From bdda443335ceb39ea796ec185655e69e970c0698 Mon Sep 17 00:00:00 2001
From: TehDmitry
Date: Sun, 9 Jun 2019 16:31:36 +0300
Subject: Allowing autoplay in data-background-iframe for audio and video
 elements It was restricted by «Autoplay Policy Changes»:
 https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#iframe

---
 js/reveal.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/js/reveal.js b/js/reveal.js
index 0065e9b..2cb1dfb 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -3855,6 +3855,7 @@
 					iframe.setAttribute( 'allowfullscreen', '' );
 					iframe.setAttribute( 'mozallowfullscreen', '' );
 					iframe.setAttribute( 'webkitallowfullscreen', '' );
+					iframe.setAttribute( 'allow', 'autoplay' );
 
 					iframe.setAttribute( 'data-src', backgroundIframe );
 
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