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<!DOCTYPE html> <html> <head> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="/resources/testdriver.js"></script> <script src="/resources/testdriver-actions.js"></script> <script src="/resources/testdriver-vendor.js"></script> <style> body { margin: 0; padding: 10px; } .space { height: 2000px; } #scroller { border: 3px solid green; position: absolute; z-index: 0; overflow: auto; padding: 10px; width: 250px; height: 150px; } .ifr { border: 3px solid blue; width: 200px; height: 100px; } </style> </head> <body> <div id=scroller> <iframe srcdoc="SCROLL ME" class=ifr></iframe> <div class=space></div> </div> <div class=space></div> <script> promise_test(async t => { await new test_driver.Actions().scroll(50, 50, 0, 50).send(); assert_equals(scroller.scrollTop, 50); }, "Wheel scroll in iframe chains to containing element."); </script> </body> </html>