<video controls
    width="250"
    height="200"
    muted>
    <source src="/media/cc0-videos/flower.webm"
            type="video/webm">
    <source src="/media/cc0-videos/flower.mp4"
            type="video/mp4">
    This browser does not support the HTML5 video element.
</video>

footer {
    font-size: .8rem;
    position: absolute;
    bottom: 10px;
    right: 10px;
}

.output {
    background: #eee;
    position: relative;
}