Element #2. Triple click around the content or in the marginal space.
Element #3. Triple click around the content or in the marginal space.
Element #4. Triple click around the content, in the marginal space, or below.
Element #5. Triple click around the content or in the marginal space.
Triple click in non-I-beam regions behaves inconsistently. Tendency is to highlight the content in the previous element (which seems wrong). However, when an element is given certain display properties, the element's next sibling responds differently (seemingly correctly) to triple clicks.