JavaScript DOM Manipulation: Interactive Learning Quizzes

Question 1

To access a DOM element by its id, which JavaScript method should you use?

Accepted Answer

getElementById('example')

Answer

getElementByClassName('example')

Answer

getElementByName('example')

Answer

getElementsByTagName('example')

Question 2

Which property allows you to dynamically change the background color of an HTML element in JavaScript?

Accepted Answer

element.style.backgroundColor

Answer

element.background.style

Answer

element.backgroundColor.style

Answer

style.backgroundColor

Question 3

What is the main purpose of the 'getElementById' method in JavaScript?

Accepted Answer

Retrieves an HTML element by its unique ID

Answer

Sets the ID attribute of an HTML element

Answer

Creates a new HTML element with a given ID

Answer

Removes an HTML element from the DOM

Question 4

Which event listener is commonly used to capture user clicks on an HTML element in JavaScript?

Accepted Answer

onclick

Answer

onload

Answer

onhover

Answer

onchange

Question 5

What is the correct syntax to create a new HTML element using JavaScript?

Accepted Answer

document.createElement('element_name')

Answer

element.create('element_name')

Answer

new Element('element_name')

Answer

createElement('element_name')

Question 6

Which method is used to append a newly created element to an existing DOM node in JavaScript?

Accepted Answer

appendChild

Answer

insertChild

Answer

addElement

Answer

addBefore

Question 7

What is a potential security concern related to DOM manipulation in JavaScript applications?

Accepted Answer

Cross-site scripting (XSS) attacks

Answer

Denial of Service (DoS) attacks

Answer

Malware injection

Answer

Phishing attacks

Question 8

Which method is used to remove an element from the DOM in JavaScript?

Accepted Answer

removeChild

Answer

removeElement

Answer

deleteElement

Answer

removeNode

Question 9

Which method is used to set the inner HTML content of an element in JavaScript?

Accepted Answer

innerHTML

Answer

outerHTML

Answer

innerText

Answer

textContent

Question 10

What is the key difference between the 'getElementById' and 'querySelector' methods in JavaScript?

Accepted Answer

getElementById selects by ID, while querySelector selects by CSS selector

Answer

querySelector selects by ID, while getElementById selects by CSS selector

Answer

They both do the same thing

Answer

getElementById is more efficient for simple ID selection

Question 11

Which of the following methods is NOT used for manipulating HTML elements in the DOM?

Accepted Answer

removeEventListener

Answer

getElementById

Answer

innerHTML

Answer

createElement

Question 12

What is the primary purpose of the DOM API?

Accepted Answer

To dynamically modify and interact with web page content

Answer

To fetch and display data from a database

Answer

To manage the layout and styling of a web page

Answer

To provide access to the computer's file system

Question 13

Which property is used to retrieve the text content within an HTML element?

Accepted Answer

textContent

Answer

innerText

Answer

innerHTML

Answer

nodeValue

Question 14

What is the distinction between the 'getElementById' and 'getElementsByClassName' methods?

Accepted Answer

'getElementById' returns a single element by its unique ID, while 'getElementsByClassName' returns a collection of elements by their shared class name

Answer

They both return a single element, but 'getElementById' uses an ID while 'getElementsByClassName' uses a class name

Answer

They both return a collection of elements, but 'getElementById' uses an ID while 'getElementsByClassName' uses a class name

Answer

There is no distinction between these methods

Question 15

Which event listener is used to handle user clicks on an element?

Accepted Answer

onclick

Answer

onmouseover

Answer

onkeypress

Answer

onchange

Question 16

What valid data type can store HTML elements in a JavaScript variable?

Accepted Answer

Both HTMLCollection and NodeList

Answer

HTMLCollection

Answer

NodeList

Answer

Element

Question 17

What is the purpose of using the 'addEventListener' method?

Accepted Answer

To attach an event handler function to an element

Answer

To remove an event handler from an element

Answer

To check if an event handler is attached to an element

Answer

To trigger an event manually

Question 18

How is the DOM related to the HTML document?

