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Predicate show_html_hook/1
 prolog_help:show_html_hook(+HTML)[multifile, library(pengines_io)]
Hook into help/1 to render the help output in the SWISH console.
 show_html_hook(+HTML:string) is semidet[multifile, library(help)]
Hook called to display the extracted HTML document. If this hook fails the HTML is rendered to the console as plain text using html_text/2.