Test event bubbling of event attributes.

The first 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 below the circles describes what should occur.

The second two circles test whether events are handled in the proper order. Events listeners and event attributes are processed before hyperlink processing, which is processed before text selection. The supplemental text below the circles describes what should occur.

The last three strings tests event handling behavior on text. Text selection only is available after event listeners and event attributes have been processed, and after hyperlink processing has occurred. The supplemental text below the text strings describes what should occur.