The "Styled Text" theme contains the language commands used for managing and modifying multi-style text areas, also known as rich text areas.
You declare a rich text area by enabling its "Multi-style" option in the Property List (see GET DATA SOURCE LIST in the Design Reference manual). You can use the OBJECT Is styled text command of the "Objects (Forms)" theme to find out whether or not a text area is in multi-style mode.
Most commands of the "Styled Text" theme support 4D Write Pro areas. For more information about this point, refer to the Using commands from the Styled Text theme section in the 4D Write Pro Reference manual.