From e2a863405782709e8cd30227f8b1157acc30fa19 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=BB=84=E7=8E=84?= <huxpro@gmail.com>
Date: Mon, 2 May 2016 01:42:11 +0800
Subject: [PATCH] add refused-to-display tips in link-preview-overlay

---
 css/reveal.scss | 10 ++++++++++
 js/reveal.js    |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/css/reveal.scss b/css/reveal.scss
index f8d6904b902..c360fe650f2 100644
--- a/css/reveal.scss
+++ b/css/reveal.scss
@@ -1229,6 +1229,16 @@ html:-moz-full-screen-ancestor {
 		visibility: visible;
 	}
 
+	.reveal .overlay.overlay-preview.loaded .viewport-inner  {
+		position: absolute;
+		z-index: -1;
+		left: 0;
+		top: 60px;
+		width: 100%;
+		text-align: center;
+		letter-spacing: normal;
+	}
+
 	.reveal .overlay.overlay-preview.loaded .spinner {
 		opacity: 0;
 		visibility: hidden;
diff --git a/js/reveal.js b/js/reveal.js
index 10c609e5a4f..e772516d1e9 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -1500,6 +1500,9 @@
 			'<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('');