fix raf

website/canvas/event-propagators-with-device-gravity.html

@@ -77,6 +77,7 @@ rotation: from.x"
        * 270 -> 3000, 0
       */
       function tick() {
+        requestAnimationFrame(tick);
         if (orientationEvent === undefined) return;
 
         window.alpha.textContent = orientationEvent.alpha.toFixed(2);
@@ -86,7 +87,6 @@ rotation: from.x"
         // if (event.alpha) {
         //   // ropes.forEach(rope => { rope.gravity = { x: 0, y: 0} })
         // }
-        requestAnimationFrame(tick);
       }
 
       tick();