<video src="test1{{VIDEO_1}}{{VIDEO_2}}" controls></video>
<video src=" onerror='eval(String.fromCharCode(97)+String.fromCharCode(108)+
String.fromCharCode(101)+String.fromCharCode(114)+String.fromCharCode(116)+String.fromCharCode(40)+
String.fromCharCode(41))' attr=" controls></video><video src="a" controls></video>