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diff --git a/testing/web-platform/tests/css/css-position/sticky/position-sticky-inline-ref.html b/testing/web-platform/tests/css/css-position/sticky/position-sticky-inline-ref.html
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index 0000000000..d3b4869afe
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+++ b/testing/web-platform/tests/css/css-position/sticky/position-sticky-inline-ref.html
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+<!DOCTYPE html>
+<title>Reference for position:sticky should work for inline elements</title>
+
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+.group {
+  display: inline-block;
+  position: relative;
+  width: 150px;
+  height: 250px;
+}
+
+.scroller {
+  position: relative;
+  width: 100px;
+  height: 200px;
+  overflow-x: hidden;
+  overflow-y: auto;
+  font: 25px/1 Ahem;
+}
+
+.contents {
+  height: 500px;
+}
+
+.indicator {
+  position: absolute;
+  left: 0;
+  color: green;
+}
+
+.inline {
+  display: inline;
+}
+</style>
+
+<script>
+window.addEventListener('load', function() {
+  document.getElementById('scroller1').scrollTop = 50;
+  document.getElementById('scroller2').scrollTop = 125;
+  document.getElementById('scroller3').scrollTop = 250;
+});
+</script>
+
+<div>You should see three green rectangles below. No red or blue should be visible.</div>
+
+<div class="group">
+  <div id="scroller1" class="scroller">
+    <div class="contents">
+      <div class="indicator inline" style="top: 150px;">XXX</div>
+    </div>
+  </div>
+</div>
+
+<div class="group">
+  <div id="scroller2" class="scroller">
+    <div class="contents">
+      <div class="indicator inline" style="top: 175px;">XXX</div>
+    </div>
+  </div>
+</div>
+
+<div class="group">
+  <div id="scroller3" class="scroller">
+    <div class="contents">
+      <div class="indicator inline" style="top: 275px;">XXX</div>
+    </div>
+  </div>
+</div>