Before test 1

Item 1 (no priority) Item 2 (has priority) Item 3 (no priority)

After test 1

Before test 2

First (no priority) Second (no priority)

After test 2

Before test 3

Early (has priority) Later (has priority)

After test 3

Before test 4

Button 1 Button 2 (has priority) Button 3

After test 4