# The JavaScript Runtime

What a JavaScript runtime is, and how the browser loads a page's HTML, CSS and JavaScript and runs the script.

![Cheat sheet: The JavaScript Runtime](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/9b9c3e37fbfe4b5cb7c7e2e637905cb6.webp)

- Category: JavaScript
- Level: Novice
- Tags: JavaScript, JavaScript Runtime
- Updated: November 3, 2026

Source: https://www.ask-codey.com/cheat-sheets/the-javascript-runtime-cheat-sheet