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requesting the output generator to omit the close-tag altogether or
telling the library that the element has declared empty content. In this
case the close-tag is not emitted either, but in addition html//1
interprets Arg in
Tag(Arg) as a list of
attributes rather than the content.
A tag that does not appear in this table is emitted without additional layout. See also print_html/[1,2]. Please consult the library source for examples.