My team and I are tying to make a web application autoplay HTML5 video/audio tags on iPad. So far no luck after many attempts with CSS and
you can't auto-play videos and audios on iOS in normal mode, you may use trick like simulate user input to auto-play videos and audios.
Safari HTML5 Audio and Video Guide
In Safari on iOS (for all devices, including iPad), where the user may be on a cellular network and be charged per data unit, preload and autoplay are disabled. No data is loaded until the user initiates it. This means the JavaScript play() and load() methods are also inactive until the user initiates playback, unless the play() or load() method is triggered by user action. In other words, a user-initiated Play button works, but an onLoad="play()" event does not.
This plays the movie: <input type="button" value="Play" onclick="document.myMovie.play()">
This does nothing on iOS: <body onload="document.myMovie.play()">
Have you found solution for autoplay video on iOS device? If not, I've just find a solution here, you can use WeChat of iPhone to open it (just support WeChat of iPhone but not support iPad WeChat), it use video.js player, related code as below:
<video id="example_video_1" class="video-js vjs-default-skin" controls autoplay preload="auto" webkit-playsinline="true" x-webkit-airplay="true" width="750" height="460" poster="" data-setup="{}">
It also has solution for support video play without full screen on iOS/Android/PC.