diff --git a/core/modules/parsers/htmlparser.js b/core/modules/parsers/htmlparser.js
index b2528e961..39b0c21df 100644
--- a/core/modules/parsers/htmlparser.js
+++ b/core/modules/parsers/htmlparser.js
@@ -24,7 +24,7 @@ var HtmlParser = function(type,text,options) {
 		tag: "iframe",
 		attributes: {
 			src: {type: "string", value: src},
-			sandbox: {type: "string", value: "sandbox"}
+			sandbox: {type: "string", value: ""}
 		}
 	}];
 };