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diff --git a/testing/web-platform/tests/css/css-position/sticky/position-sticky-table-th-bottom-ref.html b/testing/web-platform/tests/css/css-position/sticky/position-sticky-table-th-bottom-ref.html
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+++ b/testing/web-platform/tests/css/css-position/sticky/position-sticky-table-th-bottom-ref.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<title>Reference for position:sticky bottom constraint should behave correctly for &lt;th&gt; elements</title>
+
+<style>
+.group {
+  display: inline-block;
+  position: relative;
+  width: 150px;
+  height: 200px;
+}
+
+.scroller {
+  position: relative;
+  width: 100px;
+  height: 150px;
+  overflow-x: hidden;
+  overflow-y: auto;
+}
+
+.contents {
+  height: 550px;
+}
+
+.indicator {
+  position: absolute;
+  background-color: green;
+  left: 0;
+  height: 50px;
+  width: 50px;
+}
+</style>
+
+<script>
+window.addEventListener('load', function() {
+  document.getElementById('scroller1').scrollTop = 0;
+  document.getElementById('scroller2').scrollTop = 75;
+  document.getElementById('scroller3').scrollTop = 200;
+});
+</script>
+
+<div>You should see three green boxes below. No red should be visible.</div>
+
+<div class="group">
+  <div id="scroller1" class="scroller">
+    <div class="indicator" style="top: 100px;"></div>
+    <div class="contents"></div>
+  </div>
+</div>
+
+<div class="group">
+  <div id="scroller2" class="scroller">
+    <div class="indicator" style="top: 150px;"></div>
+    <div class="contents"></div>
+  </div>
+</div>
+
+<div class="group">
+  <div id="scroller3" class="scroller">
+    <div class="indicator" style="top: 250px;"></div>
+    <div class="contents"></div>
+  </div>
+</div>