diff --git a/light9/web/timeline/timeline-elements.html b/light9/web/timeline/timeline-elements.html
--- a/light9/web/timeline/timeline-elements.html
+++ b/light9/web/timeline/timeline-elements.html
@@ -288,3 +288,4 @@
 <script src="adjustable.js"></script>
 <script src="drawing.js"></script>
 <script src="timeline.js"></script>
+<script src="cursor_canvas.js"></script>