subframe-with-longtask.html (273B)
1 <!DOCTYPE HTML> 2 <meta charset=utf-8> 3 <meta name="viewport" content="width=device-width"> 4 5 <title>Long Task Iframe</title> 6 <h1>Long Task in Inline Script</h1> 7 8 <script> 9 const begin = window.performance.now(); 10 while (window.performance.now() < begin + 60); 11 </script>