Beginning with ECMAScript

ECMAScript is a scripting language specification standardized by ECMA International. It was created to standardize JavaScript in an attempt to allow for independent and compatible implementations. ECMAScript 6, or ES6, was originally released in 2015 and has gone through several minor updates since then.

Note

You may refer to the following link for more information about ECMA specification:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Language_Resources.