CSS Transition Generator

Configure CSS transitions with property, duration, timing function, and delay with live hover preview.

Tested tool guide Tested browser tools Checked August 16, 2026

What CSS Transition Generator does, with a checked example

CSS Transition Generator turns four choices into a transition declaration: the property to animate, how long the change lasts, how its pace varies, and how long it waits before starting. A live hover sample shows the resulting motion so timing choices can be compared visually. The important limitation is that a transition does not create a hover-state change. The element still needs distinct starting and ending styles, and the chosen property must support interpolation between them.

Worked example

A concrete input and expected output from the current implementation.

Input

property: opacity
duration: 300ms
timing function: ease-in-out
delay: 100ms

Expected output

transition: opacity 300ms ease-in-out 100ms;

After the triggering style change, opacity waits 100 milliseconds and then transitions for 300 milliseconds. If the target state remains active, it reaches the ending value 400 milliseconds after the trigger.

How the result is produced

Building the shorthand

Set the target property, duration, timing function, and delay. The generated shorthand places the first time value in the duration slot and the second in the delay slot. Duration is the active interpolation period; delay is the wait before that period begins. The live hover sample lets you feel the combined settings before copying the declaration.

Applying the result

Place the generated declaration on the element whose computed style will change. Define the original value in its normal rule and the destination value in a rule such as :hover or :focus-visible. When that state changes, the browser attempts to interpolate the selected property according to the generated timing function, duration, and delay.

Good uses

Tune an opacity fade for a button while comparing easing choices and start delays.
Generate a background-color transition for a link, card, or navigation item with a hover state.
Target transform so a scale or movement effect transitions without broadly animating every changed property.

Limits and checks

The preview demonstrates timing, but it does not supply the destination styles required in the actual stylesheet.
Some CSS properties cannot be interpolated continuously, so changing them may produce a jump instead of visible motion.
Selecting all can transition unrelated property changes; name a specific property when only one effect should animate.

Common questions

Does the generated declaration create the hover effect by itself?

No. It controls how a qualifying property change proceeds, but it does not define the changed value. Add a base rule and a state rule, such as opacity: 1 on the element and opacity: 0.6 on :hover. The transition declaration then controls the movement between those two computed values.

Why does the property change immediately instead of transitioning?

The property may not be animatable, the starting value may be missing, or the transition declaration may be attached to the wrong element. Also check that duration is greater than zero and that the property named in the declaration is the one actually changing. A delay postpones the transition but does not make a discrete property interpolable.

References and verification

The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.