abc:before  { content: 'ABC'; }
  pre.src-coq:before  { content: 'Coq'; }
  pre.src-groovy:before  { content: 'Groovy'; }
  /* additional language identifiers from org-babel-shell-names in
     ob-shell.el: ob-shell is the only babel language using a lambda to put
     the execution function name together. */
  pre.src-bash:before  { content: 'bash'; }
  pre.src-csh:before  { content: 'csh'; }
  pre.src-ash:before  { content: 'ash'; }
  pre.src-dash:before  { content: 'dash'; }
  pre.src-ksh:befor