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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-contain/container-queries/animation-container-type-dynamic.html - WPT Dashboard Interop Dashboard
<!doctype html>
<title>Container Queries - Animated container creating new containers</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
@keyframes anim {
from { width: 200px; }
to { width: 300px; }
}
#container {
container-type: inline-size;
animation: anim 1s linear paused;
}
#target {
background-color: red;
}
#intermediate {
width: 100px;
}
@container (min-width: 250px) {
#intermediate {
container-type: inline-size;
}
}
@container (width: 200px) {
#target {
background-color: blue;
}
}
@container (width: 100px) {
/* Initially queries #container, but later queries #intermediate, when
the other container query starts matching. */
#target {
background-color: green;
}
}
</style>
<div id=container>
<div id=intermediate>
<div id=target>
Test
</div>
</div>
</div>
<script>
setup(() => assert_implements_container_queries());
test(() => {
assert_equals(getComputedStyle(target).backgroundColor, 'rgb(0, 0, 255)');
assert_equals(container.getAnimations().length, 1);
let animation = container.getAnimations()[0];
animation.currentTime = 600;
assert_equals(getComputedStyle(target).backgroundColor, 'rgb(0, 128, 0)');
// Verify that #intermediate is queried by changing its width. The container
// query will stop matching if #intermediate is the queried container.
intermediate.style.width = '110px';
assert_equals(getComputedStyle(target).backgroundColor, 'rgb(255, 0, 0)');
}, 'Animated container creating new container');
</script>