From e16a220a624cc3f9888ae59feebbd989669a7f31 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Thu, 7 May 2015 16:36:57 +0200
Subject: [PATCH] fix iframe unload in firefox

---
 js/reveal.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/js/reveal.js b/js/reveal.js
index 2c55833..c46ddb6 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -2986,6 +2986,9 @@
 
 			// Lazy loading iframes
 			toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
+				// Only removing the src doesn't actually unload the frame
+				// in all browsers (Firefox) so we set it to blank first
+				el.setAttribute( 'src', 'about:blank' );
 				el.removeAttribute( 'src' );
 			} );
 		}