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<html> <style> #janktest{ width: 1000px; height: 10000px; } </style> <body onload='setup()'> <div id="janktest"></div> </body> <script> function setup() { document.getElementById('janktest').addEventListener('touchstart', (e) => { var end = performance.now() + 1200; while (performance.now() < end); }, {passive: false}); } </script> </html>