`@view-transition` CSS at-rule

The @view-transition CSS at-rule is used to opt in the current and destination documents to undergo a view transition, in the case of a cross-document navigation.

For a cross-document view transition to work, the current and destination documents of the navigation need to be on the same origin.

Syntax

@view-transition {
  navigation: auto | none;
  types: none | <custom-ident>#;
}

Descriptors

• navigation

  • : A keyword specifying the effect this at-rule will have on the document’s view transition behavior. Possible values are:
    • auto
      • : The document will undergo a view transition when taking part in a navigation, provided the navigation is same-origin, without cross-origin redirects, and its navigationType is traverse, push, or replace. In the case of push or replace, the navigation must be initiated by a user interacting with the page content, not by a browser UI feature.
    • none
      • : The document will not undergo a view transition.

• types

  • : Specifies the view transition types to set on the active view transition for the current and destination documents. Possible values are:
    • <custom-ident>+
      • : One or more space-separated <custom-ident> values representing the types to set.
    • none
      • : No types are set.

Formal syntax

Examples

Transitioning page view

The following code snippets show key concepts used in a page transition demo. The demo uses cross-document view-transitions; a half second transition that occurs when navigating between two pages of a site. For the full demo, see the View transitions multi-page app demo.

The @view-transition at-rule is specified in the CSS for both your current and destination documents of a navigation to opt them both in to the view transition:

@view-transition {
  navigation: auto;
}

In addition to the @view-transition at-rule, we use the @keyframes at-rule to define two keyframe animations and use the animation shorthand property to apply those keyframe animations to the elements in the outbound (::view-transition-old()) and inbound (::view-transition-new()) pages that we want to animate.

/* Create a custom animation */
@keyframes move-out {
  from {
    transform: translateY(0%);
  }

  to {
    transform: translateY(-100%);
  }
}

@keyframes move-in {
  from {
    transform: translateY(100%);
  }

  to {
    transform: translateY(0%);
  }
}

/* Apply the custom animation to the old and new page states */
::view-transition-old(root) {
  animation: 0.4s ease-in both move-out;
}

::view-transition-new(root) {
  animation: 0.4s ease-in both move-in;
}

See this transitions multi-page app demo live.

Using view transition types

Our MPA transition types example (source code) demonstrates how to use types via @view-transition:

@view-transition {
  navigation: auto;
  types: slide;
}

See Using types with cross-document view transitions via @view-transition for a walkthrough of the referenced example.

Specifications

Browser compatibility

See also

• ::view-transition
• ::view-transition-new()
• ::view-transition-old()
• ::view-transition-group()
• ::view-transition-image-pair()
• View Transition API
• Using view transition types
• CSS at-rules
• CSS at-rule functions