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diff --git a/testing/web-platform/tests/css/css-contain/container-queries/query-content-box.html b/testing/web-platform/tests/css/css-contain/container-queries/query-content-box.html
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+++ b/testing/web-platform/tests/css/css-contain/container-queries/query-content-box.html
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+<!doctype html>
+<title>CSS Container Queries Test: Size queries match content-box</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>
+  .container {
+    container-type: size;
+    border: 10px solid black;
+    padding: 40px;
+    margin: 20px;
+  }
+
+  #container1 {
+    box-sizing: content-box;
+    width: 100px;
+    height: 100px;
+  }
+
+  #container2 {
+    box-sizing: border-box;
+    width: 200px;
+    height: 200px;
+  }
+
+  #container3 {
+    box-sizing: content-box;
+    width: 100px;
+    height: 100px;
+    overflow: scroll;
+  }
+
+  #container4 {
+    box-sizing: border-box;
+    width: 200px;
+    height: 200px;
+    overflow: scroll;
+  }
+
+  @container ((width = 100px) and (height = 100px)) {
+    .target {
+      background-color: green;
+      height: 100%;
+    }
+  }
+</style>
+<div id="container1" class="container">
+  <div class="target"></div>
+</div>
+<div id="container2" class="container">
+  <div class="target"></div>
+</div>
+<div id="container3" class="container">
+  <div class="target"></div>
+</div>
+<div id="container4" class="container">
+  <div class="target"></div>
+</div>
+<script>
+  setup(() => assert_implements_container_queries());
+
+  const green = "rgb(0, 128, 0)";
+
+  test(() => {
+    assert_equals(getComputedStyle(document.querySelector("#container1 > .target")).backgroundColor, green);
+  }, "Size queries with content-box sizing");
+
+  test(() => {
+    assert_equals(getComputedStyle(document.querySelector("#container2 > .target")).backgroundColor, green);
+  }, "Size queries with border-box sizing");
+
+  test(() => {
+    assert_equals(getComputedStyle(document.querySelector("#container3 > .target")).backgroundColor, green);
+  }, "Size queries with content-box sizing and overflow:scroll");
+
+  test(() => {
+    assert_equals(getComputedStyle(document.querySelector("#container4 > .target")).backgroundColor, green);
+  }, "Size queries with border-box sizing and overflow:scroll");
+</script>