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<!DOCTYPE html>
<html>
<title>View transitions: check pseudo element's default styles with clean style</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:vmpstr@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<style>
#target {
width: 100px;
height: 100px;
view-transition-name: target;
mix-blend-mode: multiply;
}
::view-transition-image-pair(target) {
position: fixed;
}
</style>
<div id=target></div>
<script>
promise_test(async () => {
assert_implements(document.startViewTransition, "Missing document.startViewTransition");
await waitForCompositorReady();
let transition = document.startViewTransition(() => {
// Ensure our style & layout are clean.
document.documentElement.getBoundingClientRect();
assert_equals(getComputedStyle(document.documentElement, "::view-transition").position, "fixed", "::view-transition");
assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").mixBlendMode, "normal", "container(target)");
});
// When transition is ready, the activation of the view transition should be done, so
// we have updated the pseudo-element styles.
await transition.ready;
// Ensure our style & layout are clean.
document.documentElement.getBoundingClientRect();
assert_equals(getComputedStyle(document.documentElement, "::view-transition").position, "fixed", "::view-transition");
assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").mixBlendMode, "multiply", "container(target)");
await transition.finished;
}, "properties of pseudo elements in update callback");
</script>
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