template outputHTML() {
  private import
    std.algorithm,
    std.array,
    std.container,
    std.exception,
    std.file,
    std.getopt,
    std.json,
    std.process,
    std.stdio,
    std.path,
    std.range,
    std.regex,
    std.string,
    std.traits,
    std.typecons,
    std.uni,
    std.utf,
    std.conv : to;
  import
    defaults,
    output_rgx,
    output_xhtmls;
  mixin outputXHTMLs;
  
  void scroll(D,I)(
    auto return ref const D    doc_abstraction,
    auto return ref I          doc_matters,
  ) {
    mixin SiSUoutputRgxInit;
    auto xhtml_format = outputXHTMLs();
    auto rgx = Rgx();
    string[] doc_html;
    string[] doc;
    string suffix = ".html";
    foreach (part; doc_matters.keys_seq_scroll) {
      foreach (obj; doc_abstraction[part]) {
        switch (obj.use) {
        case "frontmatter":
          switch (obj.is_of) {
          case "para":
            switch (obj.is_a) {
            case "heading":
              doc_html ~= xhtml_format.heading_scroll(obj, suffix);
              break;
            case "toc":
              doc_html ~= xhtml_format.para_scroll(obj, suffix);
              break;
            default:
              if ((doc_matters.opt_action_bool["debug"])) {
                writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
              }
              break;
            }
            break;
          default:
            if ((doc_matters.opt_action_bool["debug"])) {
              writeln(__FILE__, ":", __LINE__, ": ", obj.is_of);
            }
            break;
          }
          break;
        case "body":
          switch (obj.is_of) {
          case "para":
            switch (obj.is_a) {
            case "heading":
              doc_html ~= xhtml_format.heading_scroll(obj, suffix);
              break;
            case "para":
              doc_html ~= xhtml_format.para_scroll(obj, suffix);
              break;
            default:
              if ((doc_matters.opt_action_bool["debug"])) {
                writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
              }
              break;
            }
            break;
          case "block":
            switch (obj.is_a) {
            case "poem":
              break;
            case "verse":
              doc_html ~= xhtml_format.nugget(obj);
              break;
            case "group":
              doc_html ~= xhtml_format.nugget(obj);
              break;
            case "block":
              doc_html ~= xhtml_format.nugget(obj);
              break;
            case "quote":
              doc_html ~= xhtml_format.nugget(obj);
              break;
            case "table":
              doc_html ~= xhtml_format.para_scroll(obj, suffix);
              break;
            case "code":
              doc_html ~= xhtml_format.code(obj);
              break;
            default:
              if ((doc_matters.opt_action_bool["debug"])) {
                writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
              }
              break;
            }
            break;
          default:
            if ((doc_matters.opt_action_bool["debug"])) {
              writeln(__FILE__, ":", __LINE__, ": ", obj.is_of);
            }
            break;
          }
          break;
        case "backmatter":
          switch (obj.is_of) {
          case "para":
            switch (obj.is_a) {
            case "heading":
              doc_html ~= xhtml_format.heading_scroll(obj, suffix);
              break;
            case "endnote":
              doc_html ~= xhtml_format.para_scroll(obj, suffix);
              break;
            case "glossary":
              doc_html ~= xhtml_format.para_scroll(obj, suffix);
              break;
            case "bibliography":
              doc_html ~= xhtml_format.para_scroll(obj, suffix);
              break;
            case "bookindex":
              doc_html ~= xhtml_format.para_scroll(obj, suffix);
              break;
            case "blurb":
              doc_html ~= xhtml_format.para_scroll(obj, suffix);
              break;
            default:
              if ((doc_matters.opt_action_bool["debug"])) {
                writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
              }
              break;
            }
            break;
          default:
            if ((doc_matters.opt_action_bool["debug"])) {
              writeln(__FILE__, ":", __LINE__, ": ", obj.is_of);
            }
            break;
          }
          break;
        case "comment":
          break;
        default:
          if ((doc_matters.opt_action_bool["debug"])) {
            writeln(__FILE__, ":", __LINE__, ": ", obj.use);
            writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
            writeln(__FILE__, ":", __LINE__, ": ", obj.text);
          }
          break;
        }
      }
    }
    doc = xhtml_format.scroll_head(doc_matters.dochead_meta) ~ doc_html ~ xhtml_format.tail;
    scroll_write_output(doc_matters.source_filename, doc);
  }
  void scroll_write_output(Fn,C)(
    Fn fn_src,
    C doc,
  ) {
    debug(asserts){
