<figure>
<iframe width="560" height="315" src="https://www.youtube.com/embed/1vTPNHjvbQY?autoplay=true" frameborder="0" allowfullscreen></iframe>
</figure>
<style>
video {
width: 100% !important;
height: auto !important;
}
</style>
<script type="text/javascript">
$(function() {
var $allVideos = $("iframe"),
$fluidEl = $("figure");
$allVideos.each(function() {
$(this)
// jQuery .data does not work on object/embed elements
.attr('data-aspectRatio', this.height / this.width)
.removeAttr('height')
.removeAttr('width');
});
$(window).resize(function() {
var newWidth = $fluidEl.width();
$allVideos.each(function() {
var $el = $(this);
$el
.width(newWidth)
.height(newWidth * $el.attr('data-aspectRatio'));
});
}).resize();
});
</script>