How to Autoplay a YouTube video in Iframe embed

By Default a YouTube Iframe embed code don’t auto play a video  when embedded on a web page.

It can be auto played by simply adding this URL parameter in URL of video.


So, The iframe code for a YouTube video which auto play when embedded on a page is

<iframe width="640" height="360" src=";autoplay=1" frameborder="0" allowfullscreen></iframe>