      static assert(is(typeof(fn_src) == string));
      static assert(is(typeof(doc)    == string[]));
    }
    mixin SiSUpaths;
    auto pth_html = HtmlPaths();
    try {
      if (!exists(pth_html.base)) {
        mkdirRecurse(pth_html.base);
      }
      auto f = File(pth_html.fn_scroll(fn_src), "w");
      foreach (o; doc) {
        f.writeln(o);
      }
    }
    catch (ErrnoException ex) {
      // Handle error
    }
  }
  void seg(D,I)(
    auto return ref const D    doc_abstraction,
    auto return ref I          doc_matters,
  ) {
    mixin SiSUoutputRgxInit;
    auto rgx = Rgx();
    auto xhtml_format = outputXHTMLs();
    string[][string] doc_html;
    string[][string] doc_html_endnotes;
    string[] doc;
    string segment_filename;
    string[] top_level_headings = ["","","",""];
    string suffix = ".html";
    foreach (part; doc_matters.keys_seq_seg) {
      foreach (obj; doc_abstraction[part]) {
        if (obj.is_a == "heading") {                            // all headings: frontmatter, body & backmatter
          switch (obj.heading_lev_markup) {
          case 0: .. case 3:
            /+ fill buffer, and replace with new levels from 1 to 3 +/
            switch (obj.heading_lev_markup) {
            case 0:
              top_level_headings[0] = "";
              top_level_headings[1] = "";
              top_level_headings[2] = "";
              top_level_headings[3] = "";
              goto default;
            case 1:
              top_level_headings[1] = "";
              top_level_headings[2] = "";
              top_level_headings[3] = "";
              goto default;
            case 2:
              top_level_headings[2] = "";
              top_level_headings[3] = "";
              goto default;
            case 3:
              top_level_headings[3] = "";
              goto default;
            default:
              auto t = xhtml_format.heading_seg(obj, suffix);
              top_level_headings[obj.heading_lev_markup] = t[0];
              break;
            }
            break;
          case 4:
            segment_filename = obj.segment_anchor_tag;
            doc_html[segment_filename] ~= xhtml_format.seg_head(doc_matters.dochead_meta);
            foreach (top_level_heading; top_level_headings) {
              doc_html[segment_filename] ~= top_level_heading;
            }
            auto t = xhtml_format.heading_seg(obj, suffix);
            doc_html[segment_filename] ~= to!string(t[0]);
            doc_html_endnotes[segment_filename] ~= t[1];
            break;
          case 5: .. case 7:
            auto t = xhtml_format.heading_seg(obj, suffix);
            doc_html[segment_filename] ~= to!string(t[0]);
            doc_html_endnotes[segment_filename] ~= t[1];
            break;
          case 8: .. case 9: // unused numbers, if remain check
            if ((doc_matters.opt_action_bool["debug"])) {
              writeln(__FILE__, ":", __LINE__, ": ", obj.is_a, ": ", obj.heading_lev_markup);
              writeln(__FILE__, ":", __LINE__, ": ", obj.text); // check
            }
            break;
          default:
            if ((doc_matters.opt_action_bool["debug"])) {
              writeln(__FILE__, ":", __LINE__, ": ", obj.is_a, ": ", obj.heading_lev_markup);
            }
            break;
          }
        } else {
          switch (obj.use) {
          case "frontmatter":
            switch (obj.is_of) {
            case "para":
              switch (obj.is_a) {
              case "toc":
                auto t = xhtml_format.para_seg(obj, suffix);
                doc_html[segment_filename] ~= to!string(t[0]);
                break;
              default:
                if ((doc_matters.opt_action_bool["debug"])) {
                  writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
                }
                break;
              }
              break;
            default:
              if ((doc_matters.opt_action_bool["debug"])) {
                writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
              }
              break;
            }
            break;
          case "body":
            switch (obj.is_of) {
            case "para":
              switch (obj.is_a) {
              case "para":
                auto t = xhtml_format.para_seg(obj, suffix);
                doc_html[segment_filename] ~= to!string(t[0]);
                doc_html_endnotes[segment_filename] ~= t[1];
                break;
              default:
                if ((doc_matters.opt_action_bool["debug"])) {
                  writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
                }
                break;
              }
              break;
            case "block":
              switch (obj.is_a) {
              case "poem":
                break;
              case "verse":
                doc_html[segment_filename] ~= xhtml_format.nugget(obj);
                break;
              case "group":
                doc_html[segment_filename] ~= xhtml_format.nugget(obj);
                break;
              case "block":
                doc_html[segment_filename] ~= xhtml_format.nugget(obj);
