>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3533572. --> Reported by: [cadence96](https://www.drupal.org/user/3520894) Related to !66 >>> <p>When trying to access the API documentation page for the class <code>\Drupal\Core\Render\Element\Details</code> in the Drupal 11 branch, the page fails to load and returns a <strong>5xx Server Error</strong>.</p> <ul> <li><strong>Bugged API page:</strong><br> <a href="https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Render%21Element%21Details.php/class/Details/11.x" target="_blank" rel="noopener">https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Render%21Element%21Details.php/class/Details/11.x<br> </a><br> </li> <li><strong>How to locate the broken link:</strong> <ol> <li>Visit the class file documentation:<a href="https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Render%21Element%21Details.php/11.x" target="_blank" rel="noopener"><br> https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Render%21Element%21Details.php/11.x<br> </a><br> </li> <li>In the table that lists classes/functions (with columns like <em>Title</em>, <em>Deprecated</em>, <em>Summary</em>), click on the <strong>Details</strong> class link &mdash; it leads to the broken page above.<br><br></li> <li>Alternatively, go to the Drupal 10 page:<a href="https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Render!Element!Details.php/class/Details/10" target="_blank" rel="noopener"><br> https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Render!Element!Details.php/class/Details/10<br> </a>There&rsquo;s a link at the top that says:<em><br>You are browsing documentation for Drupal 10.3.x&hellip; Read the updated version of this page for Drupal 11.x (the latest version).</em><br><br> That link also points to the broken page. </li> </ol> </li> <li><strong>Expected behavior:</strong><br> The class documentation should load successfully for Drupal 11.x.<br><br> </li> <li><strong>Actual behavior:</strong><br> The page returns a <strong>5xx Server Error</strong>.<br><br> </li> <li><strong>Tested environment:</strong><br> Verified in multiple browsers. The issue is persistent. </li> </ul>