Stroke (outline) CSS color string (e.g. #e53935).
Interior (fill) CSS color for closed shapes (rectangle/ellipse), or null for no fill.
Text size in PDF points for rectangle/text-box contents.
Stroke opacity 0-1 (baked into the stroke color's alpha).
Stroke width in PDF points.
Horizontal placement of text within rectangle/text-box annotations.
Text CSS color for rectangle/text-box contents.
Vertical placement of text within rectangle/text-box annotations.
Style applied to newly drawn annotations.