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+<!DOCTYPE HTML>
+<html>
+<head>
+ <meta charset="utf-8">
+ <title>StyleSheetsActor iframe test</title>
+ <style>
+ p {
+ padding: 1em;
+ }
+ </style>
+</head>
+<body>
+ <p>A test page with nested iframes</p>
+ <iframe></iframe>
+ <script type="application/javascript">
+ "use strict";
+
+ const iframe = document.querySelector("iframe");
+ let i = parseInt(location.href.split("?")[1], 10) || 1;
+
+ // The frame can't have the same src URL as any of its ancestors.
+ // This will not infinitely recurse because a frame won't get a content
+ // document once it's nested deeply enough.
+ iframe.src = location.href.split("?")[0] + "?" + (++i);
+ </script>
+</body>
+</html>