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+<!doctype html>
+<title>CSS Container Queries Test: Query multicol container</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: 400px;
+ column-count: 2;
+ column-gap: 0;
+ }
+ @container (width = 400px) {
+ #first-child { color: green; }
+ #second-child { color: green; }
+ }
+</style>
+<div id="multicol">
+ <div id="first-child">First</div>
+ <div id="second-child">Second</div>
+</div>
+<script>
+ setup(() => assert_implements_container_queries());
+
+ test(() => {
+ const green = "rgb(0, 128, 0)";
+ assert_equals(getComputedStyle(document.querySelector("#first-child")).color, green);
+ assert_equals(getComputedStyle(document.querySelector("#second-child")).color, green);
+ }, "Children of multicol inline-size container should match inline-size of the container");
+</script>