anchor.diff:  |font_style: italic
   |===
   
  -=== Thematic Break
  +=== Thematic break
   
   [cols="1d,1d,2m"]
   |===
  
positive.code:   font_size_large: ceil($base_font_size * 1.25)
  ----
  
  === Measurement Units
  
  Several of the keys require a value in points (pt), the unit of measure for the PDF canvas.
  A point is defined as 1/72 of an inch.
  
negative.code:   - Alignment (left, center, right, justify)
    - Color as hex string (e.g., #ffffff)
    - Image path
  * Number (integer or float) with optional units (default unit is points)
  * Array
    - Color as RGB array (e.g., [51, 51, 51])
    - Color CMYK array (e.g., [50, 100, 0, 0])
  