CSS text-shadow (first shadow only), 'none', or 'auto': a thin halo in the text's contrast color. Tick labels default to 'auto', so they read over the lines.
size?
number
Font size in CSS px. Minimum: 1
style?
"normal" | "italic"
Font style.
weight?
number | "normal" | "bold"
Font weight: a CSS numeric weight (1–1000), normal or bold. Range: 1 – 1000