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Page Content</a> </li> <li class="nav-dropdown-list-chapter"> <span class="nav-dropdown-list-todo">Chapter 1: CSS</span> </li> <li class="nav-dropdown-list-chapter"> <span class="nav-dropdown-list-todo">Chapter 2: JavaScript</span> </li> <li class="nav-dropdown-list-chapter"> <a href="/en/2024/markup"> Chapter 3: Markup </a> </li> <li class="nav-dropdown-list-chapter"> <a href="/en/2024/structured-data"> Chapter 4: Structured Data </a> </li> <li class="nav-dropdown-list-chapter"> <a href="/en/2024/fonts"> Chapter 5: Fonts </a> </li> <li class="nav-dropdown-list-chapter"> <span class="nav-dropdown-list-todo">Chapter 6: Media</span> </li> <li class="nav-dropdown-list-chapter"> <span class="nav-dropdown-list-todo">Chapter 7: WebAssembly</span> </li> <li class="nav-dropdown-list-chapter"> <a href="/en/2024/third-parties"> Chapter 8: Third Parties </a> </li> <li class="nav-dropdown-list-part"> <a href="/en/2024/table-of-contents#part-2">Part II. User Experience</a> </li> <li class="nav-dropdown-list-chapter"> <span class="nav-dropdown-list-todo">Chapter 9: SEO</span> </li> <li class="nav-dropdown-list-chapter"> <a href="/en/2024/accessibility"> Chapter 10: Accessibility </a> </li> <li class="nav-dropdown-list-chapter"> <a href="/en/2024/performance"> Chapter 11: Performance </a> </li> <li class="nav-dropdown-list-chapter"> <span class="nav-dropdown-list-todo">Chapter 12: Privacy</span> </li> <li class="nav-dropdown-list-chapter"> <a href="/en/2024/security"> Chapter 13: Security </a> </li> <li class="nav-dropdown-list-part"> <a href="/en/2024/table-of-contents#part-3">Part III. Content Publishing</a> </li> <li class="nav-dropdown-list-chapter"> <a href="/en/2024/cms"> Chapter 14: CMS </a> </li> <li class="nav-dropdown-list-chapter"> <a href="/en/2024/ecommerce"> Chapter 15: Ecommerce </a> </li> <li class="nav-dropdown-list-chapter"> <a href="/en/2024/jamstack"> Chapter 16: Jamstack </a> </li> <li class="nav-dropdown-list-chapter"> <a href="/en/2024/sustainability"> Chapter 17: Sustainability </a> </li> <li class="nav-dropdown-list-part"> <a href="/en/2024/table-of-contents#part-4">Part IV. 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