Document: startViewTransition() method

Syntax

startViewTransition()
startViewTransition(updateCallback)
startViewTransition(options)

Parameters

updateCallback Optional

An optional callback function typically invoked to update the DOM during the SPA view transition process, which returns a Promise. The callback is invoked once the API has taken a snapshot of the current page. When the promise returned by the callback fulfills, the view transition begins in the next frame. If the promise returned by the callback rejects, the transition is abandoned.

options Optional

An object containing options to configure the view transition. It can include the following properties:

update Optional

The same updateCallback function described above. Defaults to null.

types Optional

An array of strings representing the types applied to the view transition. View transition types enable selective application of CSS styles or JavaScript logic based on the type of transition occurring. Defaults to an empty sequence.

Return value

A ViewTransition object instance.

Examples

See View transition API > Examples for a list of full examples.

Basic usage

In this same-document view transition, we check if the browser supports view transitions. If there's no support, we set the background color using a fallback method which is applied immediately. Otherwise, we can safely call document.startViewTransition() with animation rules that we define in CSS.

<main>
  <section></section>
  <button id="change-color">Change color</button>
</main>

We are setting the animation-duration to 2 seconds using the ::view-transition-group pseudo-element.

html {
  --bg: indigo;
}
main {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
section {
  background-color: var(--bg);
  height: 60px;
  border-radius: 5px;
}
::view-transition-group(root) {
  animation-duration: 2s;
}

const colors = ["darkred", "darkslateblue", "darkgreen"];
const colBlock = document.querySelector("section");
let count = 0;
const updateColor = () => {
  colBlock.style = `--bg: ${colors[count]}`;
  count = count !== colors.length - 1 ? ++count : 0;
};
const changeColor = () => {
  // Fallback for browsers that don't support View Transitions:
  if (!document.startViewTransition) {
    updateColor();
    return;
  }

  // With View Transitions:
  const transition = document.startViewTransition(() => {
    updateColor();
  });
};
const changeColorButton = document.querySelector("#change-color");
changeColorButton.addEventListener("click", changeColor);
changeColorButton.addEventListener("keypress", changeColor);

If view transitions are supported, clicking the button will transition the color from one to another over 2 seconds. Otherwise, the background color is set using a fallback method, without any animation.

Specifications

Browser compatibility

See also

• Document.activeViewTransition
• :active-view-transition pseudo-class
• :active-view-transition-type() pseudo-class
• View Transition API
• Using the View Transition API
• Using view transition types
• Smooth transitions with the View Transition API