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What is DOM Manipulation?

Last Updated: 8th September, 2026

DOM Manipulation means changing the structure, content, or style of a webpage using JavaScript.

You can:

Update text
Change styles
Add/remove elements
Modify attributes

Code Examples

1️⃣ Changing Content

let title = document.querySelector("#title");
title.textContent = "Welcome to DOM!";

2️⃣ Changing HTML

document.querySelector(".box").innerHTML = "<h2>Hello</h2>";

3️⃣ Changing Styles

document.querySelector("p").style.color = "blue";

4️⃣ Creating Elements

let btn = document.createElement("button");
btn.textContent = "Click Me";

document.body.appendChild(btn);

5️⃣ Removing Elements

document.querySelector(".item").remove();

Technical Example (Combined)

let div = document.querySelector(".container");

let newPara = document.createElement("p");
newPara.textContent = "New Content Added!";

div.appendChild(newPara);
div.style.backgroundColor = "lightgray";

This shows:

Element creation
Content update
Style change

Real Life Examples

1. Updating Cart Total

kukum 4 (1).png

When product is added:

Total price updates
Items list changes

total.textContent = "₹500";

2. Chat Application Messages

kukum 3 (1).png

let msg = document.createElement("p");
msg.textContent = "Hello!";
chatBox.appendChild(msg);

3. Showing / Hiding Elements

kukum 2 (1).png

element.style.display = "none";

Used in:

Dropdown menus
Password visibility
Modals

4. Dynamic Form Feedback

kukum (1).png

Module 3: DOM Manipulation

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