diff --git a/cadquery/cq_directive.py b/cadquery/cq_directive.py
index 3749c379f..09b21136f 100644
--- a/cadquery/cq_directive.py
+++ b/cadquery/cq_directive.py
@@ -192,7 +192,7 @@
 
 .. raw:: html
 
-    <div class="cq-vtk"
+    <div class="cq-vtk" role="navigation"
      style="text-align:{txt_align};float:left;border: 1px solid #ddd; width:{width}; height:{height}">
        <script>
        var parent_element = {element};