This includes the following fixes:
1. fix error in `WindowMock.setWidthTo`
It was returning height, not width.
2. Fix for `WindowMock.reset`
Changes to the scroll position need to go
through the `scrollTo` method.
It also includes the following changes
1. Improve mocking of window scrollTop
Increases the number of DOM API methods mocked
to return the intended scrollTop value.
2. Change WindowMock.scrollBy to
WindowMock.scrollTo
Because you're not scrolling by an amount,
you're scrolling to a position.
3. Give WindowMock getters for position/dimension
It's useful to be able to get the
position/dimension of the window in tests when
you're resizing and scrolling it as part of the
test.
4. Assign WindowMock spies on instantiation
Assigning them whenever a dimension is set doesn't
make sense. You're just setting a value, not
changing how that value is accessed.
This module creates a clone of the existing table
as an extra layer which sits on top of it.
This allows the row headers to sit above the table
content when it scrolls.
We were setting `role=presentation` on the extra
table to hide it from assistive technologies.
It seems that this wasn't working. From the spec'
`role-presentation` should remove the semantics of
the table but leave the content.
Testing in Safari, with the OSX Accessibility
Inspector, this isn't happening and the table is
still being reported as a table by the
accessibility API.
This changes to the `aria-hidden` attribute, to
make sure the extra table is ignored.
