<!DOCTYPE html>
<title>View transitions: event pseudo name</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
:root { view-transition-name: none; }
#first {
background: blue;
width: 100px;
height: 100px;
view-transition-name: shared;
}
html::view-transition-group(*),
html::view-transition-image-pair(*),
html::view-transition-new(*),
html::view-transition-old(*) {
animation-duration: 600s;
}
@keyframes fade-in {
from { opacity: 0; }
}
html::view-transition-image-pair(*) {
animation: fade-in 600s both;
}
</style>
<div id=first></div>
<script>
async_test(t => {
assert_implements(document.startViewTransition, "Missing document.startViewTransition");
let groupAnimationCount = 0;
let oldAnimationCount = 0;
let newAnimationCount = 0;
let wrapperAnimationCount = 0;
document.documentElement.addEventListener("animationstart", (e) => {
let pseudo = e.pseudoElement;
if (pseudo == "::view-transition-group(shared)") {
groupAnimationCount++;
} else if (pseudo == "::view-transition-new(shared)") {
newAnimationCount++;
} else if (pseudo == "::view-transition-old(shared)") {
oldAnimationCount++;
} else if (pseudo = "::view-transition-image-pair(shared)") {
wrapperAnimationCount++;
}
let total =
groupAnimationCount + oldAnimationCount + newAnimationCount + wrapperAnimationCount;
// Old/new images have 2 animations : opacity and mix-blend-mode.
if (total == 6) {
t.step(() => assert_equals(groupAnimationCount, 1));
t.step(() => assert_equals(wrapperAnimationCount, 1));
t.step(() => assert_equals(oldAnimationCount, 2));
t.step(() => assert_equals(newAnimationCount, 2));
t.done();
}
});
document.startViewTransition();
}, "verifies pseudo name includes a tag");
</script>
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