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<!DOCTYPE html>
<html>
<title>View transitions: Dynamic stylesheet sets correct animations</title>
<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
<link rel="help" href="https://drafts.csswg.org/css-view-transitions/#setup-transition-pseudo-elements-algorithm">
<style>
:root { view-transition-name: none; }
#target {
view-transition-name: target;
background: red;
width: 100px;
height: 100px;
}
html::view-transition-group(*) {
animation-timing-function: steps(2, start);
animation-play-state: paused;
}
html::view-transition-old(*),
html::view-transition-new(*) {
animation-play-state: paused;
}
</style>
<div id="target"></div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(async () => {
let vt = document.startViewTransition(() => {
target.style.backgroundColor = "green";
});
await vt.ready;
assert_equals(
getComputedStyle(document.documentElement, "::view-transition-group(target)").animationName,
"-ua-view-transition-group-anim-target",
"Animation on group when there are 2 snapshots"
);
assert_equals(
getComputedStyle(document.documentElement, "::view-transition-old(target)").animationName,
"-ua-view-transition-fade-out, -ua-mix-blend-mode-plus-lighter",
"Two animations when there are 2 snapshots"
);
assert_equals(
getComputedStyle(document.documentElement, "::view-transition-new(target)").animationName,
"-ua-view-transition-fade-in, -ua-mix-blend-mode-plus-lighter",
"Two animations when there are 2 snapshots"
);
await vt.skipTransition();
}, "Both old and new snapshots");
promise_test(async () => {
let vt = await document.startViewTransition(() => {
target.remove();
});
await vt.ready;
assert_equals(
getComputedStyle(document.documentElement, "::view-transition-group(target)").animationName,
"none",
"No animation on group when one snapshot is missing"
);
assert_equals(
getComputedStyle(document.documentElement, "::view-transition-old(target)").animationName,
"-ua-view-transition-fade-out",
"Only one animation for old snapshot when new snapshot is missing"
);
assert_equals(
getComputedStyle(document.documentElement, "::view-transition-new(target)").animationName,
"none",
"No animation since the snapshot is not generated"
);
await vt.skipTransition();
}, "Only old snapshot");
promise_test(async () => {
let vt = await document.startViewTransition(() => {
const div = document.createElement("div");
div.id = "target";
document.body.append(div);
});
await vt.ready;
assert_equals(
getComputedStyle(document.documentElement, "::view-transition-group(target)").animationName,
"none",
"No animation on group when one snapshot is missing"
);
assert_equals(
getComputedStyle(document.documentElement, "::view-transition-old(target)").animationName,
"none",
"No animation since the snapshot is not generated"
);
assert_equals(
getComputedStyle(document.documentElement, "::view-transition-new(target)").animationName,
"-ua-view-transition-fade-in",
"Only one animation for new snapshot when old snapshot is missing"
);
await vt.skipTransition();
}, "Only new snapshot");
</script>
</body>
</html>
|
