Iframe lazy loading code example

Example: iframe video lazy loading

<div class="youtube-video-place embed-responsive embed-responsive-4by3 " data-yt-url="https://www.youtube.com/embed/BjngNWP9C5s?rel=0&showinfo=0&autoplay=1"><img src="/dist/images/your-video-thumbnail.jpg" async class="play-youtube-video"></div>