getAbnormalProps.js

function getAbnormalProps () {
    var f = document.createElement("iframe");
    f.src = "about:blank";
    document.body.appendChild(f);
    var normalProps = Object.keys(f.contentWindow);
    
    var result = {};
    
    Object.keys(window).filter(p => !normalProps.includes(p)).forEach(p => { result[p] = window[p]; });
    
    document.body.removeChild(f);
    
    return result;
}

getAbnormalProps();