Using a fixed css3 background images works fine for the desktop (Chrome, Firefox, IE/Edge no issues), it stays always at the screen with full-height and width bg. Unfortunately it does not work on mobile devices. Tablets and phones with Android are unable to fix the image in the background. Is there a way to check the device height/width to load different media or is it possible to simply zoom or scale the image automatically? Are there maybe any JS kits to accomplish this.
Moreover I plan to embed a background video (webm), does this work on mobile devices? May I ask to check if there is way, the video background loads only with WiFi connection. Otherwise it shall be a static image.