.h.htac[x;y;z]
Where x is the element as a symbol atom, y is a dictionary of attributes and their values,
and z is the content of the node as a string, returns as a string the HTML element.
q).h.htac[`a;(`href`target)!("http://www.example.com";"_blank");"Example.com Main Page"]
"<a href=\"http://www.example.com\" target=\"_blank\">Example.com Main Page</..