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<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: new element is modified while offscren and brought onscreen using pseudo</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:khushalsagar@chromium.org">
<link rel="match" href="offscreen-element-modified-before-coming-onscreen-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
#target {
width: 100px;
height: 100px;
view-transition-name: target;
position: fixed;
background: green;
left: 0;
top: 200vh;
}
.hidden {
width: 10px;
height: 10px;
background: grey;
view-transition-name: hidden;
}
.onscreen::view-transition-group(target) {
transform: unset;
position: fixed;
top: 0;
left: 0;
animation: unset;
}
html::view-transition-group(hidden) { animation-duration: 300s; }
html::view-transition-image-pair(hidden) { animation: unset; opacity: 0; }
html::view-transition-old(target) { animation: unset; opacity: 0; }
html::view-transition-new(target) { animation: unset; opacity: 1; }
</style>
<div id=target class=target>
<div id=hidden class=hidden></div>
<script>
failIfNot(document.startViewTransition, "Missing document.startViewTransition");
function bringOnscreenAndScreenshot() {
document.documentElement.classList.add("onscreen");
requestAnimationFrame(() => requestAnimationFrame(() =>
requestAnimationFrame(() => requestAnimationFrame(takeScreenshot))
));
}
async function runTest() {
// Start the transition while the element is offscreen.
let transition = document.startViewTransition();
await transition.ready;
// Change the element's color while its still offscreen.
target.style.background = "blue";
// Bring the element onscreen and ensure the color change is presented.
requestAnimationFrame(() => requestAnimationFrame(() =>
requestAnimationFrame(() => requestAnimationFrame(
bringOnscreenAndScreenshot))
));
}
onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
</script>
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