JavaScript DOM Manipulation Quiz

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Question 1/15

How can you access the first child of a DOM element?

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Question 2/15

What method would you use to unregister a previously registered event handler?

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Question 3/15

If you want to hide an element on a webpage using JavaScript, which CSS property would you modify?

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Question 4/15

Which method allows you to execute a function after a specified number of milliseconds?

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Question 5/15

How can you prevent a form submission in JavaScript? 
form.addEventListener('submit', function(event) {
  event.preventDefault();
});

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Question 6/15

Which DOM method is used to create a new HTML element?

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Question 7/15

What method would you use to select an element by its ID in the DOM?

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Question 8/15

When using insertBefore(), where is the new node placed? 
var parent = document.getElementById('parent');
parent.insertBefore(newNode, referenceNode);

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Question 9/15

When is the resize event fired in the browser?

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Question 10/15

How would you stop the propagation of an event in the capture or bubbling phases? 
element.addEventListener('click', function(event) {
  event.stopPropagation();
});

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Question 11/15

To add a new class to an element's class list, which method would you use?

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Question 12/15

Which method is used to append a new element as the last child of a parent element? 
// Example of appending a new child
parentElement.appendChild(newElement);

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Question 13/15

How do you remove a child node from a parent node in the DOM? 
// Example to remove a child element
element.removeChild(childElement);

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Question 14/15

Which method would you use to clone a DOM node?

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Question 15/15

To get all elements of a specific class, which method would you use?

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Your Results

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Your Answers

Question 1/15
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How can you access the first child of a DOM element?

Available answers

The 
element.firstChild
property returns the first child of an element.
Question 2/15
😊 Your answer was correct 🙁 Your answer was incorrect
What method would you use to unregister a previously registered event handler?

Available answers

The 
removeEventListener()
method removes an event handler that has been attached with 
addEventListener()
.
Question 3/15
😊 Your answer was correct 🙁 Your answer was incorrect
If you want to hide an element on a webpage using JavaScript, which CSS property would you modify?

Available answers

Setting the 
style.display
property to 'none' hides the element from view, breaking the page flow.
Question 4/15
😊 Your answer was correct 🙁 Your answer was incorrect
Which method allows you to execute a function after a specified number of milliseconds?

Available answers

The 
setTimeout()
method calls a function or evaluates an expression after a specified number of milliseconds.
Question 5/15
😊 Your answer was correct 🙁 Your answer was incorrect
How can you prevent a form submission in JavaScript? 
form.addEventListener('submit', function(event) {
  event.preventDefault();
});

Available answers

Calling 
event.preventDefault()
on a form submission event prevents the form from being submitted.
Question 6/15
😊 Your answer was correct 🙁 Your answer was incorrect
Which DOM method is used to create a new HTML element?

Available answers

The 
document.createElement()
method creates the HTML element specified by tagName, or an HTMLUnknownElement if tagName isn't recognized.
Question 7/15
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What method would you use to select an element by its ID in the DOM?

Available answers

The 
document.getElementById()
method returns an element object representing the element whose id property matches the specified string.
Question 8/15
😊 Your answer was correct 🙁 Your answer was incorrect
When using <code>insertBefore()</code>, where is the new node placed? 
var parent = document.getElementById('parent');
parent.insertBefore(newNode, referenceNode);

Available answers

The 
insertBefore(newNode, referenceNode)
method inserts newNode into the DOM before referenceNode as a child of the specified parent node.
Question 9/15
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When is the <code>resize</code> event fired in the browser?

Available answers

The 
resize
event is fired when the document view (window) has been resized.
Question 10/15
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How would you stop the propagation of an event in the capture or bubbling phases? 
element.addEventListener('click', function(event) {
  event.stopPropagation();
});

Available answers

Calling 
event.stopPropagation()
during any phase of event flow prevents further propagation of the current event.
Question 11/15
😊 Your answer was correct 🙁 Your answer was incorrect
To add a new class to an element's class list, which method would you use?

Available answers

The 
element.classList.add()
method adds the specified class value to the element's class attribute.
Question 12/15
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Which method is used to append a new element as the last child of a parent element? 
// Example of appending a new child
parentElement.appendChild(newElement);

Available answers

The 
parentElement.appendChild(newElement)
method adds a node to the end of the list of children of a specified parent node.
Question 13/15
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How do you remove a child node from a parent node in the DOM? 
// Example to remove a child element
element.removeChild(childElement);

Available answers

The correct method to remove a child node is 
parentNode.removeChild(childNode)
, where you specify the parentNode and the childNode you want to remove.
Question 14/15
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Which method would you use to clone a DOM node?

Available answers

The 
element.cloneNode()
method returns a duplicate of the node on which it is called, while the parameter indicates whether or not to include child nodes.
Question 15/15
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To get all elements of a specific class, which method would you use?

Available answers

The 
document.getElementsByClassName()
method returns a live HTMLCollection of elements with the specified class name.