One block of a FlowDocument: something laid out top to bottom in the content area, breaking across pages. Every block names the structure element it becomes when the output is tagged.
public abstract class FlowBlock
ISO 32000-2 §14.8.4 (standard structure types) and §14.9.2 (natural language specification): StructureType and Language are what tagged output writes for the block.
kind:method, kind:property, kind:ctor. Press Esc to clear.LanguageThe natural language of the block as a BCP 47 tag (such as en-US), or null to inherit the document's.StructureTypeThe standard structure type of the block when tagged, such as P or H1.