diff --git a/bin/README.md b/bin/README.md
index 1bdc25a20..071040c20 100644
--- a/bin/README.md
+++ b/bin/README.md
@@ -527,16 +527,17 @@ The following HTML phase files are used to build HTML content:
 0. inc/top.default.html
 1. inc/head.default.html
 2. inc/body.default.html
-3. inc/header.default.html
-4. inc/navbar.default.html
-5. inc/begin-row.default.html
-6. inc/begin-leftcolumn.default.html
-7. inc/sidenav.default.html
-8. inc/end-leftcolumn.default.html
-9. inc/begin-rightcolumn.default.html
-10. inc/before-content.default.html
+3. inc/topbar.default.html
+4. inc/header.default.html
+5. inc/navbar.default.html
+6. inc/begin-row.default.html
+7. inc/begin-leftcolumn.default.html
+8. inc/sidenav.default.html
+9. inc/end-leftcolumn.default.html
+10. inc/begin-rightcolumn.default.html
+11. inc/before-content.default.html
 
-Phases 11-19 are reserved for future use.
+Phases 12-19 are reserved for future use.
 
 20. ((insert 'before tool' output))
 21. ((insert 'pandoc wrapper tool' output))
diff --git a/bin/index.html b/bin/index.html
index c69c1a066..4be39d1be 100644
--- a/bin/index.html
+++ b/bin/index.html
@@ -359,6 +359,7 @@ HTML phases
 <li>inc/top.default.html</li>
 <li>inc/head.default.html</li>
 <li>inc/body.default.html</li>
+<li>inc/topbar.default.html</li>
 <li>inc/header.default.html</li>
 <li>inc/navbar.default.html</li>
 <li>inc/begin-row.default.html</li>
@@ -368,7 +369,7 @@ HTML phases
 <li>inc/begin-rightcolumn.default.html</li>
 <li>inc/before-content.default.html</li>
 </ol>
-<p>Phases 11-19 are reserved for future use.</p>
+<p>Phases 12-19 are reserved for future use.</p>
 <ol start="20" type="1">
 <li>((insert ‘before tool’ output))</li>
 <li>((insert ‘pandoc wrapper tool’ output))</li>
diff --git a/bin/md2html.sh b/bin/md2html.sh
index 7dbf009c0..25e847138 100755
--- a/bin/md2html.sh
+++ b/bin/md2html.sh
@@ -327,7 +327,7 @@ function global_variable_setup
     #
     unset PHASE_NAME
     declare -ag PHASE_NAME
-    PHASE_NAME=(top head body header navbar begin-row begin-leftcolumn
+    PHASE_NAME=(top head body topbar header navbar begin-row begin-leftcolumn
 	        sidenav end-leftcolumn end-leftcolumn begin-rightcolumn before-content
 		after-content end-rightcolumn end-row footer bottom)
     unset HTML_PHASE_NAME
@@ -1848,14 +1848,14 @@ if [[ $status -ne 0 ]]; then
     exit "$status"
 fi
 
-##########################################
-# HTML phase 3: inc/header.__name__.html #
-##########################################
+########################################
+# HTML phase 3: inc/topbar.__name__.html #
+########################################
 
 # NOTE: See inc/md2html.cfg for details on HTML phase numbers, HTML phase names, and HTML phase files
 #
 CUR_PHASE_NUM=3
-CUR_PHASE_NAME="header"
+CUR_PHASE_NAME="topbar"
 BASE_EXIT_CODE=55	# possible: exit 55 or exit 56 or exit 57 or exit 58 or exit 59
 #
 append_html_phase "$CUR_PHASE_NUM" "$CUR_PHASE_NAME" "$BASE_EXIT_CODE" "$TMP_SED_SCRIPT" "$TMP_PHASE" "$TMP_INDEX_HTML"
@@ -1868,13 +1868,13 @@ if [[ $status -ne 0 ]]; then
 fi
 
 ##########################################
-# HTML phase 4: inc/navbar.__name__.html #
+# HTML phase 4: inc/header.__name__.html #
 ##########################################
 
 # NOTE: See inc/md2html.cfg for details on HTML phase numbers, HTML phase names, and HTML phase files
 #
 CUR_PHASE_NUM=4
-CUR_PHASE_NAME="navbar"
+CUR_PHASE_NAME="header"
 BASE_EXIT_CODE=60	# possible: exit 60 or exit 61 or exit 62 or exit 63 or exit 64
 #
 append_html_phase "$CUR_PHASE_NUM" "$CUR_PHASE_NAME" "$BASE_EXIT_CODE" "$TMP_SED_SCRIPT" "$TMP_PHASE" "$TMP_INDEX_HTML"
@@ -1886,14 +1886,14 @@ if [[ $status -ne 0 ]]; then
     exit "$status"
 fi
 
