all flextable tags:

• as_flextable (5)
• border (1)
• caption (1)
• cell-content (3)
• color (2)
• compose (4)
• dimensions (1)
• headers (2)
• image (2)
• model (2)
• pharma (1)
• plot (1)
• settings (2)
• tabulator (2)
• theme (1)