When 'rect' attributes 'rx' and 'ry' have a value greater than half of the width/height of the rectangle, they are treated as half the width/height of the rectangle.
The test creates one 'rect' element with 'rx' greater than 1/2 the 'rect' width. Underneath that element, it creates a red 'rect' element with 'rx' set to 1/2 the width. Repeats with 'ry' attribute.
Run the test. No interaction required.
Test passes if there is no red visible on the page.