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Predicate print_html_head/2
 print_html_head(+Out:stream, +Options) is det[private]
Print the DOCTYPE line and HTML header. Options:
header(Bool)
Only print the header if Bool is not false
title(Title)
Title of the HTML document
stylesheets(List)
Reference to the CSS style-sheets.
format_comments(Bool)
If true (default), format structured comments.
skin(Closure)
Called using call(Closure, Where, Out), where Where is one of header or footer. These calls are made just after opening body and before closing body.