Autoplayed Videos and Animated GIFs Start On Slideshow Load

[doakey3]

Expected Behavior: Autoplayed videos and Animated GIFs start when parent slide becomes main focus
Actual Behavior: Autoplayed videos and Animated GIFs start on slideshow load

Benefits of Fix:

• Don't have to click 'play'
• Stepwise animations become possible

Sample rst:

Title
=====

This is the first slide

-----------------------------------------------

Media
=====

.. raw:: html

    <video width="320" height="180" autoplay>
      <source src="clip.mp4" type="video/mp4">
    </video>

.. image:: animated.gif