<!doctype html>
<title>container-type invalidation</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-type">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
div {
color: black;
}
#outer {
width: 300px;
}
#intermediate {
width: 250px;
}
#inner {
width: 200px;
}
.container {
container-type: inline-size;
}
@container ((max-width: 200px) or (min-width: 300px)) {
#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(() => {
for (let e of [outer, intermediate, inner])
e.classList.remove('container');
});
// No container.
assert_equals(getComputedStyle(child).color, 'rgb(0, 0, 0)');
outer.classList.add('container');
assert_equals(getComputedStyle(child).color, 'rgb(0, 128, 0)');
// The container query does not match widths in the range [201, 299],
// and #intermediate has width:250px.
intermediate.classList.add('container');
assert_equals(getComputedStyle(child).color, 'rgb(0, 0, 0)');
inner.classList.add('container');
assert_equals(getComputedStyle(child).color, 'rgb(0, 128, 0)');
// Should have no effect, #inner is the container.
outer.classList.remove('container');
intermediate.classList.remove('container');
assert_equals(getComputedStyle(child).color, 'rgb(0, 128, 0)');
inner.classList.remove('container');
assert_equals(getComputedStyle(child).color, 'rgb(0, 0, 0)');
}, 'Changing the container type invalidates relevant descendants');
</script>
Codebase Browser
chromium