-#############################################
-# HTML phase 5: inc/begin-row.__name__.html #
-#############################################
+##########################################
+# HTML phase 5: inc/navbar.__name__.html #
+##########################################
 
 # NOTE: See inc/md2html.cfg for details on HTML phase numbers, HTML phase names, and HTML phase files
 #
 CUR_PHASE_NUM=5
-CUR_PHASE_NAME="begin-row"
+CUR_PHASE_NAME="navbar"
 BASE_EXIT_CODE=65	# possible: exit 65 or exit 66 or exit 67 or exit 68 or exit 69
 #
 append_html_phase "$CUR_PHASE_NUM" "$CUR_PHASE_NAME" "$BASE_EXIT_CODE" "$TMP_SED_SCRIPT" "$TMP_PHASE" "$TMP_INDEX_HTML"
@@ -1905,14 +1905,14 @@ if [[ $status -ne 0 ]]; then
     exit "$status"
 fi
 
-####################################################
-# HTML phase 6: inc/begin-leftcolumn.__name__.html #
-####################################################
+#############################################
+# HTML phase 6: inc/begin-row.__name__.html #
+#############################################
 
 # NOTE: See inc/md2html.cfg for details on HTML phase numbers, HTML phase names, and HTML phase files
 #
 CUR_PHASE_NUM=6
-CUR_PHASE_NAME="begin-leftcolumn"
+CUR_PHASE_NAME="begin-row"
 BASE_EXIT_CODE=70	# possible: exit 70 or exit 71 or exit 72 or exit 73 or exit 74
 #
 append_html_phase "$CUR_PHASE_NUM" "$CUR_PHASE_NAME" "$BASE_EXIT_CODE" "$TMP_SED_SCRIPT" "$TMP_PHASE" "$TMP_INDEX_HTML"
@@ -1924,14 +1924,14 @@ if [[ $status -ne 0 ]]; then
     exit "$status"
 fi
 
-###########################################
-# HTML phase 7: inc/sidenav.__name__.html #
-###########################################
+####################################################
+# HTML phase 7: inc/begin-leftcolumn.__name__.html #
+####################################################
 
 # NOTE: See inc/md2html.cfg for details on HTML phase numbers, HTML phase names, and HTML phase files
 #
 CUR_PHASE_NUM=7
-CUR_PHASE_NAME="sidenav"
+CUR_PHASE_NAME="begin-leftcolumn"
 BASE_EXIT_CODE=75	# possible: exit 75 or exit 76 or exit 77 or exit 78 or exit 79
 #
 append_html_phase "$CUR_PHASE_NUM" "$CUR_PHASE_NAME" "$BASE_EXIT_CODE" "$TMP_SED_SCRIPT" "$TMP_PHASE" "$TMP_INDEX_HTML"
@@ -1943,14 +1943,14 @@ if [[ $status -ne 0 ]]; then
     exit "$status"
 fi
 
-##################################################
-# HTML phase 8: inc/end-leftcolumn.__name__.html #
-##################################################
+###########################################
+# HTML phase 8: inc/sidenav.__name__.html #
+###########################################
 
 # NOTE: See inc/md2html.cfg for details on HTML phase numbers, HTML phase names, and HTML phase files
 #
 CUR_PHASE_NUM=8
-CUR_PHASE_NAME="end-leftcolumn"
+CUR_PHASE_NAME="sidenav"
 BASE_EXIT_CODE=80	# possible: exit 80 or exit 81 or exit 82 or exit 83 or exit 84
 #
 append_html_phase "$CUR_PHASE_NUM" "$CUR_PHASE_NAME" "$BASE_EXIT_CODE" "$TMP_SED_SCRIPT" "$TMP_PHASE" "$TMP_INDEX_HTML"
@@ -1962,14 +1962,14 @@ if [[ $status -ne 0 ]]; then
     exit "$status"
 fi
 
-#####################################################
-# HTML phase 9: inc/begin-rightcolumn.__name__.html #
-#####################################################
+##################################################
+# HTML phase 9: inc/end-leftcolumn.__name__.html #
+##################################################
 
