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<!doctype html>
<title>container-name invalidation</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#container-name">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
div {
color: black;
}
#outer {
container-name: c1;
container-type: inline-size;
width: 300px;
}
#inner {
container-name: c2;
container-type: inline-size;
width: 200px;
}
#intermediate {
width: 250px;
}
@container c1 (width: 250px) {
#child {
color: green;
}
}
</style>
<div id=outer>
<div id=intermediate>
<div id=inner>
<div id=child>Test</div>
</div>
</div>
</div>
<script>
setup(() => assert_implements_container_queries());
test(function(t) {
t.add_cleanup(() => { outer.style = ''; });
assert_equals(getComputedStyle(child).color, 'rgb(0, 0, 0)');
outer.style.width = '250px';
assert_equals(getComputedStyle(child).color, 'rgb(0, 128, 0)');
outer.style.width = '251px';
assert_equals(getComputedStyle(child).color, 'rgb(0, 0, 0)');
}, 'Changing a named container invalidates relevant descendants');
test(function(t) {
t.add_cleanup(() => {
outer.style = '';
intermediate.style = '';
});
assert_equals(getComputedStyle(child).color, 'rgb(0, 0, 0)');
// #intermediate becomes the new container.
intermediate.style = 'container-name:c1; container-type:inline-size';
assert_equals(getComputedStyle(child).color, 'rgb(0, 128, 0)');
// #outer becomes the container again.
intermediate.style = '';
assert_equals(getComputedStyle(child).color, 'rgb(0, 0, 0)');
outer.style.width = '250px';
assert_equals(getComputedStyle(child).color, 'rgb(0, 128, 0)');
}, 'Changing container-name invalidates relevant descendants');
</script>
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