Test that setting scrollLeft on a subframe works with both scroll behaviors This is a testharness.js-based test. PASS Scroll x:1, y:0, smooth:false PASS Scroll x:4, y:0, smooth:false PASS Scroll x:20, y:0, smooth:true PASS Scroll x:40, y:0, smooth:true PASS Scroll x:4000, y:0, smooth:true PASS Scroll x:10, y:0, smooth:true Harness: the test ran to completion.