                break;
              case "quote":
                doc_html[segment_filename] ~= xhtml_format.nugget(obj);
                break;
              case "table":
                auto t = xhtml_format.para_seg(obj, suffix);
                doc_html[segment_filename] ~= t[0];
                doc_html_endnotes[segment_filename] ~= t[1];
                break;
              case "code":
                doc_html[segment_filename] ~= xhtml_format.code(obj);
                break;
              default:
                if ((doc_matters.opt_action_bool["debug"])) {
                  writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
                }
                break;
              }
              break;
            default:
              if ((doc_matters.opt_action_bool["debug"])) {
                writeln(__FILE__, ":", __LINE__, ": ", obj.is_of);
              }
              break;
            }
            break;
          case "backmatter":
            switch (obj.is_of) {
            case "para":
              switch (obj.is_a) {
              case "endnote":
                auto t = xhtml_format.para_seg(obj, suffix);
                doc_html[segment_filename] ~= t[0];
                break;
              case "glossary":
                auto t = xhtml_format.para_seg(obj, suffix);
                doc_html[segment_filename] ~= t[0];
                doc_html_endnotes[segment_filename] ~= t[1];
                break;
              case "bibliography":
                auto t = xhtml_format.para_seg(obj, suffix);
                doc_html[segment_filename] ~= t[0];
                doc_html_endnotes[segment_filename] ~= t[1];
                break;
              case "bookindex":
                auto t = xhtml_format.para_seg(obj, suffix);
                doc_html[segment_filename] ~= t[0];
                doc_html_endnotes[segment_filename] ~= t[1];
                break;
              case "blurb":
                auto t = xhtml_format.para_seg(obj, suffix);
                doc_html[segment_filename] ~= t[0];
                doc_html_endnotes[segment_filename] ~= t[1];
                break;
              default:
                if ((doc_matters.opt_action_bool["debug"])) {
                  writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
                }
                break;
              }
              break;
            default:
              if ((doc_matters.opt_action_bool["debug"])) {
                writeln(__FILE__, ":", __LINE__, ": ", obj.is_of);
              }
              break;
            }
            break;
          case "comment":
            break;
          default:
            if ((doc_matters.opt_action_bool["debug"])) {
              writeln(__FILE__, ":", __LINE__, ": ", obj.use);
            }
            break;
          }
        }
      }
    }
    seg_write_output(doc_matters, doc_html, doc_html_endnotes);
  }
  void seg_write_output(M,D,E)(
    M doc_matters,
    D doc_html,
    E doc_html_endnotes,
  ) {
    debug(asserts){
      static assert(is(typeof(doc_html)      == string[][string]));
    }
    mixin SiSUoutputRgxInit;
    auto rgx = Rgx();
    mixin SiSUpaths;
    auto pth_html = HtmlPaths();
    auto xhtml_format = outputXHTMLs();
    auto m = matchFirst(doc_matters.source_filename, rgx.src_fn);
    try {
      if (!exists(pth_html.seg(doc_matters.source_filename))) {
        mkdirRecurse(pth_html.seg(doc_matters.source_filename));
      }
      foreach (seg_filename; doc_matters.segnames) {
        auto f = File(pth_html.fn_seg(doc_matters.source_filename, seg_filename), "w");
        foreach (docseg; doc_html[seg_filename]) {
          f.writeln(docseg);
        }
        foreach (docseg; doc_html_endnotes[seg_filename]) {
          f.writeln(docseg);
        }
        f.writeln(xhtml_format.tail); // needed for each lev4
      }
    }
    catch (ErrnoException ex) {
      // handle error
    }
  }
  auto html_css() {
    string css;
    css="/* SiSU css default stylesheet */
    body {
      color: black;
      background: #ffffff;
      background-color: #ffffff;
    }
    a:link {
      color: #003399;
      text-decoration: none;
    }
    a:visited {
      color: #003399;
      text-decoration: none;
    }
    a:hover {
      color: #000000;
      background-color: #f9f9aa;
    }
    a.lnkocn:link {
      color: #777777;
      text-decoration: none;
    }
    a:hover img {
      background-color: #ffffff;
    }
    a:active {
      color: #003399;
      text-decoration: underline;
    }
    div {
      margin-left: 0;
      margin-right: 0;
    }
    div.p {
      margin-left: 5%;
      margin-right: 1%;
    }
    #top_band {
      position: absolute;
      top: 0;
      bottom: 80px;
      width: 100%;
    }
    #top_band_search {
      position: absolute;
      top: 0px;
      right: 0px;
      margin-left: 75%;
      width: 20%;
    }
    #column_left {
      position: absolute;
      top: 80px;
      left: 0;
      margin-left: 1%;
      width: 20%;
    }
    #column_center {
      position: absolute;
      top: 80px;
      margin-left: 20%;
      width: 55%;
    }
