Transition property in CSS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a smooth color change effect on hover.

CSS

button {
  background-color: blue;
  transition: background-color [1];
}

button:hover {
  background-color: red;
}

Drag options to blanks, or click blank then click option'

A2s

Bcolor

Cease-in

Dall

Attempts:

3 left

💡 Hint

Common Mistakes

Using a property name instead of a time duration.

Leaving out the duration causes no visible transition.

The transition property needs a duration like 2s to specify how long the effect takes.

2fill in blank

medium

Complete the code to make the transition use an ease-in timing function.

CSS

div {
  width: 100px;
  transition: width 1s [1];
}

div:hover {
  width: 200px;
}

Drag options to blanks, or click blank then click option'

Aease

Blinear

Cease-out

Dease-in

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'linear' which moves at a constant speed.

Using 'ease-out' which starts fast and slows down.

The timing function ease-in makes the transition start slowly and speed up.

3fill in blank

hard

Fix the error in the transition shorthand property to smoothly change opacity over 0.5 seconds.

CSS

.box {
  opacity: 0.5;
  transition: [1] 0.5s ease;
}

.box:hover {
  opacity: 1;
}

Drag options to blanks, or click blank then click option'

Aopacity 0.5s

Bopacity

Call

Dopacity ease

Attempts:

3 left

💡 Hint

Common Mistakes

Including duration or timing inside the property name.

Using 'all' when only opacity should transition.

The transition property expects the property name first, then duration and timing. Here, duration and timing are already given, so only the property name 'opacity' is needed.

4fill in blank

hard

Fill both blanks to create a transition that changes both background color and transform over 0.3 seconds.

CSS

.card {
  transition: [1] [2];
}

.card:hover {
  background-color: yellow;
  transform: scale(1.1);
}

Drag options to blanks, or click blank then click option'

Abackground-color, transform

B0.3s

Cbackground-color, transform 0.3s

Dease

Attempts:

3 left

💡 Hint

Common Mistakes

Putting duration inside the property list.

Forgetting to separate properties with commas.

The first blank lists the properties separated by commas. The second blank is the duration for the transition.

5fill in blank

hard

Fill all three blanks to create a transition that changes color over 1 second with an ease-out timing function.

CSS

p {
  transition-property: [1];
  transition-duration: [2];
  transition-timing-function: [3];
}

p:hover {
  color: green;
}

Drag options to blanks, or click blank then click option'

Acolor

B1s

Cease-out

Dbackground-color

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'background-color' instead of 'color' when changing text color.

Mixing up duration and timing function values.

We specify the property to transition, the duration, and the timing function separately for clarity.

Practice

1. What does the CSS transition property do?

easy

A. It changes the HTML structure dynamically.

B. It instantly changes the style without any delay.

C. It disables all animations on the page.

D. It makes changes to CSS properties happen smoothly over time.

Solution

1. Step 1: Understand the purpose of transition

   The transition property is used to animate changes in CSS properties smoothly instead of instantly.

2. Step 2: Compare options with the definition

   Only It makes changes to CSS properties happen smoothly over time. correctly describes this behavior. Options A, B, and C describe unrelated or incorrect effects.

3. Final Answer:

   It makes changes to CSS properties happen smoothly over time. -> Option D

4. Quick Check:

   Transition = smooth change [OK]

Hint: Remember: transition = smooth change over time [OK]

Common Mistakes:

• Thinking transition instantly changes styles
• Confusing transition with animation keyframes
• Believing transition changes HTML structure

2. Which of the following is the correct syntax to apply a transition on the background-color property lasting 0.5 seconds?

easy

A. transition: background-color 0.5s;

B. transition: 0.5s background-color;

C. transition: background-color;

D. transition: 0.5s;

Solution

1. Step 1: Recall the correct order in transition syntax

   The syntax is transition: property duration; so property name comes first, then duration.

2. Step 2: Check each option

   transition: background-color 0.5s; matches the correct syntax. transition: 0.5s background-color; reverses order, A misses duration, D misses property name.

3. Final Answer:

   transition: background-color 0.5s; -> Option A

4. Quick Check:

   Property then duration = correct syntax [OK]

Hint: Syntax: transition: property duration; [OK]

Common Mistakes:

• Swapping property and duration order
• Omitting duration or property name
• Using invalid units for duration

3. Given this CSS:

button {
  background-color: blue;
  transition: background-color 1s;
}
button:hover {
  background-color: red;
}

What will happen when the user moves the mouse over the button?

medium

A. The button text color changes to red.

B. The background color changes instantly from blue to red.

C. The background color changes smoothly from blue to red over 1 second.

D. Nothing changes because transition is not applied.

Solution

1. Step 1: Understand the transition on background-color

   The button has a transition on background-color lasting 1 second, so changes to this property animate smoothly.

2. Step 2: Analyze the hover effect

   On hover, background-color changes from blue to red. Because of transition, this change happens gradually over 1 second.

3. Final Answer:

   The background color changes smoothly from blue to red over 1 second. -> Option C

4. Quick Check:

   Transition + hover = smooth color change [OK]

Hint: Hover triggers transition for smooth property change [OK]

Common Mistakes:

• Expecting instant color change ignoring transition
• Confusing background-color with text color
• Thinking transition applies without property change

4. Identify the error in this CSS code:

.box {
  width: 100px;
  transition: 2s width;
}
.box:hover {
  width: 200px;
}

medium

A. The width property cannot be transitioned.

B. The transition duration and property order is incorrect.

C. The hover selector is invalid.

D. There is no error; the code works correctly.

Solution

1. Step 1: Check transition syntax order

   The correct syntax is transition: property duration;. Here, duration comes before property, which is wrong.

2. Step 2: Verify if width can be transitioned

   Width is a valid property for transition, and the hover selector is correct, so no errors there.

3. Final Answer:

   The transition duration and property order is incorrect. -> Option B

4. Quick Check:

   Property then duration order needed [OK]

Hint: Transition syntax: property first, then duration [OK]

Common Mistakes:

• Swapping duration and property order
• Thinking width can't transition
• Misreading hover selector syntax

5. You want to smoothly change both color and background-color on a button hover, but only color changes smoothly. Which CSS fixes this?

hard

A. transition: color 0.5s, background-color 0.5s;

B. transition: color 0.5s background-color 0.5s;

C. transition: all;

D. transition: background-color 0.5s;

Solution

1. Step 1: Understand multiple property transitions

   To transition multiple properties, list them separated by commas with their durations.

2. Step 2: Analyze options

   transition: color 0.5s, background-color 0.5s; correctly lists both properties with durations separated by commas. transition: color 0.5s background-color 0.5s; misses commas, causing syntax error. transition: all; lacks duration (defaults to 0s, no smooth transition). transition: background-color 0.5s; only transitions background-color.

3. Final Answer:

   transition: color 0.5s, background-color 0.5s; -> Option A

4. Quick Check:

   Use commas to separate multiple transitions [OK]

Hint: Separate multiple transitions with commas [OK]

Common Mistakes:

• Omitting commas between properties
• Using 'all' without duration
• Listing properties without durations