>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3577310. --> Reported by: [liam morland](https://www.drupal.org/user/493050) Related to !165 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Template <code>book-navigation.html.twig</code> has some unused code and optimizations that could be made.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Make these improvements.</p> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <p>Implement.</p> <h3 id="summary-ui-changes">User interface changes</h3> <p>None.</p> <h3 id="summary-api-changes">API changes</h3> <p>None.</p> <h3 id="summary-data-model-changes">Data model changes</h3> <p>None.</p>