My HTML code isn't displaying correctly in my Blogspot post. What are common reasons and how can I troubleshoot it?

Common reasons for HTML not displaying correctly include: 1. Blogspot's automatic sanitization removing or modifying tags (especially `script` or complex CSS). 2. Special characters being unescaped (e.g., using `&` instead of `&`). 3. Errors in the HTML itself. To troubleshoot: always paste code in 'HTML view'. If it disappears or is modified, Blogspot is sanitizing it. For script tags, consider using an 'HTML/JavaScript' gadget instead, or if embedding, ensure you're using the service's official embed code. For simple text with HTML, ensure all tags are properly closed. Test small snippets first.