# How to Use HTML DOM API in JavaScript Published: 2026-02-14 · By Next-G Classes · Source: https://nextgclasses.com/blog/how-to-use-html-dom-api-in-javascript > Learn how to use the HTML DOM API in JavaScript with simple examples. Join NextG Classes to master web development, JavaScript, and frontend programming step by step.

If you are learning web development, understanding the HTML DOM API is very important. It helps JavaScript interact with your web page.

 

What is HTML DOM API?

DOM stands for Document Object Model.

The HTML DOM API allows JavaScript to:

DOM API lets JavaScript control your website.

How DOM Works

When a web page loads, the browser creates a structure (tree) of all HTML elements.

Example:

<h1 id="title">Hello World</h1>

JavaScript can access this using:

document.getElementById("title")
Common DOM API Methods (Important)

Select an Element  

document.getElementById("id") document.getElementsByClassName("class") document.querySelector("selector")

Example:

let heading = document.getElementById("title");

Change Content

heading.innerHTML = "Welcome to My Website";

Change Style

heading.style.color = "blue"; heading.style.fontSize = "30px";

Add Event (Button Click Example)

<button onclick="changeText()">Click Me</button> <script>function changeText() { document.getElementById("title").innerHTML = "Text Changed!"; } </script>

Create New Element

let para = document.createElement("p"); para.innerHTML = "This is a new paragraph"; document.body.appendChild(para);

Why HTML DOM API is Important?


Simple Real-Life Example

When you click a button and text changes, that is DOM API working.

Conclusion

The HTML DOM API allows JavaScript to control and modify web pages. It is one of the most important concepts in frontend development. If you want to become a web developer, mastering DOM API is a must.