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- <!DOCTYPE html>
- <html>
- <head>
- <title>Choose a File</title>
- </head>
- <body>
- <h2>I'm supposed to be an invisible iframe... (you shouldn't see this)</h2>
- <script>
- let uauthBC = new BroadcastChannel("uauth");
- window.addEventListener("message", function(e) {
- uauthBC.postMessage(e.data);
- window.parent.postMessage("acknowledged", "*");
- }, false);
- </script>
- </body>
- </html>
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