What focal part of the casket interior fills the inside of the crown and may be bordered by the roll?

The cap panel is the correct answer because it specifically refers to the focal area of the casket's interior that occupies the upper section of the crown. This part is often designed to be visually appealing and can feature a variety of materials and colors. The cap panel is typically bordered by a roll, which is a pleated or padded material that provides a finished look and adds to the overall aesthetic and structural integrity.

Understanding the components of a casket is essential for discussions of funeral service arrangements, as each part plays a role in both functionality and symbolism. The interior lining, head panel, and casket bottom serve other purposes; for example, the interior lining pertains to the fabric that lines the entire interior of the casket, while the head panel is specifically a part of the casket that covers the deceased's head area, and the casket bottom is the base that supports the entire structure. Each of these components contributes to the overall design and function of the casket but do not specifically fill the crown like the cap panel does.