This extended version of html_receive//1 causes Handler to be
called to process all messages posted to the channal at the time
output is generated. Handler is called as below, where
PostedTerms is a list of Module:Term created from calls to
html_post//2. Module is the context module of html_post and Term
is the unmodified term. Members in PostedTerms are in the
order posted and may contain duplicates.
phrase(Handler, PostedTerms, HtmlTerms, Rest)
Typically, Handler collects the posted terms, creating a term
suitable for html//1 and finally calls html//1.
