Today I will share you the issue what take me entire of day to solve about Full width 100% for youtube video iframe. Hope it will save your time. If you meet this issue, I believe it just take you 5 minutes to finish the task.
There are 2 ways to solve this issue
1. Javascript to make Full width 100% iframe/embed
Simple add this jQuery code
// Find all YouTube videos
var $allVideos = $("iframe[src^='http://www.youtube.com']"),
    // The element that is fluid width
    $fluidEl = $("body");
// Figure out and save aspect ratio for each video
$allVideos.each(function() {
  $(this)
    .data('aspectRatio', this.height / this.width)
    // and remove the hard coded width/height
    .removeAttr('height')
    .removeAttr('width');
});
// When the window is resized
$(window).resize(function() {
  var newWidth = $fluidEl.width();
  // Resize all videos according to their own aspect ratio
  $allVideos.each(function() {
    var $el = $(this);
    $el
      .width(newWidth)
      .height(newWidth * $el.data('aspectRatio'));
  });
// Kick off one resize to fix all videos on page load
}).resize();Now, reload the page and see the magic.
2. CSS to make Full width 100% iframe/embed
Much more simple, you can apply this css tips and the result will be the same.
.videoWrapper {
	position: relative;
	padding-bottom: 56.25%; /* 16:9 */
	padding-top: 25px;
	height: 0;
}
.videoWrapper object,
.videoWrapper embed,  {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
}Remember add class videoWrapper out of your video then the video inside this class will be display 100%.
Now, enjoy the result and welcome any comment.
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Work nice! You save me a lot of time with your tips. It even work smooth on mobile web too. Great!
Not work here in chrome at least. Not sure what wrong. I sent you in contact page, please help me. Thanks