MyCSS_SELECTORS_SUB_TYPE_PSEUDO_CLASS_UNDEF

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_SELECTORS_SUB_TYPE_PSEUDO_CLASS_UNDEF = mycss_selectors_sub_type_pseudo_class.MyCSS_SELECTORS_SUB_TYPE_PSEUDO_CLASS_UNDEF;

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