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<!DOCTYPE html> <style> .container { touch-action: pan-y; } iframe { position:absolute; top: 50px; left: 50px; width: 100px; height: 100px; } </style> <html> <body> <div class="container"> <iframe src="/cross-site/baz.com/page_with_touch_start_janking_main_thread.html"></iframe> </div> This page contains a positioned cross-origin iframe. </body> </html>