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Use a CSS transition to make a property change gradual: set the transition on the element’s normal rule, then change the property in a state such as :hover, :focus-visible, or a JavaScript-controlled class. The transition animates between the old and new values; it does not trigger the change itself.
Build a basic CSS transition
This button changes color and moves slightly when hovered or reached with a keyboard. The base rule lists the properties to animate and how they should change; the state rule supplies their destination values.
.button {
background-color: #2457c5;
transform: translateY(0);
transition: background-color 180ms ease, transform 180ms ease;
}
.button:hover,
.button:focus-visible {
background-color: #17449f;
transform: translateY(-2px);
}The duration and easing here are illustrative, not a universal performance recommendation. Choose them to suit the interface and check the effect in context.
What the transition shorthand controls
The shorthand is transition: <property> <duration> <timing-function> <delay> <behavior>;. The first four components are the familiar controls; transition-behavior is an additional, newer control for discrete changes.
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| Control | What it does | Example |
|---|---|---|
transition-property |
Selects which changing CSS properties to animate. Listing properties explicitly makes the intended motion clear. all broadly selects changing properties. |
opacity, transform |
transition-duration |
Sets how long the transition takes. Its initial value is 0s, so a visible transition normally needs a nonzero duration. |
180ms |
transition-timing-function |
Controls how progress is distributed across the duration. | ease or linear |
transition-delay |
Sets how long to wait after the value changes before the transition starts. | 100ms |
transition-behavior |
Controls whether discrete properties can transition, using values such as allow-discrete. |
allow-discrete |
For example, transition: opacity 200ms ease 50ms; selects opacity, sets a 200 ms duration, uses easing, and waits 50 ms before starting. See MDN’s references for the transition shorthand, property selection, duration, timing functions, and delay.
Choose properties deliberately
A transition only affects properties included in its property list. Naming the properties you intend to animate is easier to understand and maintain than using all, which applies broadly to changing properties. If you use a shorthand property such as background, animatable longhand sub-properties may also be included.
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Match comma-separated entries
You can provide comma-separated transition entries for different properties and timings, as in the button example. When values are provided as lists, duration lists repeat or truncate to match the property list. Check that each property has the intended timing rather than assuming list items pair up in some other way.
Trigger transitions with state changes
A transition needs a change in the property value. Common triggers include pseudo-classes such as :hover and :focus, a class added or removed by JavaScript, or an element’s insertion into the page. The trigger provides the new value; the transition declaration interpolates between it and the previous value.
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Keep the transition declaration on the element’s base rule so it can apply when the state changes in either direction. Put the changed values in the alternate state or class rule. A CSS transition does not, by itself, create a state change or repeatedly animate without one.
Respect reduced-motion preferences
Motion can help explain a state change or relationship, but it can also be uncomfortable or harmful for some people, including people with vestibular disorders, epilepsy, migraine, or cognitive concerns. Offer a reduced-motion experience when a user requests one. This simple pattern removes the button transition for those users:
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@media (prefers-reduced-motion: reduce) {
.button {
transition: none;
}
}This is one implementation pattern, not a complete accessibility solution for every kind of motion. Consider whether an interface also needs a mechanism to pause or disable motion.
For more detail on easing and motion considerations, consult MDN’s timing-function reference.
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Handle entry, exit, and discrete changes
Ordinary transitions interpolate between values. Some changes are discrete rather than a smooth progression through intermediate values. For elements that enter without an originating style, @starting-style can define the starting appearance. For discrete properties, transition-behavior: allow-discrete can enable transition behavior where supported.
.panel {
opacity: 1;
transition: opacity 200ms ease, display 200ms allow-discrete;
}
@starting-style {
.panel {
opacity: 0;
}
}This illustrates the newer syntax; test it in the browsers your audience uses. MDN identifies transition-behavior as Baseline 2024, but older browsers may not support it. The core transition controls are widely available and generally established across browsers since September 2015. Check MDN’s current compatibility tables for the specific feature and browser versions you need: transition-behavior and CSS transitions.
Troubleshoot a transition that does not appear
- It changes instantly: Confirm that the duration is nonzero. The default is
0s. - Nothing changes: Verify that the relevant property value actually changes between the base and alternate states.
- Only some properties animate: Make sure every intended property is included in
transition-propertyor the shorthand. - The destination value seems ignored: Check whether another declaration overrides the alternate-state rule.
- The wrong timing is used: Review comma-separated property and timing lists; duration values repeat or truncate to match the property list.
- An entry or discrete change fails in an older browser: Check support for
@starting-styleortransition-behaviorand provide an acceptable non-transitioning result.
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Does CSS transition create the state change?
No. A pseudo-class, class change, or other state change sets the new value; the transition animates between the old and new values.
Are CSS transitions supported in modern browsers?
MDN describes the core transition properties as widely available and generally established since September 2015. Newer discrete-transition behavior may be missing from older browsers; check MDN compatibility tables for your target versions.
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