Flash cards
Review the key moves
What is the main idea behind CSS Transitions?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
___: 100px;Put the learning moves in the order that makes the concept easiest to apply.
CSS transitions allows you to change property values smoothly, over a given duration.
Mouse over the element below to see a CSS transition effect:
The CSS transition Property
To create a transition effect, you must specify the CSS property you want to add a transition to, and the duration of the transition.
The CSS transition property is a shorthand property for:
- transition-property
- transition-duration
- transition-timing-function
- transition-delay
CSS Transition Example
The following example shows a 100px * 100px <div> element. The <div> element has specified a transition effect for the width property, with a duration of 2 seconds:
Example
div {
width: 100px;
height: 100px;
background-color: red;
transition: width 2s;
}How to Trigger the Transition
The transition is triggered when there is a change in the element's properties. This often happens within pseudo-classes (:hover, :active, :focus, or :checked).
So, from the code above, the transition effect will start when the width property changes value.
Now, we add a div:hover class that specifies a new value for the width property when a user mouses over the <div> element:
Example
div:hover {
width: 300px;
}Live preview
Notice that when the cursor mouses out of the element, it will gradually change back to its original style.
Change Multiple Property Values
You can change multiple properties by separating them by commas.
The following example adds a transition effect for the width, height, and background-color properties, with a duration of 2 seconds for the width, 4 seconds for the height, and 3 seconds for the background-color:
Example
div {
transition: width 2s, height 4s, background-color 3s;
}Live preview
CSS Transition Properties
The following table lists all the CSS transition properties:
| Property | Description |
|---|---|
| transition | A shorthand property for setting the four transition properties into a single property |
| transition-delay | Specifies a delay (in seconds) for the transition effect |
| transition-duration | Specifies how many seconds or milliseconds a transition effect takes to complete |
| transition-property | Specifies the name of the CSS property the transition effect is for |
| transition-timing-function | Specifies the speed curve of the transition effect |