Force iframe YouTube video to center fit and full

问题:

How do you force HTML5 iframe YouTube video to center fit, cover the full-screen window background using CSS3 HTML eventually Java?

As for example "paypal.it" home page background or "unity3d.com/5" top video, has as iframe youtube video. The iframe cover full screen (zooming) and cover all the width and height when re-size the window. It re-size maintaining the 100% min width zooming the height or the 100% min height zooming the width.

How is this effect achieve using iframe HTML5 and CSS3?

Code Example HTML5

<div class="video" style="opacity: 1;">

    <iframe src="http://www.youtube.com/embed/AddHereVideoId?autoplay=1&amp;html5=1" frameborder="0" style="height: 720px;">
     </iframe>

</div>

Code CSS3 HTML eventually Java help would be appreciated.

回答1:

For a real full screen solution, this can be achieved like this:

HTML

<div class="video-background">
    <div class="video-foreground">
      <iframe src="https://www.youtube.com/embed/I4agXcHLySs?controls=0&showinfo=0&rel=0&autoplay=1&loop=1&mute=1" frameborder="0" allowfullscreen></iframe>
    </div>
  </div>

CSS

* { box-sizing: border-box; }
.video-background {
  background: #000;
  position: fixed;
  top: 0; right: 0; bottom: 0; left: 0;
  z-index: -99;
}
.video-foreground,
.video-background iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

@media (min-aspect-ratio: 16/9) {
  .video-foreground { height: 300%; top: -100%; }
}
@media (max-aspect-ratio: 16/9) {
  .video-foreground { width: 300%; left: -100%; }
}
@media all and (max-width: 600px) {
.vid-info { width: 50%; padding: .5rem; }
.vid-info h1 { margin-bottom: .2rem; }
}
@media all and (max-width: 500px) {
.vid-info .acronym { display: none; }
}

It is not perfect, e.g. it does not work well with extreme aspect ratios of the container, but is doing a great job in most situations. Here is a working example: https://codepen.io/anon/pen/zRVLGJ

回答2:

I think this is what you're trying to achieve:

.video-wrapper {position: relative; padding-bottom: 56.25%; /* 16:9 */  padding-top: 25px;}
.video-wrapper iframe {position: absolute; top: 0; left: 0; width: 100%; height: 100%;}

<div class="video-wrapper">
  <iframe src="http://www.youtube.com/embed/AddHereVideoId?autoplay=1&amp;html5=1" frameborder="0" allowfullscreen></iframe>
</div>

This will give you a video that fills the container that it is in and will automatically scale the height too.

I originally found this solution here: https://css-tricks.com/NetMag/FluidWidthVideo/Article-FluidWidthVideo.php