diff --git a/anchor_link.ckeditor5.yml b/anchor_link.ckeditor5.yml
index 52893df92485d9834bc6e59e313e48a714cac22f..bcb87989a25df3ced1c8598bdc77d02f7e60ad92 100644
--- a/anchor_link.ckeditor5.yml
+++ b/anchor_link.ckeditor5.yml
@@ -24,6 +24,7 @@ anchor_link_ckeditor5_anchor:
     elements:
       - <a>
       - <a id="">
+      - <a name="">
       - <a target="">
       - <a rel="">
       - <a class="ck-anchor">
diff --git a/anchor_link.post_update.php b/anchor_link.post_update.php
new file mode 100644
index 0000000000000000000000000000000000000000..356c7c529bcdef69596cc841770bbf57bb7102cd
--- /dev/null
+++ b/anchor_link.post_update.php
@@ -0,0 +1,55 @@
+<?php
+
+use Drupal\editor\Entity\Editor;
+
+/**
+ * Add anchor name attribute to allowed html.
+ */
+function anchor_link_post_update_allow_anchor_name_attribute() {
+  _ckeditor5_plugin_supports_more_elements_append_to_filter_html_settings('anchor_link_ckeditor5_anchor', '<a name>');
+}
+
+/**
+ * Expands filter_html allowed tags for CKE5 plugin that supports more HTML.
+ *
+ * @param string $cke5_plugin_id
+ *   The CKEditor 5 plugin ID which supports more HTML after an update.
+ * @param string $allowed_html_to_append
+ *   The string to append to `filter_html`'s `allowed_html` setting.
+ */
+function _ckeditor5_plugin_supports_more_elements_append_to_filter_html_settings(string $cke5_plugin_id, string $allowed_html_to_append) {
+  $cke5_plugin_manager = \Drupal::service('plugin.manager.ckeditor5.plugin');
+  assert($cke5_plugin_manager instanceof \Drupal\ckeditor5\Plugin\CKEditor5PluginManagerInterface);
+
+  // 1. Determine which text editors use the updated CKEditor 5 plugin.
+  $affected_editors = [];
+  foreach (Editor::loadMultiple() as $editor) {
+    // Text editors not using CKEditor 5 cannot be affected.
+    if ($editor->getEditor() !== 'ckeditor5') {
+      continue;
+    }
+    // Ask the plugin manager which CKEditor 5 plugins are enabled; this works
+    // for every plugin, no matter if they have toolbar items or not, conditions
+    // or not, et cetera.
+    $enabled_cke5_plugin_ids = array_keys($cke5_plugin_manager->getEnabledDefinitions($editor));
+    if (in_array($cke5_plugin_id, $enabled_cke5_plugin_ids, TRUE)) {
+      $affected_editors[] = $editor;
+    }
+  }
+
+  // 2. Update the corresponding text formats' `filter_html` configuration, if
+  // they are using that filter plugin.
+  foreach ($affected_editors as $editor) {
+    $format = $editor->getFilterFormat();
+    // Text formats not using `filter_html` filter do not need to be updated.
+    if (!$format->filters('filter_html')->status) {
+      continue;
+    }
+    // Append to "Allowed HTML tags" setting.
+    $filter_html_config = $format->filters('filter_html')->getConfiguration();
+    $filter_html_config['settings']['allowed_html'] .= ' ' . trim($allowed_html_to_append);
+    $format->setFilterConfig('filter_html', $filter_html_config);
+    // Save updated text format.
+    $format->save();
+  }
+}