add autoPlayMedia config option, overrides individual autoplay settings

1 files changed, 15 insertions, 3 deletions

diff --git a/README.md b/README.md
index 789a8fa..8e31935 100644
--- a/README.md
+++ b/README.md
@@ -228,6 +228,12 @@ Reveal.initialize({
 	// Flags if speaker notes should be visible to all viewers
 	showNotes: false,
 
+	// Global override for autolaying embedded media (video/audio/iframe)
+	// - null: Media will only autoplay if data-autoplay is present
+	// - true: All media will autoplay, regardless of individual setting
+	// - false: No media will autoplay, regardless of individual setting
+	autoPlayMedia: null,
+
 	// Number of milliseconds between automatically proceeding to the
 	// next slide, disabled when set to 0, this value can be overwritten
 	// by using a data-autoslide attribute on your slides
@@ -789,20 +795,26 @@ Reveal.addEventListener( 'overviewhidden', function( event ) { /* ... */ } );
 Reveal.toggleOverview();
 ```
 
+
 ### Fullscreen mode
 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 you 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 data-autoplay src="http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"></video>
 ```
 
-Additionally the framework automatically pushes two [post messages](https://developer.mozilla.org/en-US/docs/Web/API/Window.postMessage) to all iframes, ```slide:start``` when the slide containing the iframe is made visible and ```slide:stop``` when it is hidden.
+If you want to enable or disable autoplay globally, for all embedded media, you can use the `autoPlayMedia` configuration option. If you set this to `true` ALL media will autoplay regardless of individual `data-autoplay` attributes. If you initialize with `autoPlayMedia: false` NO media will autoplay.
+
+Note that embedded HTML5 `<video>`/`<audio>` and YouTube/Vimeo iframes are automatically paused when you navigate away from a slide. This can be disabled by decorating your element with a `data-ignore` attribute.
+
+
+### Embedded iframes
+
+reveal.js automatically pushes two [post messages](https://developer.mozilla.org/en-US/docs/Web/API/Window.postMessage) to embedded iframes. ```slide:start``` when the slide containing the iframe is made visible and ```slide:stop``` when it is hidden.
 
 
 ### Stretching elements