--- a/src/html.h	Mon May 19 15:34:30 2025 +0200
+++ b/src/html.h	Mon May 19 16:05:58 2025 +0200
@@ -31,9 +31,11 @@
 
 namespace html {
 
+    static constexpr unsigned max_indentation = 16;
+    static constexpr unsigned max_external_indentation = max_indentation - 4;
     static constexpr unsigned columns = 53;
 
-    void open(bool fragment);
+    void open(bool fragment, unsigned char fragment_indent = 0);
     void close(bool fragment);
 
     void chart_begin(const std::string& repo, const std::string& author);