transition

The transition CSS property is a shorthand property for transition-property, transition-duration, transition-timing-function, and transition-delay.

Transitions enable you to define the transition between two states of an element. Different states may be defined using pseudo-classes like :hover or :active or dynamically set using JavaScript.

This property is a shorthand for the following CSS properties:

• transition-delay
• transition-duration
• transition-property
• transition-timing-function

/* Apply to 1 property */
/* property name | duration */
transition: margin-right 4s;

/* property name | duration | delay */
transition: margin-right 4s 1s;

/* property name | duration | easing function */
transition: margin-right 4s ease-in-out;

/* property name | duration | easing function | delay */
transition: margin-right 4s ease-in-out 1s;

/* Apply to 2 properties */
transition: margin-right 4s, color 1s;

/* Apply to all changed properties */
transition: all 0.5s ease-out;

/* Global values */
transition: inherit;
transition: initial;
transition: revert;
transition: unset;

The transition property is specified as one or more single-property transitions, separated by commas.

Each single-property transition describes the transition that should be applied to a single property (or the special values all and none). It includes:

• zero or one value representing the property to which the transition should apply. This may be any one of:
  • the keyword none
  • the keyword all
  • a <custom-ident> naming a CSS property.
• zero or one <easing-function> value representing the easing function to use
• zero, one, or two <time> values. The first value that can be parsed as a time is assigned to the transition-duration, and the second value that can be parsed as a time is assigned to transition-delay.

See how things are handled when lists of property values aren't the same length. In short, extra transition descriptions beyond the number of properties actually being animated are ignored.

<single-transition>#
where 
<single-transition> = [ none | <single-transition-property> ] || <time> || <easing-function> || <time>
where 
<single-transition-property> = all | <custom-ident>
<easing-function> = linear | <cubic-bezier-timing-function> | <step-timing-function>
where 
<cubic-bezier-timing-function> = ease | ease-in | ease-out | ease-in-out | cubic-bezier(<number [0,1]>, <number>, <number [0,1]>, <number>)
<step-timing-function> = step-start | step-end | steps(<integer>[, <step-position>]?)
where 
<step-position> = jump-start | jump-end | jump-none | jump-both | start | end

This example performs a four-second font size transition with a one-second delay when the user hovers over the element.

HTML

<a class="target">Hover over me</a>

CSS

.target {
  font-size: 14px;
  transition: font-size 4s 1s;
}

.target:hover {
  font-size: 36px;
}

There are several more examples of CSS transitions included in the Using CSS transitions article.

• Using CSS transitions
• TransitionEvent