MyCSS_SELECTORS_SUB_TYPE_PSEUDO_CLASS_EMPTY

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_EMPTY = mycss_selectors_sub_type_pseudo_class.MyCSS_SELECTORS_SUB_TYPE_PSEUDO_CLASS_EMPTY;

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