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🌐 DOM Interview Questions for Beginners – With Answers

Sure! Here's a simple and clear blog post about DOM (Document Object Model) Interview Questions that can help you learn and prepare.

🌐 DOM Interview Questions for Beginners – With Answers

The DOM (Document Object Model) is a key part of web development. It lets JavaScript interact with HTML and CSS to make web pages dynamic and interactive.

Here’s a helpful list of DOM interview questions—with answers—to guide your preparation.

✅ 1. What is the DOM?

Answer:
DOM stands for Document Object Model. It’s a programming interface for HTML and XML documents. The DOM represents the page as a tree structure, where each node is an object representing part of the document.

✅ 2. What are DOM methods?

Answer:
DOM methods are functions provided by the browser to interact with the HTML document.

Some common methods:

  • getElementById()
  • getElementsByClassName()
  • querySelector()
  • createElement()
  • appendChild()
  • removeChild()

✅ 3. What is the difference between getElementById() and querySelector()?

Answer:

  • getElementById("id") – selects one element with the given ID.
  • querySelector("selector") – selects the first element that matches a CSS selector (like .class, #id, tag).

Example:

document.getElementById("title");
document.querySelector("#title");
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Both can select the same element, but querySelector is more flexible.

✅ 4. How do you create and add a new element using JavaScript?

Answer:

let newDiv = document.createElement("div");
newDiv.textContent = "Hello!";
document.body.appendChild(newDiv);
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✅ 5. What is the difference between innerHTML, innerText, and textContent?

Answer:

  • innerHTML – gets or sets HTML content inside an element.
  • innerText – gets or sets visible text (respects CSS).
  • textContent – gets or sets all text, even hidden by CSS.

✅ 6. What are DOM events?

Answer:
Events are actions like clicks, typing, or mouse movements. JavaScript can listen for these and respond.

Example:

document.getElementById("btn").addEventListener("click", function() {
  alert("Button clicked!");
});
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✅ 7. How can you remove an element from the DOM?

Answer:

let element = document.getElementById("removeMe");
element.remove();
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✅ 8. What is event bubbling?

Answer:
Event bubbling means the event starts from the target element and moves up to its ancestors.

You can stop it using:

event.stopPropagation();
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✅ 9. What is the difference between append() and appendChild()?

Answer:

  • append() – allows adding multiple nodes or strings.
  • appendChild() – only adds one node and returns it.

Example:

parent.append("Hello", childNode);
parent.appendChild(childNode); // only one node
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✅ 10. What are some common DOM properties?

Answer:

  • innerHTML
  • className
  • id
  • value (for inputs)
  • style
  • children
  • parentNode

📝 Final Tips

  • Practice by manipulating real HTML in the browser console.
  • Use CodePen or JSFiddle for live DOM experiments.
  • Understand how events and the DOM tree work.

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