Interfaces
 InterfaceDescription
 IHighlighter 
Classes
 ClassDescription
 HaloHighlighter This class facilitates drawing of squiggly lines below words for TextField class.
 SparkHighlighter This class facilitates drawing of squiggly lines below words for RichEditableText class.
 TLFHighlighter This class facilitates drawing of squiggly lines below words for TLF TextFlow class. The TextFlow class is responsible for managing all the text content of a story.