:active-view-transition

Syntax

css

:root:active-view-transition ... { /* ... */ }

Examples

Styling an active view transition

This example extends on the same-document view transition example on the startViewTransition page.

html

<main> <section class="color"> <h2>Color is changing!</h2> </section> <button id="change-color">Change Color</button> </main>

A <h2> element initially has a display: none style, and this is overwritten using the :active-view-transition pseudo-class setting the <h2> style to display: block. The button is hidden using visibility: hidden, when the view transition is in progress:

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

css

h2 { display: none; color: white; } :root:active-view-transition h2 { display: block; } :root:active-view-transition button { visibility: hidden; }

const colors = ["darkred", "darkslateblue", "darkgreen"]; const colBlock = document.querySelector(".color"); let count = 0; const updateColour = () => { colBlock.style = `--bg: ${colors[count]}`; count = count !== colors.length - 1 ? ++count : 0; }; const changeColor = () => { if (!document.startViewTransition) { updateColour(); return; } const transition = document.startViewTransition(() => { updateColour(); }); }; const changeColorButton = document.querySelector("#change-color"); changeColorButton.addEventListener("click", changeColor); changeColorButton.addEventListener("keypress", changeColor);