Fullscreen function

Question

While using <iframe> tag to embed Youtube videos
I am not able to play the video in full screen
After doing some searches on google
I found that by using allowfullscreen attribute it would work
But still it doesnt

Answer 1

Try this code
Just change your video id
<iframe src="http://www.youtube.com/embed/W7qWa52k-nE" width="560" height="315" frameborder="0" allowfullscreen>
</iframe>

Answer 2

I did but still doesnt work