<!DOCTYPE HTML> <html reftest-async-scroll reftest-displayport-x="0" reftest-displayport-y="0" reftest-displayport-w="800" reftest-displayport-h="2000" reftest-async-scroll-x="0" reftest-async-scroll-y="0"> <body style="overflow:hidden; height:3000px; margin:0;"> <!-- Test that position:fixed content stays fixed when we async-scroll --> <iframe style="border:0; width:400px; height:400px;" src="data:text/html, <!DOCTYPE HTML> <html reftest-displayport-x='0' reftest-displayport-y='0' reftest-displayport-w='800' reftest-displayport-h='2000' reftest-async-scroll-x='0' reftest-async-scroll-y='50'> <body style='overflow:hidden; height:3000px'> <div style='position:fixed; background:blue; top:0; left:0; width:200px; height:100px'></div> <div style='background:red; margin-top:100px; width:100px; height:50px'></div> </body> </html> "></iframe> </body> </html>