Test event bubbling of event attributes, part a.
The two circles test whether event bubbling is occurring to parents of the target object, and whether the target object is able to prevent bubbling. The supplemental text next to the circles describes what should occur.
This test requires user interaction. Firstly, move the pointer over the top circle. Then, move it over the bottom circle.
The test is passed if two black circles are displayed. The top circle must turn pink when the pointer is over the circle, and go back to black once the pointer leaves. The second circle must turn blue when the pointer is over the circle, and go back to black once the pointer leaves.