How to activate full screen flag in vimeo, youtube video in iframe
<p>I have an iframe which contains vimeo video How I can activate full screen flag in that video</p>

<p>Here is the HTML of iframe which contains video.</p>

<pre><code>&lt;iframe width="500" height="281" frameborder="0" src="https://player.vimeo.com/video/155984146?color=ececec&amp;amp;title=0&amp;amp;byline=0&amp;amp;portrait=0;"&gt;&lt;/iframe&gt;
</code></pre>