Update manual-tests.html

Author: nondebug

manual-tests.html

@@ -326,6 +326,11 @@ <h3>Back-forward cache</h3>
 Do gamepadconnected and gamepaddisconnected events fire for connection changes that occurred while the page was cached?
 </p>
 
+<h3>Gamepad user gesture</h3>
+<p>
+Are gamepads hidden before the first gamepad gesture? Does a button press count as a gesture? Does an axis movement count as a gesture? Does a touchpad input count as a gesture?
+</p>
+
 <h3>User activation</h3>
 <p>
 Is a gamepad button press counted as user activation for APIs that require user activation? Can fullscreen API trigger on a button press? Press the "start" button to try going fullscreen.