    #column_right {
      position: absolute;
      top: 80px;
      right: 0px;
      margin-left: 75%;
      width: 25%;
    }
    #pane_major {
      position: absolute;
      top: 0px;
      left: 0;
      margin-left: 0;
      width: 80%;
    }
    #pane_minor {
      position: absolute;
      top: 0px;
      right: 0px;
      margin-left: 75%;
      width: 20%;
      background-color: #aaaaaa;
    }
    .norm, .bold, .verse, .group, .block, .alt {
      line-height: 133%;
      margin-left: 0em;
      margin-right: 2em;
      margin-top: 12px;
      margin-bottom: 0px;
      padding-left: 0em;
      text-indent: 0em;
    }
    p, h0, h1, h2, h3, h4, h5, h6, h7 {
      display: block;
      font-family: verdana, arial, georgia, tahoma, sans-serif, helvetica, times, roman;
      font-size: 100%;
      font-weight: normal;
      line-height: 133%;
      text-align: justify;
      margin-left: 0em;
      margin-right: 2em;
      text-indent: 0mm;
      margin-top: 0.8em;
      margin-bottom: 0.8em;
    }
    /* indent */
    p.norm { }
    p.i1 {padding-left: 1em;}
    p.i2 {padding-left: 2em;}
    p.i3 {padding-left: 3em;}
    p.i4 {padding-left: 4em;}
    p.i5 {padding-left: 5em;}
    p.i6 {padding-left: 6em;}
    p.i7 {padding-left: 7em;}
    p.i8 {padding-left: 8em;}
    p.i9 {padding-left: 9em;}
    /* hanging indent */
    p[indent=\"h0i0\"] {
      padding-left: 0em;
      text-indent:  0em;
    }
    p[indent=\"h0i1\"] {
      padding-left: 1em;
      text-indent: -1em;
    }
    p[indent=\"h0i2\"] {
      padding-left: 2em;
      text-indent: -2em;
    }
    p[indent=\"h0i3\"] {
      padding-left: 3em;
      text-indent: -3em;
    }
    p[indent=\"h0i4\"] {
      padding-left: 4em;
      text-indent: -4em;
    }
    p[indent=\"h0i5\"] {
      padding-left: 5em;
      text-indent: -5em;
    }
    p[indent=\"h0i6\"] {
      padding-left: 6em;
      text-indent: -6em;
    }
    p[indent=\"h0i7\"] {
      padding-left: 7em;
      text-indent: -7em;
    }
    p[indent=\"h0i8\"] {
      padding-left: 8em;
      text-indent: -8em;
    }
    p[indent=\"h0i9\"] {
      padding-left: 9em;
      text-indent: -9em;
    }
    p[indent=\"h1i0\"] {
      padding-left: 0em;
      text-indent:  1em;
    }
    p[indent=\"h1i1\"] {
      padding-left: 1em;
      text-indent:  0em;
    }
    p[indent=\"h1i2\"] {
      padding-left: 2em;
      text-indent: -1em;
    }
    p[indent=\"h1i3\"] {
      padding-left: 3em;
      text-indent: -2em;
    }
    p[indent=\"h1i4\"] {
      padding-left: 4em;
      text-indent: -3em;
    }
    p[indent=\"h1i5\"] {
      padding-left: 5em;
      text-indent: -4em;
    }
    p[indent=\"h1i6\"] {
      padding-left: 6em;
      text-indent: -5em;
    }
    p[indent=\"h1i7\"] {
      padding-left: 7em;
      text-indent: -6em;
    }
    p[indent=\"h1i8\"] {
      padding-left: 8em;
      text-indent: -7em;
    }
    p[indent=\"h1i9\"] {
      padding-left: 9em;
      text-indent: -8em;
    }
    p[indent=\"h2i0\"] {
      padding-left: 0em;
      text-indent:  2em;
    }
    p[indent=\"h2i1\"] {
      padding-left: 1em;
      text-indent:  1em;
    }
    p[indent=\"h2i2\"] {
      padding-left: 2em;
      text-indent:  0em;
    }
    p[indent=\"h2i3\"] {
      padding-left: 3em;
      text-indent: -1em;
    }
    p[indent=\"h2i4\"] {
      padding-left: 4em;
      text-indent: -2em;
    }
    p[indent=\"h2i5\"] {
      padding-left: 5em;
      text-indent: -3em;
    }
    p[indent=\"h2i6\"] {
      padding-left: 6em;
      text-indent: -4em;
    }
    p[indent=\"h2i7\"] {
      padding-left: 7em;
      text-indent: -5em;
    }
    p[indent=\"h2i8\"] {
      padding-left: 8em;
      text-indent: -6em;
    }
    p[indent=\"h2i9\"] {
      padding-left: 9em;
      text-indent: -7em;
    }
    p[indent=\"h3i0\"] {
      padding-left: 0em;
      text-indent:  3em;
    }
    p[indent=\"h3i1\"] {
      padding-left: 1em;
      text-indent:  2em;
    }
    p[indent=\"h3i2\"] {
      padding-left: 2em;
      text-indent:  1em;
    }
    p[indent=\"h3i3\"] {
      padding-left: 3em;
      text-indent:  0em;
    }
    p[indent=\"h3i4\"] {
      padding-left: 4em;
      text-indent: -1em;
    }
    p[indent=\"h3i5\"] {
      padding-left: 5em;
      text-indent: -2em;
    }
    p[indent=\"h3i6\"] {
      padding-left: 6em;
      text-indent: -3em;
    }
    p[indent=\"h3i7\"] {
      padding-left: 7em;
      text-indent: -4em;
    }
    p[indent=\"h3i8\"] {
      padding-left: 8em;
      text-indent: -5em;
    }
    p[indent=\"h3i9\"] {
      padding-left: 9em;
      text-indent: -6em;
    }
    p[indent=\"h4i0\"] {
      padding-left: 0em;
      text-indent:  4em;
    }
    p[indent=\"h4i1\"] {
      padding-left: 1em;
      text-indent:  3em;
    }
    p[indent=\"h4i2\"] {
      padding-left: 2em;
      text-indent:  2em;
    }
    p[indent=\"h4i3\"] {
      padding-left: 3em;
      text-indent:  1em;
    }
    p[indent=\"h4i4\"] {
      padding-left: 4em;
      text-indent:  0em;
    }
    p[indent=\"h4i5\"] {
      padding-left: 5em;
      text-indent: -1em;
    }
    p[indent=\"h4i6\"] {
      padding-left: 6em;
