tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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frame-with-longtask.html (330B)

      1 <!DOCTYPE HTML>
      2 <meta charset=utf-8>
      3 <meta name="viewport" content="width=device-width">
      4 
      5 <title>Long Task Frame</title>
      6 <body>
      7 <h1>Long Task plus PostMessage</h1>
      8 
      9 <script>
     10  const begin = window.performance.now();
     11  while (window.performance.now() < begin + 60);
     12  window.opener.postMessage('Finished.', '*');
     13 </script>
     14 </body>