MyCSS_PROPERTY_BORDER_BOTTOM_WIDTH_THIN

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_WIDTH_THIN = mycss_property_border_bottom_width.MyCSS_PROPERTY_BORDER_BOTTOM_WIDTH_THIN;

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