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diff --git a/testing/web-platform/tests/html/semantics/popovers/popover-backdrop-appearance-ref.tentative.html b/testing/web-platform/tests/html/semantics/popovers/popover-backdrop-appearance-ref.tentative.html
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+++ b/testing/web-platform/tests/html/semantics/popovers/popover-backdrop-appearance-ref.tentative.html
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+<!DOCTYPE html>
+<meta charset="utf-8" />
+<title>Popover ::backdrop pseudo element appearance</title>
+<link rel="stylesheet" href="resources/popover-styles.css">
+
+<style>
+#bottom { top: 70px; left: 70px; }
+#middle { top: 120px; left: 120px; }
+#top { top: 170px; left: 170px; }
+.fake-popover-backdrop {
+  height: 200px;
+  width: 200px;
+}
+#bottom-backdrop {
+    top: 50px;
+    left: 50px;
+    background-color: rgb(0, 50, 0);
+}
+#middle-backdrop {
+    top: 100px;
+    left: 100px;
+    background-color: rgb(0, 130, 0);
+}
+#top-backdrop {
+    top: 150px;
+    left: 150px;
+    background-color: rgb(0, 210, 0);
+}
+.fake-popover {
+  margin:0;
+}
+</style>
+<p>Test for [popover]::backdrop presence and stacking order. The test passes
+  if there are 3 stacked boxes, with the brightest green on top.</p>
+<div popover id=bottom>Bottom
+  <div popover id=middle>Middle
+    <div popover=manual id=top>Top</div>
+  </div>
+</div>
+<div id="bottom-backdrop" class="fake-popover-backdrop"></div>
+<div id="bottom" class="fake-popover">Bottom</div>
+<div id="middle-backdrop" class="fake-popover-backdrop"></div>
+<div id="middle" class="fake-popover">Middle</div>
+<div id="top-backdrop" class="fake-popover-backdrop"></div>
+<div id="top" class="fake-popover">Top</div>