Autoplay video set to not display on mobile launches anyway in WebApp mode

I have this HTML video in a section background, set to appear only for Desktop:

http://vincent.polenordstudio.fr/snap/42utt.jpg

The setting works, except for when the site is saved as a Web App on an iPhone for example. When you launch the site, when the video has loaded, it plays fullscreen in a video player.

I’m ok for any code-related workaround, I need to deliver the project and this is the only bug.

Thanks!