- JavaScript is one of the most important components in web development alongside HTML (HyperText Markup Language) and CSS (Cascading Style Sheets).
- More than 97% of the websites on the internet use JavaScript to add interesting behaviors to their webpages.
- JavaScript is a client-side scripting language that runs inside a web browser.
- All top web browsers have built-in JavaScript engines to deal with JavaScript content. The JS engine is useful for running JavaScript inside web browsers.
- JavaScript is a high-level programming (scripting) language.
- JavaScript is a JIT (just-in-time) compiled language.
- JavaScript has dynamic typing, prototype-based object-orientation, and first-class functions.
- JavaScript follows ECMA standard. ECMAScript is a JavaScript standard meant to ensure the interoperability of web pages across different web browsers.
- ECMAScript first appeared in 1997.
- ECMAScript Language Specification defines the ECMAScript Language.
- JavaScript files are identified with .js extension. Browsers have an ability to execute JavaScripts, thanks to the in-built JavaScript engine.
- JavaScript can be included in web pages in different ways. By embedding JavaScript inside a webpage itself inside an enclosed <script></script> tag. By including a local file using <script src=””></script> tag. Remote JavaScript can be included in the web page inside a <script></script> tag.
