Of all the parameter values for \setupdescriptions[][alternative=value] there
is one that fails here, i.e. "right". right is a value mentioned in
http://wiki.contextgarden.net/Command/setupdescriptions.
Below a minimal example and the error.
\definedescription[htmldd][before=,after=]
\setupdescriptions[htmldd][alternative=right]
\starttext
Text before.\crlf
\starthtmldd{item-1}description\stophtmldd
\starthtmldd{item-2}description\stophtmldd
Text after.
\stoptext
! Undefined control sequence.
system > tex > error on line 5 in file description.tex: Undefined
control sequence ...
\12>:153>:right:none ...nstructions_pure_hang_box
\raggedleft \rlap {\hskip ...
\148>construction ...parameter \c!renderingsetup }
\relax \dostoptagged \dost...
\dodogotopar ...andler \v!construction \endcsname
\BeforePar \emptytoks
<to be read again>
d
l.5 \starthtmldd{item-1}d
escription\stophtmldd
Hans van der Meer
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