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Predicate html_print_length/2
 html_print_length(+List, -Len) is det
Determine the content length of a token list produced using html//1. Here is an example on how this is used to output an HTML compatible to HTTP: 
        phrase(html(DOM), Tokens),
        html_print_length(Tokens, Len),
        format('Content-type: text/html; charset=UTF-8~n'),
        format('Content-length: ~d~n~n', [Len]),
        print_html(Tokens)
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