A couple of small issues with the css for epub output. First, back-exp.lua creates, in \jobname-styles.css @namespace context url('%namespace%') ; This should probably be: @namespace context url('http://www.pragma-ade.com/context/export') ; That file also has: document, %namespace%div.document { font-size : %size% !important ; max-width : %width% !important ; text-width : %align% !important ; hyphens : %hyphens% !important ; } which contains the invalid css property text-width. Perhaps that should be text-align or text-justify. Something else appears to be creating, in \jobname-defaults.css: pubfld[detail="title"], div.pubfld.title { display : inline ; font-weight : italic ; } which incorrectly assigns italic to font-weight when of course it is a font-style as far as css is concerned. This can be seen in file export-example.css in the distribution. -- Rik