The CSS transitions module specifies functionality for creating gradual transitions between different CSS property values. The behavior of these transitions can be controlled by specifying their easing function, duration, and other values.

Normally, when the value of a CSS property changes, the result of the change from the old value to the new value is immediate. The CSS transitions module enables controlling a progression from the old property state to the new state over a specified period of time. It also provides event handlers to allow code to be run in response to different stages of a transition being reached.

In certain cases, there is no originating "from" value for a transition. For example, if an element gets added to the DOM, the styles defined are for the "to" state. This module provides the @starting-style at-rule, which enables defining starting styles for such cases. The module also defines how discrete property values should be transitioned, such as transitioning the discretely animated display property from the none value to a displayed value.

Reference

Properties

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

At rules

• @starting-style

Interfaces

• CSSStartingStyleRule
• CSSTransition
  • transitionProperty property
• TransitionEvent
  • TransitionEvent() constructor
  • TransitionEvent.propertyName property
  • TransitionEvent.elapsedTime property
  • TransitionEvent.pseudoElement property
  • transitioncancel event
  • transitionend event
  • transitionrun event
  • transitionstart event

Guides

Using CSS transitions

Step-by-step tutorial explaining how to create transitions using CSS. This article describes each relevant CSS property and explains how they interact with each other.

Animating display

Transitioning to and from the none value of the discretely animated display property.

Transitioning a popover and transitioning a <dialog>

Examples of transitioning from @starting-style to final :popover-open and :open pseudo-class styles.

Related concepts

• interpolate-size property

• calc-size() function

• Intrinsic size glossary term

• CSS easing functions module

  • <easing-function> data-type

• CSS animations module.

  • animation shorthand
  • animation-delay
  • animation-direction
  • animation-duration
  • animation-fill-mode
  • animation-iteration-count
  • animation-name
  • animation-play-state
  • animation-timing-function

• CSS transforms module.

  • transform
  • transform-box
  • transform-origin
  • transform-style

• CSS scroll snap module

  • scroll-snap-type
  • scroll-padding
  • scroll-snap-align
  • scroll-margin
  • scroll-snap-stop

Specifications

See also

• opacity
• visibility
• ViewTransition interface
• PageTransitionEvent interface