As we already know, JavaScript is a language that runs mostly on browsers (as well as in servers using NodeJS, and in desktop and mobile devices), and each browser can implement its own version of the available functionalities of JavaScript (as you will learn later on in this book). This specific implementation is based on ECMAScript. Thus, the browsers offer mostly the same functionalities (our JavaScript code will run in all browsers); however, each functionality's behavior may be a little bit different from browser to browser.
All the code presented in this chapter so far is based on ECMAScript 5 (ES5 - ES is simply short for ECMAScript), which became a standard in December 2009. ECMAScript ...
