diff --git a/addtocalendar/src/AddToCalendarApiWidget.php b/addtocalendar/src/AddToCalendarApiWidget.php
index e7b8997..77581dc 100644
--- a/addtocalendar/src/AddToCalendarApiWidget.php
+++ b/addtocalendar/src/AddToCalendarApiWidget.php
@@ -177,6 +177,9 @@ class AddToCalendarApiWidget {
       '#value' => $display_text->__toString(),
       '#attributes' => [
         'class' => 'atcb-link',
+        'role' => 'button',
+        'tabindex' => 0,
+        'aria-expanded' => FALSE,
       ],
     ];
     $timeZone = $this->timeZone;