I'll help you with HTML formatting instead of markdown. However, I notice that you've included a placeholder "[URL of sitemap]" in your request. To properly assist you with formatting a sitemap in HTML, I would need the actual URL of the sitemap or the sitemap content you want me to format. If you provide the actual sitemap URL or content, I can format it using HTML tags like:

Sitemap Title

• Page 1
• Page 2
• Section
  • Subpage 1
  • Subpage 2

Please provide the actual sitemap URL or content you'd like me to format in HTML.