<h1>test iframe</h1>
<h2>youtube video page</h2>
<p>youtube video page which does not allowed to be load via iframe. (Load denied by X-Frame-Options: http://xxxxx does not permit cross-origin framing.)</p>
<iframe src="https://www.youtube.com/watch?v=vGXWCpePuoI"></iframe>
<h2>youtube embed url</h2>
<p>youtube embed url which is allowed to be load via iframe.</p>
<iframe src="https://www.youtube.com/embed/vGXWCpePuoI"></iframe>