<html reftest-async-scroll reftest-async-scroll-x="0" reftest-async-scroll-y="200"> <head> <style> .fixedpos { transform: translateX(0px); position: fixed; top: 0; width: 100%; height: 100px; background: red; } .filler { height: 4000px; } </style> </head> <body> <div class="fixedpos"></div> <div class="filler"></div> </body> </html>