 # NOTE: See inc/md2html.cfg for details on HTML phase numbers, HTML phase names, and HTML phase files
 #
 CUR_PHASE_NUM=9
-CUR_PHASE_NAME="begin-rightcolumn"
+CUR_PHASE_NAME="end-leftcolumn"
 BASE_EXIT_CODE=85	# possible: exit 85 or exit 86 or exit 87 or exit 88 or exit 89
 #
 append_html_phase "$CUR_PHASE_NUM" "$CUR_PHASE_NAME" "$BASE_EXIT_CODE" "$TMP_SED_SCRIPT" "$TMP_PHASE" "$TMP_INDEX_HTML"
@@ -1981,15 +1981,34 @@ if [[ $status -ne 0 ]]; then
     exit "$status"
 fi
 
+#####################################################
+# HTML phase 10: inc/begin-rightcolumn.__name__.html #
+#####################################################
+
+# NOTE: See inc/md2html.cfg for details on HTML phase numbers, HTML phase names, and HTML phase files
+#
+CUR_PHASE_NUM=9
+CUR_PHASE_NAME="begin-rightcolumn"
+BASE_EXIT_CODE=90	# possible: exit 85 or exit 91 or exit 92 or exit 93 or exit 94
+#
+append_html_phase "$CUR_PHASE_NUM" "$CUR_PHASE_NAME" "$BASE_EXIT_CODE" "$TMP_SED_SCRIPT" "$TMP_PHASE" "$TMP_INDEX_HTML"
+status="$?"
+if [[ $status -ne 0 ]]; then
+    echo "$0: ERROR: append_html_phase" \
+         "$CUR_PHASE_NUM $CUR_PHASE_NAME $BASE_EXIT_CODE $TMP_SED_SCRIPT $TMP_PHASE $TMP_INDEX_HTML," \
+	 "error code: $status" 1>&2
+    exit "$status"
+fi
+
 ###################################################
-# HTML phase 10: inc/before-content.__name__.html #
+# HTML phase 11: inc/before-content.__name__.html #
 ###################################################
 
 # NOTE: See inc/md2html.cfg for details on HTML phase numbers, HTML phase names, and HTML phase files
 #
-CUR_PHASE_NUM=10
+CUR_PHASE_NUM=11
 CUR_PHASE_NAME="before-content"
-BASE_EXIT_CODE=90	# possible: exit 90 or exit 91 or exit 92 or exit 93 or exit 94
+BASE_EXIT_CODE=95	# possible: exit 95 or exit 96 or exit 97 or exit 98 or exit 99
 #
 append_html_phase "$CUR_PHASE_NUM" "$CUR_PHASE_NAME" "$BASE_EXIT_CODE" "$TMP_SED_SCRIPT" "$TMP_PHASE" "$TMP_INDEX_HTML"
 status="$?"
diff --git a/inc/topbar.default.html b/inc/topbar.default.html
new file mode 100644
index 000000000..41da1fdad
--- /dev/null
+++ b/inc/topbar.default.html
@@ -0,0 +1,3 @@
+<!-- START: this line starts content from: inc/topbar.default.html -->
+
+<!-- END: this line ends content from: inc/topbar.default.html -->
diff --git a/sitemap.xml b/sitemap.xml
index d23b9de16..442ae539c 100644
--- a/sitemap.xml
+++ b/sitemap.xml
@@ -19110,7 +19110,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/bin/index.html</loc>
-    <lastmod>2024-04-16T19:14:55+00:00</lastmod>
+    <lastmod>2024-04-16T19:33:01+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/bin/manifest.entry.json.awk</loc>
@@ -19118,7 +19118,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/bin/md2html.sh</loc>
-    <lastmod>2024-04-16T19:14:55+00:00</lastmod>
+    <lastmod>2024-04-16T19:32:18+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/bin/output-index-author.sh</loc>
@@ -19146,7 +19146,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/bin/README.md</loc>
-    <lastmod>2024-04-16T19:14:55+00:00</lastmod>
+    <lastmod>2024-04-16T19:29:35+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/bin/sgi.sh</loc>
@@ -19380,6 +19380,10 @@
     <loc>https://ioccc-src.github.io/temp-test-ioccc/inc/sidenav.default.html</loc>
     <lastmod>2024-04-16T19:14:55+00:00</lastmod>
 </url>
+<url>
+    <loc>https://ioccc-src.github.io/temp-test-ioccc/inc/topbar.default.html</loc>
+    <lastmod>2024-04-16T19:26:26+00:00</lastmod>
+</url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/inc/top.default.html</loc>
     <lastmod>2024-04-16T19:14:55+00:00</lastmod>