The compiler incrementally optimizes the code.

The compiler starts optimization and compilation.

The interpreter starts the application.

Additionally, the overall execution of the JavaScript is a 5 step process, as shown in the below image: The JavaScript engine/JavaScript Interpreter comprises both an Interpreter and a Just in Time compiler. A typical architecture of a browser looks like below:Īs we can see, the browser's Rendering engine interacts with the ' JavaScript's Interpreter' and sends the JavaScript code to the JavaScript engine for processing. That’s the part of the browser that understands JavaScript and run JavaScript programs. However, most browsers also have a JavaScript interpreter. The part of the web browser that understands HTML and CSS is called the rendering engine. Additionally, we know that web browsers understand HTML and CSS and converting those languages into a visual display on the screen. JavaScript is an interpreted language where code is explained and executed at the runtime. Procedure to diagnose an error in JavaScript? How to embed an external JavaScript file in HTML?

How to embed and execute JavaScript in HTML ? Procedure to embed and execute JavaScript in the HTML tag? How to embed and execute JavaScript in a web-browser?

How does JavaScript run in a web-browser? Moreover, we will also understand how JavaScript can integrate under various sections of an HTML page. In the below sections, let's understand how does JavaScript run in a web browser and how the JavaScript engine interprets the JavaScript code. In the case of web applications, we can use any of the supported web browsers as a platform for executing JavaScript. Being a client-side scripting language, JavaScript needs some clients to interpret and execute it.

Javascript is required