14 lines
330 B
HTML
14 lines
330 B
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<meta name="viewport" content="width=device-width">
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<title>Long Task Frame</title>
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<body>
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<h1>Long Task plus PostMessage</h1>
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<script>
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const begin = window.performance.now();
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while (window.performance.now() < begin + 60);
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window.opener.postMessage('Finished.', '*');
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</script>
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</body>
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