JavaScript DOM and BOM

This section covers the questions for JavaScript DOM and BOM to clear all your concepts.

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Question 1

Which method is used to select an element by its ID?

  • getElementByClass()

  • getElementById()

  • querySelectorAll()

  • getById()

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Question 2

What does document.querySelectorAll() return?

  • An array of elements

  • A single element

  • A NodeList

  • Undefined

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Question 3

How do you change the inner text of an element in the DOM?

  • element.innerText = "New Text";

  • element.textContent = "New Text";

  • element.innerHTML = "New Text";

  • All of the above

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Question 4

What does window.location.href return?

  • The browser's name

  • The URL of the current page

  • The history of visited pages

  • The cookies of the website

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Question 5

What is the purpose of window.history.back()?

  • To navigate to the next page in history

  • To reload the current page

  • To navigate to the previous page in history

  • To clear the browser's history

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Question 6

Which method is used to set a cookie?

  • document.cookie = "key=value";

  • window.setCookie()

  • navigator.cookie()

  • cookie.set()

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Question 7

What will the following code output?

JavaScript 
console.log(window.navigator.userAgent);


  • Browser and device information

  • URL of the current page

  • Cookies of the website

  • Undefined

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Question 8

Which event is triggered when the DOM is fully loaded?

  • onload

  • DOMContentLoaded

  • load

  • domComplete

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Question 9

How do you remove an element from the DOM?

  • element.remove();

  • element.delete();

  • element.destroy();

  • element.clear();

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Question 10

What does window.alert() do?

  • Logs a message to the console

  • Shows a confirmation box

  • Displays an alert box with a message

  • Refreshes the browser

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There are 10 questions to complete.

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