      text-indent: -2em;
    }
    p[indent=\"h4i7\"] {
      padding-left: 7em;
      text-indent: -3em;
    }
    p[indent=\"h4i8\"] {
      padding-left: 8em;
      text-indent: -4em;
    }
    p[indent=\"h4i9\"] {
      padding-left: 9em;
      text-indent: -5em;
    }
    p[indent=\"h5i0\"] {
      padding-left: 0em;
      text-indent:  5em;
    }
    p[indent=\"h5i1\"] {
      padding-left: 1em;
      text-indent:  4em;
    }
    p[indent=\"h5i2\"] {
      padding-left: 2em;
      text-indent:  3em;
    }
    p[indent=\"h5i3\"] {
      padding-left: 3em;
      text-indent:  2em;
    }
    p[indent=\"h5i4\"] {
      padding-left: 4em;
      text-indent:  1em;
    }
    p[indent=\"h5i5\"] {
      padding-left: 5em;
      text-indent:  0em;
    }
    p[indent=\"h5i6\"] {
      padding-left: 6em;
      text-indent: -1em;
    }
    p[indent=\"h5i7\"] {
      padding-left: 7em;
      text-indent: -2em;
    }
    p[indent=\"h5i8\"] {
      padding-left: 8em;
      text-indent: -3em;
    }
    p[indent=\"h5i9\"] {
      padding-left: 9em;
      text-indent: -4em;
    }
    p[indent=\"h6i0\"] {
      padding-left: 0em;
      text-indent:  6em;
    }
    p[indent=\"h6i1\"] {
      padding-left: 1em;
      text-indent:  5em;
    }
    p[indent=\"h6i2\"] {
      padding-left: 2em;
      text-indent:  4em;
    }
    p[indent=\"h6i3\"] {
      padding-left: 3em;
      text-indent:  3em;
    }
    p[indent=\"h6i4\"] {
      padding-left: 4em;
      text-indent:  2em;
    }
    p[indent=\"h6i5\"] {
      padding-left: 5em;
      text-indent:  1em;
    }
    p[indent=\"h6i6\"] {
      padding-left: 6em;
      text-indent:  0em;
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      padding-left: 9em;
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      padding-left: 0em;
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    }
    p[indent=\"h7i1\"] {
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      text-indent:  5em;
    }
    p[indent=\"h7i3\"] {
      padding-left: 3em;
      text-indent:  4em;
    }
    p[indent=\"h7i4\"] {
      padding-left: 4em;
      text-indent:  3em;
    }
    p[indent=\"h7i5\"] {
      padding-left: 5em;
      text-indent:  2em;
    }
    p[indent=\"h7i6\"] {
      padding-left: 6em;
      text-indent:  1em;
    }
    p[indent=\"h7i7\"] {
      padding-left: 7em;
      text-indent:  0em;
    }
    p[indent=\"h7i8\"] {
      padding-left: 8em;
      text-indent: -1em;
    }
    p[indent=\"h7i9\"] {
      padding-left: 9em;
      text-indent: -2em;
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    p[indent=\"h8i0\"] {
      padding-left: 0em;
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    p[indent=\"h8i1\"] {
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    p[indent=\"h8i2\"] {
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    p[indent=\"h8i3\"] {
      padding-left: 3em;
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    }
    p[indent=\"h8i4\"] {
      padding-left: 4em;
      text-indent:  4em;
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    p[indent=\"h8i5\"] {
      padding-left: 5em;
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    p[indent=\"h8i6\"] {
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    p[indent=\"h8i7\"] {
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      padding-left: 8em;
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    p[indent=\"h8i9\"] {
      padding-left: 9em;
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    p[indent=\"h9i3\"] {
      padding-left: 3em;
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    p[indent=\"h9i4\"] {
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      padding-left: 5em;
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    p[indent=\"h9i8\"] {
      padding-left: 8em;
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    p[indent=\"h9i9\"] {
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      text-indent:  0em;
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      margin-left: 0em;
      margin-top: 6px;
      margin-bottom: 0px;
      line-height: 100%;
    }
    p.it1 {
      margin-left: 1em;
      margin-top: 0px;
      margin-bottom: 0px;
      line-height: 100%;
    }
    p.it2 {
      margin-left: 2em;
      margin-top: 0px;
      margin-bottom: 0px;
      line-height: 100%;
    }
    p.it3 {
      margin-left: 3em;
      margin-top: 0px;
      margin-bottom: 0px;
      line-height: 100%;
    }
    p.it4 {
      margin-left: 4em;
      margin-top: 0px;
      margin-bottom: 0px;
      line-height: 100%;
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    p.it5 {
      margin-left: 5em;
      margin-top: 0px;
      margin-bottom: 0px;
      line-height: 100%;
    }
    p.it6 {
      margin-left: 6em;
      margin-top: 0px;
      margin-bottom: 0px;
      line-height: 100%;
    }
    p.it7 {
      margin-left: 7em;
      margin-top: 0px;
      margin-bottom: 0px;
      line-height: 100%;
    }
    p.it8 {
      margin-left: 8em;
      margin-top: 0px;
      margin-bottom: 0px;
      line-height: 100%;
    }
    p.it9 {
      margin-left: 9em;
