPrototypeOf(V) 5.5  ? Yes No  ? Yes  ?
propertyIsEnumerable(V) 5.5  ? Yes No  ? Yes  ?

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of JavaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
Called as function Function([[p1 [, p2 [, ...]],] body])  ?  ?  ?  ?  ?  ?  ?
Called as constructor new Function([[p1 [, p2 [, ...]],] body]) 4.0  ? 1.0 Yes  ? 7.0  ?
Properties length  ?  ?  ?  ?  ? Yes  ?
prototype 4.0  ? 1.0 Yes  ? 7.0  ?
Properties of prototype length  ?  ?  ?  ?  ?  ?  ?
constructor 4.0  ? 1.0 Yes  ? 7.0  ?
toString() 4.0  ? 1.0 Yes  ? 7.0  ?
apply(thisArg, argArray) 4.0  ? 1.0 Yes  ? 7.0  ?
call(thisArg [, arg1 [, arg2 [, ...]]]) 4.0  ? 1.0 Yes  ? 7.0  ?
Properties of instances length 4.0  ? 1.0 Yes  ? 7.0  ?
prototype 4.0  ? 1.0 Yes  ? 7.0  ?

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of JavaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
Called as function Array([item1 [, item2 [, ...]]])  ?  ?  ?  ?  ?  ?  ?
Called as constructor new Array([item1, item2 [, ...]]) 4.0  ? 1.0 Yes  ? 7.0  ?
new Array(len) 4.0  ? 1.0 Yes  ? 7.0  ?
Properties
prototype 4.0  ? 1.0 Yes  ? 7.0  ?
Properties of prototype
constructor 4.0  ? 1.0 Yes  ? 7.0  ?
toString() 4.0  ? 1.0 Yes  ? 7.0  ?
toLocaleString() 5.5  ? 1.0 Yes  ? 7.0  ?
concat([item1 [, item2 [,...]]]) 4.0  ? 1.0 Yes  ? 7.0  ?
join(separator) 4.0  ? 1.0 Yes  ? 7.0  ?
pop() 5.5  ? 1.0 Yes  ? 7.0  ?
push([item1 [, item2 [,...]]]) 5.5  ? 1.0 Yes  ? 7.0  ?
reverse() 4.0  ? 1.0 Yes  ? 7.0  ?
shift() 5.5  ? 1.0 Yes  ? 7.0  ?
slice(start, end) 4.0  ? 1.0 Yes  ? 7.0  ?
sort(comparefn) 4.0  ? 1.0 Yes  ? 7.0  ?
splice(start, deleteCount [, item1 [, item2 [, ...]]]) 5.5  ? 1.0 Yes  ? 7.0  ?
unshift([item1 [, item2 [, ...]]]) 5.5  ? 1.0 Yes  ? 7.0  ?
Properties of instances length 4.0  ? 1.0 Yes  ? 7.0  ?

