MyCSS_PROPERTY_ANIMATION_FILL_MODE_BOTH

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_ANIMATION_FILL_MODE_BOTH = mycss_property_animation_fill_mode.MyCSS_PROPERTY_ANIMATION_FILL_MODE_BOTH;

Meta