      margin-bottom: 0px;
      margin-top: 0px;
      line-height: 100%;
    }
    p.block { }
    p.group { }
    p.alt { }
    p.verse {
      margin-bottom: 6px;
    }
    p.code {
      font-family: inconsolata, andale mono, courier new, courier, monospace;
      font-size: 90%;
      text-align: left;
      background-color: #eeeeee;
    }
    p.caption {
      text-align: left;
      font-size: 80%;
      display: inline;
    }
    p.endnote {
      font-size: 96%;
      line-height: 120%;
      text-align: left;
      margin-right: 15mm;
    }
    p.endnote_indent {
      font-size: 96%;
      line-height: 120%;
      text-align: left;
      margin-left: 2em;
      margin-right: 15mm;
    }
    p.center {
      text-align: center;
    }
    p.bold {
      font-weight: bold;
    }
    p.bold_left {
      font-weight: bold;
      text-align: left;
    }
    p.centerbold {
      text-align: center;
      font-weight: bold;
    }
    p.em {
      font-weight: bold;
      font-style: normal;
      background: #fff3b6;
    }
    p.small {
      font-size: 80%;
      margin-top: 0px;
      margin-bottom: 0px;
      margin-right: 6px;
      text-align: left;
    }
    .tiny, .tiny_left, .tiny_right, .tiny_center {
      font-size: 10px;
      margin-top: 0px;
      margin-bottom: 0px;
      color: #777777;
      margin-right: 6px;
      text-align: left;
    }
    p.tiny { }
    p.tiny_left {
      margin-left: 0px;
      margin-right: 0px;
      text-align: left;
    }
    p.tiny_right {
      margin-right: 1em;
      text-align: right;
    }
    p.tiny_center {
      margin-left: 0px;
      margin-right: 0px;
      text-align: center;
    }
    p.pane, p.pane_title, p.pane_blurb, p.pane_link, p.pane_indent {
      font-size: 80%;
      margin-top: 0px;
      margin-bottom: 0px;
      margin-left: 2mm;
      margin-right: 4px;
      text-align: left;
    }
    p.pane { }
    p.pane_title {
      font-weight: bold;
      margin-bottom: 0px;
    }
    p.pane_blurb {
      font-size: 10px;
      margin-bottom: 0px;
    }
    p.pane_link {
      font-size: 10px;
      margin-bottom: 0px;
      margin-left: 4mm;
    }
    p.pane_indent {
      font-size: 10px;
      margin-bottom: 0px;
      margin-left: 4mm;
    }
    p.concordance_word {
      line-height: 150%;
      font-weight: bold;
      display: inline;
      margin-top: 4px;
      margin-bottom: 1px;
    }
    p.concordance_count {
      font-size: 80%;
      color: #777777;
      display: inline;
      margin-left: 0em;
    }
    p.concordance_object {
      font-size: 80%;
      line-height: 120%;
      text-align: left;
      margin-left: 3em;
      margin-top: 1px;
      margin-bottom: 3px;
    }
    p.book_index_lev1 {
      line-height: 100%;
      margin-top: 4px;
      margin-bottom: 1px;
    }
    p.book_index_lev2 {
      line-height: 100%;
      text-align: left;
      margin-left: 3em;
      margin-top: 1px;
      margin-bottom: 3px;
    }
    p.quickref {
      font-size: 10px;
      font-style: italic;
      margin-top: 0px;
      margin-bottom: 0px;
      color: #777777;
      margin-right: 5px;
      text-align: left;
    }
    p.bigref {
      font-size: 11px;
      font-weight: bold;
      margin-top: 0px;
      margin-bottom: 0px;
      color: #777777;
      margin-right: 5px;
      text-align: center;
    }
    p.letter {
      font-weight: bold;
      font-size: 80%;
      margin-left: 0em;
      margin-top: 2px;
      margin-bottom: 2px;
      margin-right: 6px;
      text-align: left;
      color: white;
      background: #880000;
    }
    tt {
      font-family: inconsolata, andale mono, courier new, courier, monospace;
      background-color: #eeeeee;
    }
    label.ocn {
      width: 2%;
      float: right;
      top: 0;
      font-size: 10px;
      margin-top: 0px;
      margin-bottom: 5px;
      color: #777777;
      margin-right: 5px;
      text-align: right;
      background-color: #ffffff;
    }
    table { }
    tr { }
    th,td {
      vertical-align: top;
      text-align: left;
    }
    th {
      font-weight: bold;
    }
    p.left,th.left,td.left {
      text-align: left;
    }
    p.small_left,th.small_left,td.small_left {
      text-align: left;
      font-size: 80%;
    }
    p.right,th.right,td.right {
      text-align: right;
    }
    #horizontal_links {
      background: #eeeeee;
      margin-left: 5%;
      margin-right: 5%;
    }
    #horizontal {
      margin: 0;
      padding: 0 0 0 10px;
      border-top: 1px solid #000077;
      border-bottom: 1px solid #000077;
    }
    #horizontal li {
      margin: 0 0 0 0;
      padding: 0 16px 0 0;
      display: inline;
      list-style-type: none;
      text-align: left;
      background: none;
    }
    #horizontal a {
      line-height: 12px;
      margin: 0 0 0 0;
      text-decoration: none;
      color: #000077;
    }
    #horizontal a.active, #horizontal a:hover {
      border-bottom: 2px solid #777777;
      padding-bottom: 2px;
      color: #000077;
    }
    #horizontal a:hover {
      color: #000077;
    }
    #document_versions {
      position: absolute;
      top: 10mm;
      right: 2%;
