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<!DOCTYPE html>
<html class="foo">
<title>View transitions: ensure :only-child is supported on view-transition-group</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<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-group(root) {
background-color: blue;
}
::view-transition-group(target) {
background-color: blue;
}
::view-transition-group(*) {
color: blue;
}
::view-transition-group(root):only-child {
background-color: red;
}
::view-transition-group(target):only-child {
background-color: red;
}
::view-transition-group(*):only-child {
color: red;
}
</style>
<div id="target"></div>
<div id="target2"></div>
<script>
function resetState() {
if (window.transition)
window.transition.skipTransition();
document.documentElement.style.viewTransitionName = "";
target.style.viewTransitionName = "";
target2.style.viewTransitionName = "";
}
promise_test((t) => {
assert_implements(document.startViewTransition, "Missing document.startViewTransition");
t.add_cleanup(resetState);
return new Promise(async (resolve, reject) => {
window.transition = document.startViewTransition();
window.transition.ready.then(() => {
let style = getComputedStyle(document.documentElement, "::view-transition-group(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 match because ::view-transition-group is generated for root element only");
promise_test((t) => {
assert_implements(document.startViewTransition, "Missing document.startViewTransition");
t.add_cleanup(resetState);
return new Promise(async (resolve, reject) => {
target.style.viewTransitionName = "target";
window.transition = document.startViewTransition();
window.transition.ready.then(() => {
let style = getComputedStyle(document.documentElement, "::view-transition-group(root)");
if (style.backgroundColor == "rgb(0, 0, 255)" && style.color == "rgb(0, 0, 255)")
resolve();
else
reject(style.backgroundColor + " and " + style.color);
});
});
}, ":only-child should not match because ::view-transition-group is generated for multiple elements");
promise_test((t) => {
assert_implements(document.startViewTransition, "Missing document.startViewTransition");
t.add_cleanup(resetState);
return new Promise(async (resolve, reject) => {
document.documentElement.style.viewTransitionName = "none";
target.style.viewTransitionName = "target";
window.transition = document.startViewTransition();
window.transition.ready.then(() => {
let style = getComputedStyle(document.documentElement, "::view-transition-group(target)");
if (style.backgroundColor == "rgb(255, 0, 0)" && style.color == "rgb(255, 0, 0)")
resolve();
else
reject(style.backgroundColor + " and " + style.color);
});
});
}, ":only-child should match because ::view-transition-group is generated for sub element only");
promise_test((t) => {
assert_implements(document.startViewTransition, "Missing document.startViewTransition");
t.add_cleanup(resetState);
return new Promise(async (resolve, reject) => {
document.documentElement.style.viewTransitionName = "none";
target.style.viewTransitionName = "target";
target2.style.viewTransitionName = "target2";
window.transition = document.startViewTransition();
window.transition.ready.then(() => {
let style = getComputedStyle(document.documentElement, "::view-transition-group(target)");
if (style.backgroundColor == "rgb(0, 0, 255)" && style.color == "rgb(0, 0, 255)")
resolve();
else
reject(style.backgroundColor + " and " + style.color);
});
});
}, ":only-child should not match because ::view-transition-group is generated for multiple sub elements");
</script>
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