Title default is set as font-weight: bold in the Template Configuration Window under Template Options in the Restricted Formatting Styles.
Subtitle default is set as font-style: italic in the same place as the Title.
Smallest = font-size: xx-small
Smaller = font-size: x-small
Small = font-size: small
Normal = font-size: medium
Large = font-size: large
Larger = font-size: x-large
Largest = font-size: xx-large