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JavaScript Introduction

JavaScript is the world's most popular programming language. It is the language for the Web, for computers, servers, and more.

Why Study JavaScript?

JavaScript is one of the 3 languages all web developers must learn:

  1. HTML to define the content of web pages
  2. CSS to specify the layout of web pages
  3. JavaScript to program the behavior of web pages

Example

JavaScript can change HTML content. One of many JavaScript HTML methods is getElementById().

html
<p id="demo">JavaScript can change HTML content.</p>
<button type="button" onclick='document.getElementById("demo").innerHTML = "Hello JavaScript!"'>Click Me</button>
Try it Yourself

Test Yourself with an Exercise

Inside which HTML element do we put the JavaScript?

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