MyCSS_PROPERTY_BORDER_BOTTOM_STYLE_UNSET

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C)
enum MyCSS_PROPERTY_BORDER_BOTTOM_STYLE_UNSET = mycss_property_border_bottom_style.MyCSS_PROPERTY_BORDER_BOTTOM_STYLE_UNSET;

Meta