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<!doctype html>
<title>CSS Container Queries Test: Column-spanner depending on container in column</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#size-container">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
#multicol {
container-type: inline-size;
width: 600px;
columns: 2;
column-gap: 0;
height: 200px;
}
#spanner { height: 100px; }
@container (width = 600px) {
#spanner {
column-span: all;
}
}
</style>
<div id="multicol">
<div id="spanner"></div>
</div>
<script>
setup(() => assert_implements_container_queries());
test(() => {
assert_equals(getComputedStyle(spanner).width, "600px");
}, "#spanner matching container with column-width 300px, getting column-span:all");
test(() => {
multicol.style.width = "500px";
assert_equals(getComputedStyle(spanner).width, "250px");
}, "Reducing #multicol width means #spanner no longer gets column-span:all");
test(() => {
multicol.style.width = "";
assert_equals(getComputedStyle(spanner).width, "600px");
}, "Back to matching 300px and column-span:all");
</script>
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