> +(defface help-key-binding
> +  '((((class color) (min-colors 88)) :foreground "ForestGreen")
> +    (((class color) (min-colors 16)) :foreground "green")
> +    (((class color) (min-colors 8)) :foreground "green")
> +    (((class color grayscale) (background light)) :foreground "grey15")
> +    (((class color grayscale) (background dark)) :foreground "grey85")
> +    (t :foreground "ForestGreen"))
> +  "Face for keybindings in *Help* buffers.

I wonder why green?  It looks quite weird.  All the most popular
markup renderers nowadays such as GitHub and GitLab display keybindings
using light grey background like this: