Span and FlowDoucment
<FlowDocument xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"> <Paragraph> <Bold>bold</Bold> <Italic>italic</Italic> <Underline>underline</Underline> <Hyperlink>hyperlink</Hyperlink> <Span BaselineAlignment="Superscript">superscript</Span> <Span BaselineAlignment="Subscript">subscript</Span> <Span> <Span.TextDecorations> <TextDecoration Location="Strikethrough"/> </Span.TextDecorations> strikethrough </Span> </Paragraph> </FlowDocument>