Accepted Answer

The DOM is an in-memory representation of the HTML document

Answer

The HTML document is a representation of the DOM in the web browser

Answer

The DOM and HTML document are separate entities that do not interact

Answer

There is no relationship between the DOM and the HTML document

Question 19

Which JavaScript method is used to add an event listener to an HTML element?

Accepted Answer

addEventListener()

Answer

attachListener()

Answer

registerEvent()

Answer

addEvent()

Question 20

What does the 'DOMContentLoaded' event signify?

Accepted Answer

The HTML document has finished loading

Answer

The CSS has finished loading

Answer

All page resources have finished loading

Answer

The page is fully interactive

Question 21

To retrieve the width of an HTML element using JavaScript, which property should you use?

Accepted Answer

offsetWidth

Answer

width

Answer

innerWidth

Answer

clientWidth

Question 22

In JavaScript, how do you create a new HTML element?

Accepted Answer

createElement('elementName')

Answer

create('elementName')

Answer

new Element('elementName')

Answer

element.createElement('elementName')

Question 23

Which of the following methods is NOT available for the NodeList object in JavaScript?

Accepted Answer

push()

Answer

length

Answer

forEach()

Answer

item()

Question 24

When handling events in JavaScript, what does the 'this' keyword refer to within an event handler?

Accepted Answer

The HTML element that triggered the event

Answer

The event object

Answer

The window object

Answer

The document object

Question 25

In JavaScript, which function is used to retrieve an HTML element by its ID?

Accepted Answer

getElementById()

Answer

querySelector()

Answer

getElementsByTagName()

Answer

getElementByName()

Question 26

What is the distinction between innerHTML and outerHTML?

Accepted Answer

innerHTML retrieves only the element's content, while outerHTML retrieves the entire element

Answer

outerHTML retrieves only the element's content, while innerHTML retrieves the entire element

Answer

They both retrieve the entire element, there is no distinction

Answer

They both retrieve only the element's content, there is no distinction

Question 27

Which JavaScript expression is correct for manipulating the CSS style of an element?

Accepted Answer

element.style.color = 'red'

Answer

element.style('color', 'red')

Answer

element.setStyle('color', 'red')

Answer

element.setCssStyle('color', 'red')

Question 28

What is the purpose of the 'defer' attribute in a <script> tag?

Accepted Answer

delays script execution until the page has finished loading

Answer

forces immediate script execution

Answer

runs the script concurrently with page loading

Answer

prevents script caching

Question 29

How can DOM manipulation and event handling work together to create an interactive form that checks user input?

Accepted Answer

Event listeners capture user input, while DOM methods change the form's appearance and show validation messages.

Answer

CSS styles can change the form's appearance based on user input.

Answer

JavaScript functions can check user input without changing the DOM.

Answer

DOM manipulation can make a new form from scratch.

Question 30

What are the potential drawbacks of neglecting best practices when manipulating the Document Object Model (DOM) in JavaScript?

Accepted Answer

Diminished website performance and accessibility

Answer

Enhanced website performance and accessibility

Answer

Negligible impact on website performance and accessibility

Answer

Improved website security and user experience

Question 31

How does JavaScript allow for dynamic modification of DOM element styling?

Accepted Answer

style property

Answer

querySelector

Answer

innerHTML

Question 32

What is the Document Object Model (DOM) in the context of web development?

Accepted Answer

A hierarchical representation of the web page's structure

Answer

A programming language specifically designed for web development

Answer

A collection of only the images on a web page

Answer

A tool primarily used for formatting text on a web page

Question 33

In DOM manipulation, what's the best way to handle cross-browser compatibility?

Accepted Answer

Check for browser differences and adjust code

Answer

Use the same API for all browsers

Answer

Don't use DOM manipulation

Question 34

Which JavaScript method allows you to modify the inner content of an HTML element?

Accepted Answer

innerHTML

Answer

appendChild()

Answer

insertBefore()

Answer

createElement()

Question 35

What property can be used to access an element's CSS style?

Accepted Answer

element.style

Answer

element.css

Answer

element.properties

Answer

element.appearance

Question 36

Which event listener is triggered when an element is clicked?

