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<!DOCTYPE html>
<html class="reftest-wait foo">
<title>View transitions: ensure :only-child is supported on view-transition-image-pair</title>
<link rel="help" href="https://github.com/WICG/view-transitions">
<link rel="author" href="mailto:khushalsagar@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
::view-transition {
background-color: black;
}
html:only-child {
background-color: black;
}
:root:only-child {
background-color: black;
}
:only-child {
background-color: black;
}
.foo:only-child {
background-color: black;
}
::view-transition-image-pair(root):only-child {
background-color: red;
}
::view-transition-image-pair(*):only-child {
color: red;
}
</style>
<script>
promise_test(() => {
assert_implements(document.startViewTransition, "Missing document.startViewTransition");
return new Promise(async (resolve, reject) => {
let transition = document.startViewTransition();
transition.ready.then(() => {
let style = getComputedStyle(
document.documentElement, ":view-transition-image-pair(root)");
if (style.backgroundColor == "rgb(255, 0, 0)" && style.color == "rgb(255, 0, 0)")
resolve();
else
reject(style.backgroundColor + " and " + style.color);
});
});
}, ":only-child should always match for ::view-transition-image-pair");
</script>
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