JS Fundamentals 5 min readLesson 1 of 2
JavaScript Introduction
Understand JavaScript fundamentals, script placement, and changing HTML dynamically.
### What is JavaScript? JavaScript is the world's most popular programming language. It is the programming language of the Web.
What Can JavaScript Do? - Change HTML content dynamically. - Change HTML attribute values & CSS styles. - Hide and show HTML elements. - Handle user interactions, events, and API requests.
javascript
document.getElementById("demo").innerHTML = "Hello JavaScript!";
```Interactive Sandbox
JavaScript Interactive Counter App
Live W3-EditorEdit code below and see instant live output in the preview box
Source Code InputHTML / CSS / JS
Live Browser Result Live Result
Test Yourself With Exercises
Verify your understanding before moving to the next topic
Inside which HTML element do we put JavaScript code?
First Lesson of Course
Next: JS Variables & Data Types ❯