Accepted Answer

onclick

Answer

onchange

Answer

onhover

Answer

onfocus

Question 37

What is the effect of the following code: `document.getElementById('myElement').remove()`?

Accepted Answer

Removes an element from the DOM

Answer

Adds an element to the DOM

Answer

Modifies the element's style

Answer

Changes the element's content

Question 38

Which JavaScript object represents the history of the web page?

Accepted Answer

window.history

Answer

document.history

Answer

browser.history

Answer

history.browsing

Question 39

What is the primary use of the querySelector() method?

Accepted Answer

Gets an element by its CSS selector

Answer

Gets an element by its ID

Answer

Gets a list of elements by their class name

Answer

Gets all elements by their tag name

Question 40

Which attribute specifies the target frame for a hyperlink?

Accepted Answer

target

Answer

href

Answer

src

Answer

id

Question 41

Which JavaScript method is used to retrieve an element by its ID from the DOM?

Accepted Answer

getElementById

Answer

getElementByID

Answer

selectById

Answer

findId

Question 42

What is the purpose of the 'innerHTML' property in the DOM?

Accepted Answer

To set or get the HTML content of an element

Answer

To set or get the CSS style of an element

Answer

To add or remove event listeners to an element

Answer

To create a new element in the DOM

Question 43

Which event listener is used to detect when the mouse hovers over an element?

Accepted Answer

onmouseover

Answer

onclick

Answer

onchange

Answer

onfocus

Question 44

What is the result of setting the 'visibility' property of an element to 'hidden'?

Accepted Answer

The element will be hidden from view

Answer

The element will be removed from the DOM

Answer

The element will be disabled

Answer

The element will be highlighted

Question 45

Which method is used to insert a new element into the DOM before another existing element?

Accepted Answer

insertBefore

Answer

appendChild

Answer

createElement

Answer

removeChild

Question 46

What is the difference between 'innerHTML' and 'textContent' properties in the DOM?

Accepted Answer

innerHTML includes HTML tags while textContent does not

Answer

textContent includes HTML tags while innerHTML does not

Answer

They both include HTML tags

Answer

They both exclude HTML tags

Question 47

Which of the following is a valid CSS selector to retrieve the element with the ID 'container'?

Accepted Answer

#container

Answer

.container

Answer

container

Answer

.#container

Question 48

What is the purpose of the 'children' property in the DOM?

Accepted Answer

To get a list of all child elements of a given element

Answer

To get the parent element of a given element

Answer

To remove all child elements of a given element

Answer

To create new child elements for a given element

Question 49

Which method is used to replace an existing element in the DOM with a new one?

Accepted Answer

replace

Answer

update

Answer

modify

Answer

change

Question 50

Which method is used to select an element based on its unique identifier (ID)?

Accepted Answer

document.getElementById()

Answer

document.getElementsByTagName()

Answer

document.getElementByClassName()

Answer

document.querySelector()

Question 51

What property of an HTML element allows you to modify its text content?

Accepted Answer

.textContent

Answer

.value

Answer

.innerText

Answer

.innerHTML

Question 52

Which CSS property controls the positioning of an element on the web page?

Accepted Answer

position

Answer

display

Answer

margin

Answer

float

Question 53

What is the purpose of the 'this' keyword in JavaScript event listeners?

Accepted Answer

References the element that triggered the event

Answer

Defines a new variable

Answer

Not used in event listeners

Answer

Stores the event object

Question 54

Which property of an HTML element allows you to modify its style attributes?

Accepted Answer

element.style

Answer

element.styling

Answer

element.classList

Answer

element.css

Question 55

What is the key difference between the 'innerHTML' and 'textContent' properties of an HTML element?

Accepted Answer

innerHTML includes HTML tags, while textContent does not

Answer

They are interchangeable and have the same effect

Answer

textContent includes HTML tags, while innerHTML does not

Question 56

What is the purpose of a 'NodeList' in DOM manipulation?

Accepted Answer

Represents a collection of HTML elements that can be iterated over

Answer

Stores the parent element of all selected elements

Answer

Defines a new data type for storing elements