ES5+ refers to ECMAScript 5 and later versions of the JavaScript language specification. ECMAScript is the standardized scripting language that JavaScript is based on. ES5 introduced features like strict mode, JSON support, and new array methods. ES6 (also known as ES2015) brought significant changes, including arrow functions, classes, template literals, let and const keywords, modules, and more. Subsequent versions (ES7, ES8, ES9, etc.) continue to add smaller but useful features to the language. 'ES5+' is a general term used when discussing JavaScript features available in ES5 and any later version, highlighting modern JavaScript practices.
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