Runtime (Browser Environment)

JavaScript alone = language

But it needs a runtime to run

Browser = Runtime

Browser gives:

DOM (Document Object Model)
APIs (fetch, setTimeout, etc.)
Event system

Example

console.log("Hello");

console.log() is NOT pure JS

It is provided by the browser runtime

Runtime Components

Includes:

Call Stack
Web APIs
Event Loop
Callback Queue

👉 You’ll learn these deeply later (advanced level)