GIF Web Video

<img src="myAnimation.gif" />

<video loop muted autoplay playsinline>
    <source src="/video.webm" type="video/webm">
    <source src="/video.ogg" type="video/ogg">
    <source src="/video.mov" type="video/quicktime">
    <source src="/video.mp4" type="video/mp4">
</video>

document.querySelectorAll('video[autoplay]').forEach(video => {
   video.playbackRate = 0.75;
   video.onended = () => setTimeout(() => video.play(), 500);
});