<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Bootstrap Headings</title> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="m-4"> <h1>h1. Headings</h1> <h2>h2. Headings</h2> <h3>h3. Headings</h3> <h4>h4. Headings</h4> <h5>h5. Headings</h5> <h6>h6. Headings</h6> </div> </body> </html>