JavaScript
Versions
JavaScript
was invented by Brendan Eich in 1995, and became an ECMA standard in 1997.
ECMA-262 is
the official name of the standard. ECMAScript is the official name of the
language.
ECMAScript
Editions
Year Name Description
1997 ECMAScript 1 First
Edition.
1998 ECMAScript 2 Editorial
changes only.
1999 ECMAScript 3 Added
Regular Expressions.
Added
try/catch.
ECMAScript
4 Was never released.
2009 ECMAScript 5 Added
"strict mode".
Added JSON
support.
2011 ECMAScript 5.1 Editorial changes.
2015 ECMAScript 6 Added
classes and modules.
2016 ECMAScript 7 Added
exponential operator (**).
Added Array.prototype.includes.
ECMAScript
6 is also called ECMAScript 2015.
ECMAScript 7
is also called ECMAScript 2016.
Browser
Support
ECMAScript 3
is fully supported in all browsers.
ECMAScript 5
is fully supported in all modern browsers*.
ECMAScript 6
is partially supported in all modern browsers.
ECMAScript 7
is poorly supported in all browsers.
* Internet
Explorer 9 does not support ECMAScript 5 "use strict".
ECMAScript
Browser Implementations
Engine ECMA Browser
V8 6 Chrome
(Partial Support)
SpiderMonkey 6 Firefox
(Partial Support)
Chakra 6 Edge
(Partial Support)
Nitro 6 Safari
(Partial Support)
V8 6 Opera
(Partial Support)
V8 5 Chrome
23
SpiderMonkey 5 Firefox
21
JavaScript
1.8.5 5 Firefox
4
Nitro 5 Safari
6
V8 5 Opera
15
Chakra 5 Edge
12
Chakra 5 IE
10
JavaScript /
ECMAScript / JScript
JavaScript
was developed for Netscape. The first browser to run JavaScript was Netscape 2
in 1996. After Netscape the Mozilla foundation continued to develop JavaScript
for the Firefox browser. JavaScript version numbers run from 1.0 to 1.8.
ECMAScript
was developed by Ecma International after the organization adopted JavaScript.
The first edition of ECMAScript was released in 1997. ECMAScript version
numbers run from 1 to 7.
JScript was
developed by Microsoft as a compatible JavaScript language for Internet
Explorer in 1996. JScript version numbers runs from 1.0 to 9.0.
This
list compares the version numbers of the three different products:
Year JavaScript ECMA JScript Browser
1996 1.0
Netscape 2
1996 1.0 Internet Explorer 3
1996 1.1
Netscape 3
1997 1.2
Netscape 4
1997 1 3.0 Internet
Explorer 4
1998 1.3 1 Netscape
4.06
1999 2 5.0 Internet
Explorer 5
1999 2 5.1 Internet
Explorer 5.1
2000 3 5.5 Internet
Explorer 5.5
2000 1.5 3 Netscape
6
2000 1.5 3 Firefox
1
2001 3 5.6 Internet
Explorer 6
2006 3 5.7 Internet
Explorer 7
2005 1.6 3 Firefox
1.5
2006 1.7 3 Firefox
2
2008 1.8 3 Firefox
3
2009 3 5.8 Internet
Explorer 8
2009 1.8.1 5 Firefox
3.5 (Partial Support)
2009 1.8.2 5 Firefox
3.6 (Partial Support)
2011 1.8.5 5 Firefox
4
2011 5 9.0 Internet
Explorer 9 (Partial Support)
Internet
Explorer 4 (JScript 3.0) and Netscape 4.06 (JavaScript 1.3) were the first
browsers to support ECMAScript 1.
Internet
Explorer 5 (JScript 5.0) was the first browser to support ECMAScript 2.
Internet
Explorer 5.5 (JScript 5.5) and Netscape 6 (JavaScript 1.5) were the first
browsers to support ECMAScript 3.
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