BLOB_APPEND_LITERAL(ob, "  </tr>\n");
}

static int html_footnote_ref(
  struct Blob *ob, const struct Blob *span, int index, int locus, void *opaque
){
  const struct MarkdownToHtml *ctx = (struct MarkdownToHtml*)opaque;
  /* expect BUGs if the following yields compiler warnings */

  if( index>0 && locus>0 ){
    const bitfield64_t l = to_base26(locus-1,0);
    char pos[32];


    memset(pos,0,32);
    sprintf(pos, "%s-%i-%s", ctx->unique.c, index, l.c);

    if(span && blob_size(span)) {
      BLOB_APPEND_LITERAL(ob,"<span class='notescope' id='noteref");
      blob_appendf(ob,"%s'>",pos);
      BLOB_APPEND_BLOB(ob, span);
      blob_trim(ob);
      BLOB_APPEND_LITERAL(ob,"<sup><a class='noteref' href='#footnote");
      blob_appendf(ob,"%s'>%i</a></sup></span>", pos, index);
    }else{
      blob_trim(ob);
      BLOB_APPEND_LITERAL(ob,"<sup><a class='noteref' href='#footnote");
      blob_appendf(ob,"%s' id='noteref%s'>%i</a></sup>",
                      pos,            pos,   index);
    }
  }else if(span && blob_size(span)) {
    BLOB_APPEND_LITERAL(ob, "<span class='notescope' id='misref");
    blob_appendf(ob, "%s-%i'>", ctx->unique.c, -index);
    BLOB_APPEND_BLOB(ob, span);
    blob_trim(ob);
    BLOB_APPEND_LITERAL(ob,
          "<sup class='misref'>misreference</sup></span>");
  }else{
    blob_trim(ob);
    BLOB_APPEND_LITERAL(ob, "<sup class='misref' id='misref");
    blob_appendf(ob, "%s-%i", ctx->unique.c, -index);
    BLOB_APPEND_LITERAL(ob, "'>misreference</sup>");
  }
  return 1;
}

/* Render a single item of the footnotes list.
 * Each backref gets a unique id to enable dynamic styling. */
static void html_footnote_item(