      width: 12%;
      float: right;
    }
    #vertical_links {
      position: absolute;
      top: 10mm;
      right: 0px;
      width: 20%;
      background: #dddddd;
      float: right;
    }
    #vertical {
      padding: 0 12px 0px 0px;
      margin-left: 2%;
      margin-right: 2%;
    }
    #vertical li {
      display: block;
      list-style-type: none;
    }
    #vertical a {
      line-height: 12px;
      text-decoration: none;
      color: #000077;
    }
    #vertical a.active, #vertical a:hover {
      border-bottom: 2px solid #777777;
      padding-bottom: 2px;
      color: #000077;
    }
    ul, li {
      list-style-type: none;
      list-style: none;
      padding-left: 20px;
      display: block;
      font-family: verdana, arial, georgia, tahoma, sans-serif, helvetica, times, roman;
      font-weight: normal;
      line-height: 150%;
      text-align: left;
      text-indent: 0mm;
      margin-left: 1em;
      margin-right: 2em;
      margin-top: 3px;
      margin-bottom: 3px;
    }
    li {
      background: url(../image_sys/bullet_09.png) no-repeat 0px 6px;
    }
    ul {
    }
    li.bullet { margin-left: 1em; }
    li.i1 { margin-left: 2em; }
    li.i2 { margin-left: 3em; }
    li.i3 { margin-left: 4em; }
    li.i4 { margin-left: 5em; }
    li.i5 { margin-left: 6em; }
    li.i6 { margin-left: 7em; }
    li.i7 { margin-left: 8em; }
    li.i8 { margin-left: 9em; }
    li.i9 { margin-left: 10em; }
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      margin-top: 0px;
      margin-bottom: 0px;
      margin-right: 0px;
      font-size: 8px;
      font-style: normal;
      text-align: left;
    }
    li.doc {
      background: url(../image_sys/bullet_09.png) no-repeat 0px 6px;
      padding-left: 16px;
      margin-left: 10px;
      margin-right: 0px;
    }
    li.ref {
      background: none;
      padding-left: 0;
      margin-left: 0;
      color: #777777;
    }
    li.refcenter {
      background: url(../image_sys/bullet_09.png) no-repeat 0px 6px;
      padding-left: 20px;
      margin-left: 10%;
      font-size: 9px;
      color: #777777;
      text-align: center;
    }
    li.refbold {
      list-style-type: none;
      padding-left: 16px;
      margin-left: 0;
      margin-right: 10mm;
      font-weight: bold;
    }
    h0, h1, h2, h3, h4, h5, h6, h7 {
      font-weight: bold;
      line-height: 120%;
      text-align: left;
      margin-top: 20px;
      margin-bottom: 10px;
    }
    h4.norm, h5.norm, h6.norm, h7.norm {
      margin-top: 10px;
      margin-bottom: 0px;
    }
    h0.center, h1.center, h2.center, h3.center, h4.center, h5.center, h6.center, h7.center {
      text-align: center;
    }
    h0 { font-size: 125%; }
    h1 { font-size: 120%; }
    h2 { font-size: 115%; }
    h3 { font-size: 110%; }
    h4 { font-size: 105%; }
    h5 { font-size: 100%; }
    h6 { font-size: 100%; }
    h7 { font-size: 100%; }
    h1.i {margin-left: 2em;}
    h2.i {margin-left: 3em;}
    h3.i {margin-left: 4em;}
    h4.i {margin-left: 5em;}
    h5.i {margin-left: 6em;}
    h6.i {margin-left: 7em;}
    h7.i {margin-left: 8em;}
    h8.i {margin-left: 9em;}
    h9.i {margin-left: 10em;}
    h1.top_band {
      display: inline;
      text-align: left;
      margin-top: 0;
      margin-left: 4mm;
      text-indent: 0mm;
      font-weight: bold;
      font-size: 120%;
    }
    h2.top_band_tiny {
      font-size: 10px;
      font-weight: normal;
      margin-top: 0px;
      margin-left: 4mm;
      text-indent: 0mm;
      margin-bottom: 0px;
      color: #777777;
      margin-left: 140px;
      margin-right: 0px;
      text-align: left;
    }
    p.top_band {
      display: inline;
      text-align: left;
      margin-top: 0;
      margin-left: 140px;
      text-indent: 0mm;
      font-weight: bold;
      font-size: 120%;
    }
    p.top_band_tiny {
      font-size: 10px;
      margin-top: 0px;
      margin-bottom: 0px;
      color: #777777;
      margin-left: 140px;
      margin-right: 0px;
      text-align: left;
    }
    p.top_band_image {
      float: left;
      display: inline;
      text-align: left;
      margin-top: 0;
      margin-left: 1mm;
      text-indent: 0mm;
      margin-right: 1mm;
    }
    .banner, .subbanner {
      font-weight: bold;
      text-align: center;
      margin-left: 10mm;
      margin-right: 15mm;
      margin-top: 20px;
      margin-bottom: 10px;
    }
    h0.banner {
      font-size: 125%;
    }
    h1.banner {
      font-size: 120%;
    }
    h1.subbanner {
      font-size: 115%;
    }
    h2.banner {
      font-size: 110%;
    }
    h3.banner {
      color: #990000;
      font-size: 105%;
    }
    h4.banner {
      color: #ff0000;
      font-size: 100%;
    }
    h5.banner {
    }
    h6.banner {
    }
    h7.banner {
    }
    .toc {
      font-weight: normal;
      margin-top: 6px;
      margin-bottom: 6px;
    }
    h0.toc {
      margin-left: 1em;
      font-size: 120%;
      line-height: 150%;
    }
    h1.toc {
      margin-left: 1em;
      font-size: 115%;
      line-height: 150%;
    }
    h2.toc {
      margin-left: 2em;
      font-size: 110%;
      line-height: 140%;
