Scroll Vertical Not Horizontal

Thisisareallywidelinethatshereatthestartsowehaveahorizontalscrollbar.Thisisareallywidelinethatshereatthestartsowehaveahorizontalscrollbar.Thisisareallywidelinethatshereatthestartsowehaveahorizontalscrollbar.

Anchor is here, and should cause a vertical scroll only, not a horizontal scroll.

So, if the test succeeds, the text below should say that we're at the left but not at the top.

This is very tall line that's here at the end so we have a vertical scroll bar.