Joel C. Salomon wrote:

I know for a fact that LuaTeX enables features of OpenType Math fonts
that XeTeX does not. See, e.g.,
<https://github.com/wspr/unicode-math/issues/40>.

And, of course, there are XeTeX-specific features (most prominently
interchartoks) which LuaTeX does not implement.

Avoiding math and engine-specific extensions, I personally have not
*noticed* any differences between the outputs, but given the
differences that exist I doubt anyone would care to guarantee
identical results.

OK, but how about things such as graphics ?  I already know
that I cannot use (e.g.,) \pdfximage, \pdfrefximage and
\pdflastximage in XeTeX, and have to use instead \XeTeXpicfile;
if I were to migrate to LuaTeX, would I be correct in expecting
to find a whole new set of graphics primitives ?  And what of
\XeTeX's extensions to the \font primitive ?

** Phil.


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