qt5base-lts/examples/webkit/webkit-guide/js/mob_condjs.js

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window.onload = function() {
    var msg = 'JavaScript thinks you are viewing this page with a ';
    if ( isDesign('desktop') ) {
        msg += 'full desktop browser';
    }
    else if ( isDesign('touch') ) {
        msg += 'touch-based mobile browser';
    }
    else if ( isDesign('mobile') ) {
        msg += 'non-touch mobile browser';
    }
    else {
        msg = window.styleMedia.matchMedium;
    }
    document.getElementById('js').innerHTML = msg;
};

function isDesign(str) {
    var design;
    if (matchesMedia('only screen and (min-device-width: 481px)')) {
        design = 'desktop';
    }
    else if (matchesMedia('only screen and (max-device-width: 480px)')) {
        design = 'touch';
    }
    else if (matchesMedia('handheld')) {
        design = 'mobile';
    }
    return str == design;
}

function matchesMedia(query) {
    if (!!window.matchMedia)
        return window.matchMedia(query).matches;
    if (!!window.styleMedia && !!window.styleMedia.matchMedium)
        return window.styleMedia.matchMedium(query);
    if (!!window.media && window.media.matchMedium)
        return window.media.matchMedium(query);
    return false;
}