MyCSS_PROPERTY_STROKE_LINEJOIN_BEVEL

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_STROKE_LINEJOIN_BEVEL = mycss_property_stroke_linejoin.MyCSS_PROPERTY_STROKE_LINEJOIN_BEVEL;

Meta