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content-with-transparent-background.html
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<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: element with transparent background</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="content-with-transparent-background-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
.target {
width: 100px;
height: 100px;
view-transition-name: target;
position: fixed;
top: 25px;
left: 25px;
background: rgba(0,0,0,0);
}
.embedded {
width: 25%;
height: 50%;
position: absolute;
top: 0px;
will-change: opacity;
}
#one{
left: 25%;
background: lightblue;
}
#two {
left: 50%;
background: lightgreen;
}
.hidden {
width: 10px;
height: 10px;
background: grey;
view-transition-name: hidden;
}
html::view-transition-group(hidden) { animation-duration: 300s; }
html::view-transition-image-pair(hidden) { animation: unset; opacity: 0; }
html::view-transition-group(target) { animation: unset; }
html::view-transition-old(target) { animation: unset; opacity: 1; }
html::view-transition-new(target) { animation: unset; opacity: 0; }
</style>
<div class="target">
<div class="embedded" id="one"></div>
<div class="embedded" id="two"></div>
</div>
<div id=hidden class=hidden></div>
<script>
failIfNot(document.startViewTransition, "Missing document.startViewTransition");
async function runTest() {
document.startViewTransition().ready.then(requestAnimationFrame(takeScreenshot));
}
onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
</script>