Consider using visibility checks from actionability within toBeVisible

The checks that toBeVisible performs are pretty limited because it is designed to work with jsdom, where there is no real rendering engine. Since we have the benefit of having a real browser, we could make the checks more complete by replacing the implementation. It would probably even be possible to share the implementation with our visibility checks from the actionability checks.

Start by locating the toBeVisible implementation and the visibility checks used by actionability checks. Compare their current behavior in a real browser, then determine whether the checks can be shared; done means toBeVisible performs the more complete browser-based visibility checks without losing its existing purpose.

Written by the indexing model from the issue text.