ViewTransition
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The ViewTransition
interface of the View Transition API represents an active view transition, and provides functionality to react to the transition reaching different states (e.g. ready to run the animation, or animation finished) or skip the transition altogether.
This object type is made available in the following ways:
- In the case of same-document (SPA) transitions, it is returned by the
document.startViewTransition()
method. - In the case of cross-document (MPA) transitions, it is made available:
- In the outgoing page via the
pageswap
event object'sPageSwapEvent.viewTransition
property. - In the inbound page via the
pagereveal
event object'sPageRevealEvent.viewTransition
property.
- In the outgoing page via the
When a view transition is triggered by a startViewTransition()
call (or a page navigation in the case of MPA transitions), a sequence of steps is followed as explained in The view transition process. This also explains when the different promises fulfill.
Instance properties
ViewTransition.finished
Read only-
A
Promise
that fulfills once the transition animation is finished, and the new page view is visible and interactive to the user. ViewTransition.ready
Read only-
A
Promise
that fulfills once the pseudo-element tree is created and the transition animation is about to start. ViewTransition.updateCallbackDone
Read only-
A
Promise
that fulfills when the promise returned by thedocument.startViewTransition()
method's callback fulfills.
Instance methods
skipTransition()
-
Skips the animation part of the view transition, but doesn't skip running the
document.startViewTransition()
callback that updates the DOM.
Examples
In the following SPA example, the ViewTransition.ready
promise is used to trigger a custom circular reveal view transition emanating from the position of the user's cursor on click, with animation provided by the Web Animations API.
// Store the last click event
let lastClick;
addEventListener("click", (event) => (lastClick = event));
function spaNavigate(data) {
// Fallback for browsers that don't support this API:
if (!document.startViewTransition) {
updateTheDOMSomehow(data);
return;
}
// Get the click position, or fallback to the middle of the screen
const x = lastClick?.clientX ?? innerWidth / 2;
const y = lastClick?.clientY ?? innerHeight / 2;
// Get the distance to the furthest corner
const endRadius = Math.hypot(
Math.max(x, innerWidth - x),
Math.max(y, innerHeight - y),
);
// Create a transition:
const transition = document.startViewTransition(() => {
updateTheDOMSomehow(data);
});
// Wait for the pseudo-elements to be created:
transition.ready.then(() => {
// Animate the root's new view
document.documentElement.animate(
{
clipPath: [
`circle(0 at ${x}px ${y}px)`,
`circle(${endRadius}px at ${x}px ${y}px)`,
],
},
{
duration: 500,
easing: "ease-in",
// Specify which pseudo-element to animate
pseudoElement: "::view-transition-new(root)",
},
);
});
}
This animation also requires the following CSS, to turn off the default CSS animation and stop the old and new view states from blending in any way (the new state "wipes" right over the top of the old state, rather than transitioning in):
::view-transition-image-pair(root) {
isolation: auto;
}
::view-transition-old(root),
::view-transition-new(root) {
animation: none;
mix-blend-mode: normal;
display: block;
}
Specifications
Specification |
---|
CSS View Transitions Module Level 1 # viewtransition |
Browser compatibility
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