Transition property in CSS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the CSS transition property do?

It makes changes to CSS properties happen smoothly over time instead of instantly, creating an animation effect.

beginner

Name the four parts of the transition shorthand property.

The four parts are: property (which CSS property to animate), duration (how long it takes), timing-function (speed curve), and delay (wait time before starting).

intermediate

What is the default value of the transition-timing-function?

The default is ease, which starts slow, speeds up, then slows down at the end.

beginner

How do you make a background color change smoothly over 0.5 seconds using transition?

Use transition: background-color 0.5s; on the element. When the background color changes, it will animate over half a second.

intermediate

Can you transition multiple CSS properties at once? How?

Yes, by listing them separated by commas, like transition: width 1s, height 1s; to animate width and height together.

Which CSS property controls how long a transition animation lasts?

A transition-timing-function

B transition-delay

C transition-duration

D transition-property

transition-duration sets the length of time the transition takes to complete.

What is the default timing function for CSS transitions?

A ease

B ease-in

C linear

D ease-out

The default transition-timing-function is ease, which starts slow, speeds up, then slows down.

How do you delay a transition start by 2 seconds?

A transition-delay: 2s;

B transition-duration: 2s;

C transition-start: 2s;

D transition-wait: 2s;

transition-delay sets how long to wait before the transition begins.

Which value for transition-property makes all properties transition?

A every

B all

C auto

D none

Using all means every animatable property will transition.

What happens if you set transition: none; on an element?

A Transitions happen instantly.

B Transitions use default settings.

C Transitions last forever.

D No transitions will occur.

none disables all transitions on the element.

Explain how the CSS transition property works and why it is useful.

Think about how changes happen on a webpage and how transition makes them look nicer.

Describe how to create a smooth color change on a button when hovered using the transition property.

Consider what CSS properties you change on hover and how to animate that change.

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