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<iframe src="//www.youtube.com/embed/_wAlVz3tJvw" frameborder="0" allowfullscreen></iframe>

<iframe width="560" height="315" src="//www.youtube.com/embed/_wAlVz3tJvw"  allowfullscreen></iframe>

<iframe width="560" height="315" src="//www.youtube.com/embed/_wAlVz3tJvw" frameborder="0"></iframe>

----------------------------- WEB content ---------------------------------

<iframe width="560" height="315" src="http://www.bing.com" frameborder="0" allowfullscreen></iframe>

<iframe src="http://www.bing.com" frameborder="0" allowfullscreen></iframe>

<iframe width="560" height="315" src="http://www.bing.com"  allowfullscreen></iframe>

<iframe width="560" height="315" src="http://www.bing.com" frameborder="0"></iframe>