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of JavaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
Called as function String([value])  ?  ?  ?  ?  ?  ?  ?
Called as constructor new String([value]) 3.0  ? 1.0 Yes  ? 7.0  ?
Properties
prototype 4.0  ? 1.0 Yes  ? 7.0  ?
fromCharCode([char0 [, char1 [, ...]]]) 4.0  ? 1.0 Yes  ? 7.0  ?
Properties of prototype
constructor 4.0  ? 1.0 Yes  ? 7.0  ?
toString() 3.0  ? 1.0 Yes  ? 7.0  ?
valueOf() 3.0  ? 1.0 Yes  ? 7.0  ?
charAt(pos) 3.0  ? 1.0 Yes  ? 7.0  ?
charCodeAt(pos) 5.5  ? 1.0 Yes  ? 7.0  ?
concat([string1 [, string2 [, ...]]]) 4.0  ? 1.0 Yes  ? 7.0  ?
indexOf(searchString, position) 3.0  ? 1.0 Yes  ? 7.0  ?
lastIndexOf(searchString, position) 3.0  ? 1.0 Yes  ? 7.0  ?
localeCompare(that) 5.5  ? 1.0 Yes  ? 7.0  ?
match(regexp) 4.0  ? 1.0 Yes  ? 7.0  ?
replace(searchValue, replaceValue) 3.0  ? 1.0 Yes  ? 7.0  ?
search(regexp) 4.0  ? 1.0 Yes  ? 7.0  ?
slice(start, end) 4.0  ? 1.0 Yes  ? 7.0  ?
split(separator, limit) 4.0  ? 1.0 No  ? 7.0  ?
substring(start, end) 3.0  ? 1.0 Yes  ? 7.0  ?
toLowerCase() 3.0  ? 1.0 Yes  ? 7.0  ?
toLocaleLowerCase(comparefn) 3.0  ? 1.0 No  ? 7.0  ?
toUpperCase() 3.0  ? 1.0 Yes  ? 7.0  ?
toLocaleUpperCase() 3.0  ? 1.0 No  ? 7.0  ?
Additional properties of prototype substr(start, length) 4.0  ? 1.0 Yes  ? 7.0  ?
Properties of instances length 3.0  ? 1.0 Yes  ? 7.0  ?

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of JavaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
Called as function Boolean([value])  ?  ?  ?  ?  ?  ?  ?
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  ?

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of JavaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
Called as function Number([value])  ?  ?  ?  ?  ?  ?  ?
Called as constructor new Number([value]) 3.0  ? 1.0 Yes  ? 7.0  ?
Properties
prototype 4.0  ? 1.0 Yes  ? 7.0  ?
MAX_VALUE 4.0  ? 1.0 Yes  ? 7.0  ?
MIN_VALUE 4.0  ? 1.0 Yes  ? 7.0  ?
NaN 4.0  ? 1.0 Yes  ? 7.0  ?
NEGATIVE_INFINITY 4.0  ? 1.0 Yes  ? 7.0  ?
POSITIVE_INFINITY 4.0  ? 1.0 Yes  ? 7.0  ?
Properties of prototype constructor 4.0  ? 1.0 Yes  ? 7.0  ?
toString([radix]) 4.0  ? 1.0 Yes  ? 7.0  ?
toLocaleString() 5.5  ? 1.0 Yes  ? 7.0  ?
valueOf() 4.0  ? 1.0 Yes  ? 7.0  ?
toFixed(fractionDigits) 5.5  ? 1.0 Yes  ? 7.0  ?
toExponential(fractionDigits) 5.5  ? 1.0 Yes  ? 7.0  ?
toPrecision(precision) 5.5  ? 1.0 Yes  ? 7.0  ?

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of JavaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
Value properties E 3.0  ? 1.0 Yes  ? 7.0  ?
LN10 3.0  ? 1.0 Yes  ? 7.0  ?
LN2 3.0  ? 1.0 Yes  ? 7.0  ?
LOG2E 3.0  ? 1.0 Yes  ? 7.0  ?
LOG10E 3.0  ? 1.0 Yes  ? 7.0  ?
PI  ?  ? Yes  ?  ? Yes  ?
SQRT1_2 3.0  ? 1.0 Yes  ? 7.0  ?
SQRT2  ?  ? Yes  ?  ? Yes  ?
Function properties abs(x) 3.0  ? 1.0 Yes  ? 7.0  ?
acos(x) 3.0  ? 1.0 Yes  ? 7.0  ?
asin(x) 3.0  ? 1.0 Yes  ? 7.0  ?
atan(x) 3.0  ? 1.0 Yes  ? 7.0  ?
atan2(y, x) 3.0  ? 1.0 Yes  ? 7.0  ?
ceil(x) 3.0  ? 1.0 Yes  ? 7.0  ?
cos(x) 3.0  ? 1.0 Yes  ? 7.0  ?
exp(x) 3.0  ? 1.0 Yes  ? 7.0  ?
floor(x) 3.0  ? 1.0 Yes  ? 7.0  ?
log(x) 3.0  ? 1.0 Yes  ? 7.0  ?
max([value1 [, value2 [, ...]]]) 3.0  ? 1.0 Yes  ? 7.0  ?
min([value1 [, value2 [, ...]]]) 3.0  ? 1.0 Yes  ? 7.0  ?
pow(x, y) 3.0  ? 1.0 Yes  ? 7.0  ?
random(x) 3.0  ? 1.0 Yes  ? 7.0  ?
round(x) 3.0  ? 1.0 Yes  ? 7.0  ?
sin(x) 3.0  ? 1.0 Yes  ? 7.0  ?
sqrt(x) 3.0  ? 1.0 Yes  ? 7.0  ?
tan(x) 3.0  ? 1.0 Yes  ? 7.0  ?

