Tests that CSS styling from an external style sheet is supported.
For each of a representative sampling of selectors, a 'visibility: hidden' style rule is specified to match a corresponding element in the markup. Identically shaped and sized elements (but which are not applicable to any of the style selectors) are placed beneath them and should be visible if the style sheet was applied correctly.
Run the test. No interaction required.
The test passes if there are seven blue shapes on the page.