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diff --git a/testing/web-platform/tests/css/css-contain/content-visibility/content-visibility-auto-in-iframe-ref.html b/testing/web-platform/tests/css/css-contain/content-visibility/content-visibility-auto-in-iframe-ref.html
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+++ b/testing/web-platform/tests/css/css-contain/content-visibility/content-visibility-auto-in-iframe-ref.html
@@ -0,0 +1,25 @@
+<!doctype HTML>
+<html>
+<meta charset="utf8">
+<title>CSS Content Visibility: auto container in an iframe (reference)</title>
+<link rel="author" title="Martin Robinson" href="mailto:mrobinson@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
+
+<iframe id="frame" srcdoc='
+  <style>
+  #container {
+    width: 200px;
+    height: 200px;
+  }
+  #child {
+    width: 100px;
+    height: 100px;
+    background: green;
+  }
+  </style>
+  <div id="container">
+    <div id="child"></div>
+  </div>
+  hello
+'></iframe>
+</html>