    }
    h3.toc {
      margin-left: 3em;
      font-size: 105%;
      line-height: 120%;
    }
    h4.toc {
      margin-left: 4em;
      font-size: 100%;
      line-height: 120%;
    }
    h5.toc {
      margin-left: 5em;
      font-size: 95%;
      line-height: 110%;
    }
    h6.toc {
      margin-left: 6em;
      font-size: 90%;
      line-height: 110%;
    }
    h7.toc {
      margin-left: 7em;
      font-size: 85%;
      line-height: 100%;
    }
    .microtoc {
      margin-top: 2px;
      margin-bottom: 2px;
    }
    h0.microtoc {
      margin-left: 0mm;
      font-size: 120%;
    }
    h1.microtoc {
      margin-left: 0mm;
      font-size: 115%;
    }
    h2.microtoc {
      margin-left: 5mm;
      font-size: 110%;
    }
    h3.microtoc {
      margin-left: 10mm;
      font-size: 105%;
    }
    h4.microtoc {
      margin-left: 15mm;
      font-weight: normal;
      font-size: 100%;
    }
    h5.microtoc {
      margin-left: 20mm;
      font-weight: normal;
      font-size: 95%;
    }
    h6.microtoc {
      margin-left: 25mm;
      font-weight: normal;
      font-size: 90%;
    }
    h7.microtoc {
      margin-left: 30mm;
      font-weight: normal;
      font-size: 85%;
    }
    .subtoc {
      margin-right: 34%;
      font-weight: normal;
    }
    h5.subtoc {
      margin-left: 2em;
      font-size: 80%;
      margin-top: 2px;
      margin-bottom: 2px;
    }
    h6.subtoc {
      margin-left: 3em;
      font-size: 75%;
      margin-top: 0px;
      margin-bottom: 0px;
    }
    h7.subtoc {
      margin-left: 4em;
      font-size: 70%;
      margin-top: 0px;
      margin-bottom: 0px;
    }
    div.substance {
      width: 100%;
      background-color: #ffffff;
    }
    div.ocn {
      width: 5%;
      float: right;
      top: 0;
      background-color: #ffffff;
    }
    div.endnote {
      width: 95%;
      background-color: #fffffff;
    }
    div.toc {
      position: absolute;
      float: left;
      margin: 0;
      padding: 0;
      padding-top: 0.5em;
      border: 0;
      width: 13em;
      background-color: #eeeeee;
      margin-right:1em;
    }
    div.summary {
      margin: 0;
      padding: 0;
      border-left: 13em solid #eeeeee;
      padding-left: 1em;
      background-color: #eeeeee;
    }
    div.content, div.main_column {
      margin: 0;
      padding: 0;
      border-left: 13em solid #ffffff;
      padding-left: 1em;
      padding-right: 1em;
    }
    div.content0, div.main_column0 {
      margin: 0;
      padding: 0;
      border-left: 0% solid #ffffff;
      padding-left: 5%;
    }
    div.scroll {
      margin: 0;
      padding: 0;
      padding-left: 1em;
      padding-right: 1em;
    }
    div.content:after {
      content:' ';
      clear:both;
      display:block;
      height:0;
      overflow:hidden
    }
    div.footer {
      clear:left;
      padding: 0.5em;
      font-size: 80%;
      margin: 0;
    }
    div.toc ul {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    div.toc li ul a, li ul span.currentlink
    {
      font-weight: normal;
      font-size: 90%;
      padding-left: 2em;
      background-color: #eeeeee;
    }
    div.toc a, span.currentlink{
      display:block;
      text-decoration: none;
      padding-left: 0.5em;
      color: #0000aa;
    }
    hr {
      width: 90%;
    }
    span.currentlink {
      text-decoration: none;
      background-color: #aaaaf9;
    }
    div.toc a:visited {
      color: #0000aa;
    }
    div.toc a:hover {
      color: #000000;
      background-color: #f9f9aa;
    }
    .minitoc {
      font-weight: normal;
      margin-top: 2px;
      margin-bottom: 2px;
    }
    h1.minitoc, h2.minitoc, h3.minitoc {
      margin-left: 0em;
      font-weight: bold;
      text-align: left;
      font-size: 90%;
      margin-top: 4px;
      margin-bottom: 4px;
    }
    h4.minitoc {
      margin-left: 0em;
      font-size: 90%;
    }
    h5.minitoc {
      margin-left: 1em;
      font-size: 85%;
    }
    h6.minitoc {
      margin-left: 2em;
      font-size: 85%;
    }
    h7.minitoc {
      margin-left: 3em;
      font-size: 80%;
    }
    h0.minitoc {
      margin-left: 0em;
      font-size: 90%;
    }
    h0.c, h1.c, h2.c, h3.c, h4.c, h5.c, h6.c, h7.c, p.c {
      text-align: center
    }
    h1.red, h2.red, h3.red, h4.red, h5.red, h6.red, h7.red {
      text-align: center;
      color: #ff0000;
      margin-left: 5mm;
      text-indent: 5mm;
      margin-top: 30px;
      margin-bottom: 20px;
      margin-right: 15mm;
    }
    h1.ruby, h2.ruby, h3.ruby, h4.ruby, h5.ruby, h6.ruby, h7.ruby {
      text-align: center;
      color: #990000;
      margin-left: 5mm;
      text-indent: 5mm;
      margin-top: 30px;
      margin-bottom: 20px;
      margin-right: 15mm;
    }";
    return css;
  }
  auto css_write() {
    auto pth_css= "_sisu/css";
    auto pth_css_fn= pth_css ~ "/html.css";
    try {
      if (!exists(pth_css)) {
        mkdirRecurse(pth_css);
      }
      auto f = File(pth_css_fn, "w");
      f.writeln(html_css);
      // foreach (o; doc) {
      //   f.writeln(o);
      // }
    }
    catch (ErrnoException ex) {
      // Handle error
    }
  }
}