diff --git a/includes/functions/_helpers-templates.php b/includes/functions/_helpers-templates.php
index 208fb12d..d626962b 100644
--- a/includes/functions/_helpers-templates.php
+++ b/includes/functions/_helpers-templates.php
@@ -294,6 +294,24 @@ if ( ! function_exists( 'fictioneer_get_safe_title' ) ) {
   }
 }
 
+function custom_blur_title_with_spoiler( $title, $post_id, $context ) {
+    // Check if the context is relevant to modify the title (don't affect checkmarks)
+    if ( ! in_array( $context, ['story-chapter-list', 'shortcode-chapter-list'] ) ) {
+        return $title;
+    }
+
+    // Check if the title should be treated as a spoiler
+    // $has_spoiler = get_post_meta( $post_id, '_has_spoiler', true ); // Custom meta to mark spoilers
+
+    if ( true ) {
+        // Adds the class to the title without changing the HTML structure
+        $title = '<span class="spoiler-title">' . $title . '</span>'; // Using a neutral tag like <span>
+    }
+
+    return $title;
+}
+add_filter( 'fictioneer_filter_safe_title', 'custom_blur_title_with_spoiler', 10, 3 );
+
 /**
  * Returns sanitized safe title
  *
diff --git a/includes/functions/_setup-shortcodes.php b/includes/functions/_setup-shortcodes.php
index 1f977aac..29cbec73 100644
--- a/includes/functions/_setup-shortcodes.php
+++ b/includes/functions/_setup-shortcodes.php
@@ -1334,7 +1334,12 @@ function fictioneer_shortcode_chapter_list( $attr ) {
                 data-id="<?php echo $chapter_id; ?>"
                 role="checkbox"
                 aria-checked="false"
-                aria-label="<?php printf( esc_attr__( 'Chapter checkmark for %s.', 'fictioneer' ), $title ); ?>"
+                aria-label="<?php
+                  printf(
+                    esc_attr__( 'Chapter checkmark for %s.', 'fictioneer' ),
+                    esc_attr( wp_strip_all_tags( $title ) )
+                  );
+                ?>"
               ><i class="fa-solid fa-check"></i></button>
             <?php endif; ?>
           </li>
diff --git a/includes/functions/hooks/_story_hooks.php b/includes/functions/hooks/_story_hooks.php
index 377db461..155ab808 100644
--- a/includes/functions/hooks/_story_hooks.php
+++ b/includes/functions/hooks/_story_hooks.php
@@ -671,7 +671,12 @@ function fictioneer_story_chapters( $args ) {
                       data-id="<?php echo $chapter['id']; ?>"
                       role="checkbox"
                       aria-checked="false"
-                      aria-label="<?php printf( esc_attr__( 'Chapter checkmark for %s.', 'fictioneer' ), $chapter['title'] ); ?>"
+                      aria-label="<?php
+                        printf(
+                          esc_attr__( 'Chapter checkmark for %s.', 'fictioneer' ),
+                          esc_attr( wp_strip_all_tags( $chapter['title'] ) )
+                        );
+                      ?>"
                     ><i class="fa-solid fa-check"></i></button>
                   <?php endif; ?>