[tex4ht] how to make \usepackage{newtxtext} work with tex4ht? it removes "fi" and "ff" from text

Nasser M. Abbasi nma at 12000.org
Wed Jul 1 23:11:10 CEST 2015

When I compile this MWE

       find differential
The HTML shows

       nd dierential

So the "fi" and "ff" are gone. (looking at the HTML source code itself,
I see strange looking things where these letters are supposed to be,
like small squares with 4 dots in them)

I see these errors/messages

tex4ht.c (2012-07-25-19:36 kpathsea)
tex4ht -f/foo.tex
--- warning --- Couldn't find font `ntx-Regular-tlf-t1.htf' (char codes: 0--255)

Complied using
htlatex foo.tex

Also tried make4ht and same result. Tried making math as SVG, no
difference. the "fi" and "ff" are lost.

specs: TL 2015
>which htlatex



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