ECMAScript is the official name of the language.
From 2015 ECMAScript is named by year (ECMAScript 2015).
|1||ECMAScript 1 (1997)||First Edition.|
|2||ECMAScript 2 (1998)||Editorial changes only.|
|3||ECMAScript 3 (1999)||Added Regular Expressions.
|4||ECMAScript 4||Never released.|
|5||ECMAScript 5 (2009)
Read More: JS ES5
Added "strict mode".
Added JSON support.
Added Array Iteration Methods.
|5.1||ECMAScript 5.1 (2011)||Editorial changes.|
Read More: JS ES6
|Added let and const.
Added default parameter values.
|7||ECMAScript 2016||Added exponential operator (**).
|8||ECMAScript 2017||Added string padding.
Added new Object properties.
Added Async functions.
Added Shared Memory.
Added rest / spread properties.
Added Asynchronous iteration.
Additions to RegExp.
ECMAScript is often abbreviated to ES.
ECMAScript 3 is fully supported in all browsers.
ECMAScript 5 is fully supported in all modern browsers.
Browser Support for ES5 (2009)
|IE / Edge||10||Sep 2012|
* Internet Explorer 9 does not support ECMAScript 5 "use strict".
Browser Support for ES6 (ECMAScript 2015)
Internet Explorer does not support ECMAScript 2015.
Browser Support for ES7 (ECMAScript 2016)
The first edition of ECMAScript was released in 1997.
This list compares the version numbers of the different products:
|1997||ECMAScript 1||IE 4|
|1999||ECMAScript 2||IE 5|
|2000||ECMAScript 3||IE 5.5|
|2011||ECMAScript 5||IE 9 (Except "use strict")|
|2011||1.8.5||Firefox 4 (Except leading zeroes in parseInt)|
|2015||ECMAScript 2015||Partially Supported in all Browser|
IE 4 was the first browser to support ECMAScript 1 (1997).
IE 5 was the first browser to support ECMAScript 2 (1999).
IE 5.5 was the first browser to support ECMAScript 3 (2000).
IE 9* was the first browser to support ECMAScript 5 (2011).
Internet Explorer 9 does not support ECMAScript 5 "use strict".
Chrome 23, IE 10, and Safari 6 were the first browsers to fully support ECMAScript 5:
|Chrome 23||IE10 / Edge||Firefox 21||Safari 6||Opera 15|
|Sep 2012||Sep 2012||Apr 2013||Jul 2012||Jul 2013|