1 files changed, 3 insertions, 0 deletions
diff --git a/js/reveal.js b/js/reveal.js
index 28aa400..e9dba2e 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -1603,6 +1603,9 @@
 			'<div class="spinner"></div>',
 			'<div class="viewport">',
 				'<iframe src="'+ url +'"></iframe>',
+				'<small class="viewport-inner">',
+				'This link is refused to display in a frame due to its policy',
+				'</small>',
 			'</div>'
 		].join('');