diff -r 2cb7fdd2ba18 -r 7e099403e5b0 src/html.cpp
--- a/src/html.cpp	Mon May 19 13:30:18 2025 +0200
+++ b/src/html.cpp	Mon May 19 13:58:19 2025 +0200
@@ -134,9 +134,21 @@
     }
 }
 
+void html::chart_begin(const std::string& repo, const std::string& author) {
+    indent();
+    printf("<div class=\"chart\" data-repo=\"%s\" data-author=\"%s\">\n",
+        encode(repo).c_str(), encode(author).c_str());
+    indentation++;
+}
+
+void html::chart_end() {
+    indent(-1);
+    puts("</div>");
+}
+
 void html::heading_repo(const std::string& repo) {
     indent();
-    printf("<h1>%s</h1>\n", encode(repo).c_str());
+    printf("<h1 data-repo=\"%s\">%1$s</h1>\n", encode(repo).c_str());
 }
 
 void html::heading_author(const std::string& author, unsigned int total_commits) {
@@ -179,8 +191,7 @@
 }
 
 void html::table_end() {
-    indentation--;
-    indent();
+    indent(-1);
     puts("</table>");
 }