Fix html detection

Author: matthewp

demo_frame.js

@@ -61,7 +61,7 @@ module.exports = function(node){
 				var clonedBody = this.contentDocument.body.cloneNode(true);
 				var scripts = [].slice.call(clonedBody.getElementsByTagName("script"));
 				scripts.forEach(function(script){
-					if(!script.type || script.type.indexOf("javascript") >= 0) {
+					if(!script.type || script.type.indexOf("javascript") === -1) {
 						script.parentNode.removeChild(script);
 					}
 				});
@@ -80,7 +80,7 @@ module.exports = function(node){
 				var scripts = [].slice.call(this.contentDocument.querySelectorAll("script"));
 				// get the first one that is JS
 				for(var i =0; i < scripts.length; i++){
-					if(!scripts[i].type || (scripts[i].type.indexOf("javascript") === 0 &&
+					if(!scripts[i].type || (scripts[i].type.indexOf("javascript") >= 0 &&
 						!scripts[i].src)){
 						source =  scripts[i].innerHTML;
 						break;