emmet.vim

function! s:expand_html_tab()

" try to determine if we're within quotes or tags.
" if so, assume we're in an emmet fill area.
 let line = getline('.')
 if col('.') < len(line)
   let line = matchstr(line, '[">][^<"]*\%'.col('.').'c[^>"]*[<"]')
   if len(line) >= 2
      return "\<C-n>"
   endif
 endif

" expand anything emmet thinks is expandable.
if emmet#isExpandable()
  return emmet#expandAbbrIntelligent("\<tab>")
endif

" return a regular tab character
return "\<tab>"

endfunction