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diff --git a/toolkit/components/pictureinpicture/tests/test-transparent-nested-iframes.html b/toolkit/components/pictureinpicture/tests/test-transparent-nested-iframes.html
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+++ b/toolkit/components/pictureinpicture/tests/test-transparent-nested-iframes.html
@@ -0,0 +1,51 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Picture-in-Picture test - transparent iframe</title>
+</head>
+
+<style>
+  video {
+    display: block;
+  }
+
+  .root {
+    position: relative;
+    display: inline-block;
+  }
+
+  .controls {
+    position: absolute;
+    left: 0;
+    top: 0;
+    width: 100%;
+    height: 100%;
+    color: white;
+  }
+
+  .container,
+  iframe {
+    width: 100%;
+    height: 100%;
+  }
+
+  iframe {
+    border: 0;
+  }
+</style>
+
+<body>
+  <div class="root">
+    <div class="controls">
+      <div class="container">
+        <iframe src="about:blank"></iframe>
+      </div>
+    </div>
+
+    <div class="video-container">
+      <video id="video-transparent-background" src="test-video.mp4" loop="true"></video>
+    </div>
+  </div>
+</body>
+</html>