sS jlabel_fixImages(S html) {
  L<S> tok = htmlTok(html);
  for (int i = 1; i < l(tok); i += 2) {
    S t = tok.get(i);
    continue unless tagIs(t, "img");
    SS params = htmlParams(t);
    S src = params.get("src");
    continue unless isSnippetID(src);
    pcall {
      File f = loadImageAsFile(src);
      params = mapPlus(params, "src", /*f2s(f)*/f.toURI());
      tok.set(i, hopeningTag("img", params));
    }
  }
  ret join(tok);
}

Began life as a copy of #1016069