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diff --git a/testing/web-platform/tests/css/css-contain/content-visibility/content-visibility-023-ref.html b/testing/web-platform/tests/css/css-contain/content-visibility/content-visibility-023-ref.html
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+<!doctype HTML>
+<html>
+<meta charset="utf8">
+<title>Content Visibility: hidden iframe (reference)</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
+
+<style>
+div {
+  background: blue;
+  color: white;
+}
+</style>
+
+<div>Test passes if the word “PASS” and a green box can been seen below.</div>
+<iframe width=400 height=200 srcdoc='
+  <style>
+  div {
+    background: green;
+  }
+  </style>
+  <div>PASS</div>
+'></iframe>
+<div>Lorem ipsum consectetur adipiscing elit</div>