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of JavaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
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  ? 7.0  ?
new Date (value) 4.0  ? 1.0 Yes  ? 7.0  ?
new Date () 4.0  ? 1.0 Yes  ? 7.0  ?
Properties
prototype 4.0  ? 1.0 Yes  ? 7.0  ?
parse(string) 3.0  ? 1.0 Yes  ? 7.0  ?
UTC (year, month [, date [, hours [, minutes [, seconds [, ms ]]]]]) 3.0  ? 1.0 Yes  ? 7.0  ?
Properties of prototype constructor 4.0  ? 1.0 Yes  ? 7.0  ?
toString() 4.0  ? 1.0 Yes  ? 7.0  ?
toDateString() 4.0  ? 1.0 Yes  ? 7.0  ?
toTimeString() 4.0  ? 1.0 Yes  ? 7.0  ?
toLocaleString() 4.0  ? 1.0 Yes  ? 7.0  ?
toLocaleDateString() 4.0  ? 1.0 Yes  ? 7.0  ?
toLocaleTimeString() 4.0  ? 1.0 Yes  ? 7.0  ?
valueOf() 4.0  ? 1.0 Yes  ? 7.0  ?
getTime() 3.0  ? 1.0 Yes  ? 7.0  ?
getFullYear() 4.0  ? 1.0 Yes  ? 7.0  ?
getMonth() 3.0  ? 1.0 Yes  ? 7.0  ?
getUTCMonth() 4.0  ? 1.0 Yes  ? 7.0  ?
getDate() 3.0  ? 1.0 Yes  ? 7.0  ?
getUTCDate() 4.0  ? 1.0 Yes  ? 7.0  ?
getDay() 3.0  ? 1.0 Yes  ? 7.0  ?
getUTCDay() 4.0  ? 1.0 Yes  ? 7.0  ?
getHours() 3.0  ? 1.0 Yes  ? 7.0  ?
getUTCHours() 4.0  ? 1.0 Yes  ? 7.0  ?
getMinutes() 3.0  ? 1.0 Yes  ? 7.0  ?
getUTCMinutes() 4.0  ? 1.0 Yes  ? 7.0  ?
getSeconds() 3.0  ? 1.0 Yes  ? 7.0  ?
getUTCSeconds() 4.0  ? 1.0 Yes  ? 7.0  ?
getMilliseconds() 4.0  ? 1.0 Yes  ? 7.0  ?
getUTCMilliseconds() 4.0  ? 1.0 Yes  ? 7.0  ?
getTimezoneOffset() 4.0  ? 1.0 Yes  ? 7.0  ?
setTime(time) 3.0  ? 1.0 Yes  ? 7.0  ?
setMilliseconds(ms) 4.0  ? 1.0 Yes  ? 7.0  ?
setUTCMilliseconds(ms) 4.0  ? 1.0 Yes  ? 7.0  ?
setSeconds(sec [, ms]) 3.0  ? 1.0 Yes  ? 7.0  ?
setUTCSeconds(sec [, ms]) 4.0  ? 1.0 Yes  ? 7.0  ?
setMinutes(min [, sec [, ms]]) 3.0  ? 1.0 Yes  ? 7.0  ?
setUTCMinutes(min [, sec [, ms]]) 4.0  ? 1.0 Yes  ? 7.0  ?
setHours(hour [, min [, sec [, ms]]]) 4.0  ? 1.0 Yes  ? 7.0  ?
setUTCHours(hour [, min [, sec [, ms]]]) 4.0  ? 1.0 Yes  ? 7.0  ?
setDate(date) 4.0  ? 1.0 Yes  ? 7.0  ?
setUTCDate(date) 4.0  ? 1.0 Yes  ? 7.0  ?
setMonth(month [, date]) 3.0  ? 1.0 Yes  ? 7.0  ?
setUTCMonth(month [, date]) 4.0  ? 1.0 Yes  ? 7.0  ?
setFullYear(year [, month [, date]]) 4.0  ? 1.0 Yes  ? 7.0  ?
setUTCFullYear(year [, month [, date]]) 4.0  ? 1.0 Yes  ? 7.0  ?
toUTCString() 4.0  ? 1.0 Yes  ? 7.0  ?
Additional properties of prototype getYear() 3.0  ? 1.0 Yes  ? 7.0  ?
setYear(year) 3.0  ? 1.0 Yes  ? 7.0  ?
toGMTString() 4.0  ? 1.0 Yes  ? 7.0  ?

