<!DOCTYPE HTML> <html reftest-async-scroll> <body> <!-- Test that nested active scrolling elements work --> <div style="width:400px; height:500px; overflow:scroll; scrollbar-width: none; border:2px solid black" 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"> <div style="width:300px; height:800px; overflow:scroll; scrollbar-width: none; border:2px solid blue" 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"> <div style="height:500px"></div> <div style="height:200px; background:purple"></div> <div style="height:500px"></div> </div> </div> </html>