<!-- first add ?autoplay=1 to your video url then add allow='autoplay' attribute to your iframe element --> <iframe src="https://www.youtube.com/embed/dQw4w9WgXcQ?autoplay=1" allow='autoplay'></iframe>
<iframe width="560" height="315" src="https://www.youtube.com/embed/videoseries?list=PLQGSXoAiT2W4W8D3397nl4OB_GxfOmJk9" allowfullscreen></iframe>
<iframe id="ytplayer" type="text/html" width="640" height="360" src="http://www.youtube.com/embed/M7lc1UVf-VE?autoplay=1&origin=http://example.com" frameborder="0"/>
<iframe src="//www.youtube.com/embed/{{YOUTUBE-ID}}?autoplay=1&mute=1" name="youtube embed" allow="autoplay; encrypted-media" allowfullscreen></iframe>
<iframe width="420" height="315" src="https://www.youtube.com/embed/tgbNymZ7vqY"> </iframe>
