update readme to cover #388

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@@ -364,6 +364,16 @@ Reveal.toggleOverview();
 Just press »F« on your keyboard to show your presentation in fullscreen mode. Press the »ESC« key to exit fullscreen mode.
 
 
+### Embedded media
+Embedded HTML5 video/audio and YouTube iframes are automatically paused when your navigate away from a slide. This can be disabled by decorating your element with a `data-ignore` attribute.
+
+Add `data-autoplay` to your media element if you want it to automatically start playing when the slide is shown:
+
+```html
+<video src="http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4" data-autoplay></video>
+```
+
+
 ## PDF Export
 
 Presentations can be exported to PDF via a special print stylesheet. This feature requires that you use [Google Chrome](http://google.com/chrome).