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diff --git a/testing/web-platform/tests/css/css-contain/container-queries/grid-item-container.html b/testing/web-platform/tests/css/css-contain/container-queries/grid-item-container.html
new file mode 100644
index 0000000000..f1c66efc26
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+++ b/testing/web-platform/tests/css/css-contain/container-queries/grid-item-container.html
@@ -0,0 +1,38 @@
+<!doctype html>
+<title>CSS Container Queries Test: Grid item 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>
+  #grid {
+    width: 300px;
+    display: grid;
+    grid-template-columns: 2fr 1fr;
+  }
+  .item {
+    container-type: inline-size;
+  }
+  @container (width > 50px) {
+    .item div { color: lime; }
+  }
+  @container (width > 150px) {
+    .item div { color: green; }
+  }
+</style>
+<div id="grid">
+  <div class="item">
+    <div id="target1"></div>
+  </div>
+  <div class="item">
+    <div id="target2"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_container_queries());
+
+  test(() => {
+    assert_equals(getComputedStyle(target1).color, "rgb(0, 128, 0)", "First item container should be 200px wide");
+    assert_equals(getComputedStyle(target2).color, "rgb(0, 255, 0)", "Second item container should be 100px wide");
+  }, "Check that children can query grid item containers");
+</script>