IOS 7 – css – html height – 100% = 692px

I used this JavaScript solution for solving that problem:

if (
    navigator.userAgent.match(/iPad;.*CPU.*OS 7_\d/i) && 
    window.innerHeight != document.documentElement.clientHeight
) {
    var fixViewportHeight = function() {
        document.documentElement.style.height = window.innerHeight + "px";
        if (document.body.scrollTop !== 0) {
            window.scrollTo(0, 0);
        }
    };

    window.addEventListener("scroll", fixViewportHeight, false);
    window.addEventListener("orientationchange", fixViewportHeight, false);
    fixViewportHeight();

    document.body.style.webkitTransform = "translate3d(0,0,0)";
}