GetAllBrowserSupportedEventNames.js

function getEventNames() {
    var doc = [];
    for (var i in document) {
        doc.push(i)
    };
    doc = doc.filter(function(i) {
            var e = document[i];
            return i.substring(0, 2) == 'on' && (e == null || e instanceof Function)
        })
        .map(s => s.replace(/^on/, ""));

    var win = [];
    for (var i in window) {
        win.push(i)
    };
    win = win.filter(function(i) {
            var e = window[i];
            return i.substring(0, 2) == 'on' && (e == null || e instanceof Function)
        })
        .map(s => s.replace(/^on/, ""))
        .filter(e => !doc.find(ee => e === ee))
    var res = {
        document: doc,
        window: win
    }
    return res;
}