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of JavaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
Called as function RegExp (pattern, flags)  ?  ?  ?  ?  ?  ?  ?
Called as constructor new RegExp (pattern, flags) 4.0  ? 1.0 Yes  ? 7.0  ?
Properties
prototype 4.0  ? 1.0 Yes  ? 7.0  ?
Properties of prototype constructor 4.0  ? 1.0 Yes  ? 7.0  ?
exec(string) 4.0  ? 1.0 Yes  ? 7.0  ?
test(string) 4.0  ? 1.0 Yes  ? 7.0  ?
toString() 4.0  ? 1.0 Yes  ? 7.0  ?
Properties of instances source 4.0  ? 1.0 Yes  ? 7.0  ?
global 4.0  ? 1.0 Yes  ? 7.0  ?
ignoreCase 5.5  ? 1.0 Yes  ? 7.0  ?
multiline 5.5  ? 1.0 Yes  ? 7.0  ?
lastIndex 4.0  ? 1.0 Yes  ? 7.0  ?

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of JavaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
Called as function Error (message)  ?  ?  ?  ?  ?  ?  ?
Called as constructor new Error (message) 5.0  ? 1.0 Yes  ? 7.0  ?
Properties
prototype 5.0  ? 1.0 Yes  ? 7.0  ?
Properties of prototype constructor 5.0  ? 1.0 Yes  ? 7.0  ?
name 5.5  ? 1.0 Yes  ? 7.0  ?
message 5.5  ? 1.0 Yes  ? 7.0  ?
toString() 5.0  ? 1.0 Yes  ? 7.0  ?

Trident Tasman Gecko WebCore KHTML Presto iCab
Name of JavaScript Engine JScript JScript SpiderMonkey JavaScriptCore KJS linear b/futhark InScript
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
prototype  ?  ?  ?  ?  ?  ?  ?
Properties of prototype constructor  ?  ?  ?  ?  ?  ?  ?
name  ?  ?  ?  ?  ?  ?  ?
message  ?  ?  ?  ?  ?  ?  ?


  • Webdevout — mostly covers Windows browsers. Extensive bug testing.
v • d • e
Layout engines
List of layout engines Trident · Presto · Gecko · Tasman · WebCore · KHTML · iCab · Prince · GtkHTML · Gzilla · Boxely · Tkhtml · Robin
Comparison of layout engines HTML · XML · XHTML · Graphics · CSS · DOM · HTML 5 · ECMAScript · SVG
  This Web software related article is a stub. You can help by expanding it.
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