Download Introduction to the DOM.mp4
🌐 Introduction to the DOM (Document Object Model)
The DOM (Document Object Model) is a programming interface for web documents. It represents the structure of a web page so that programming languages like JavaScript can interact with and manipulate the content, structure, and style dynamically.
🔍 What is the DOM?
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The DOM is a tree-like structure that represents the HTML (or XML) content of a web page.
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Each element, attribute, or piece of text in the HTML is represented as a node in the tree.
Example:
<!DOCTYPE html>
<html>
<head>
<title>My Page</title>
</head>
<body>
<h1>Hello, world!</h1>
</body>
</html>
DOM Tree Representation:
Document
└── html
├── head
│ └── title
└── body
└── h1
⚙️ How the DOM Works
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Browser parses HTML → creates the DOM tree.
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JavaScript can access and modify this tree:
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Add, change, or remove elements.
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Update content.
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React to user actions.
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🔧 Accessing the DOM with JavaScript
Common Methods:
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document.getElementById('id')– Selects an element by ID. -
document.querySelector('.class')– Selects the first matching element. -
document.createElement('tag')– Creates a new element. -
element.appendChild(newElement)– Adds a child to an existing element.
Example:
<p id="demo">Hello!</p>
<script>
document.getElementById("demo").textContent = "Hello, DOM!";
</script>
📌 Why the DOM is Important
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Enables dynamic content: Changing the page without reloading.
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Forms the foundation for interactive web applications.
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Essential for event handling, animations, and AJAX-based updates.
🧠 In Summary
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The DOM is a live representation of a web page.
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It allows developers to read and manipulate content and structure using JavaScript.
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Mastering the DOM is essential for frontend web development.
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