DOM MutationEvent Feature Detection

mutations.js

var mutations = (function (document) {
    // (C) WebReflection - Mit Style License
    var
        type = [
            "DOMSubtreeModified",
            "DOMNodeInserted",
            "DOMNodeRemoved",
            "DOMNodeRemovedFromDocument",
            "DOMNodeInsertedIntoDocument",
            "DOMAttrModified",
            "DOMCharacterDataModified"
        ],
        documentElement = document.documentElement,
        method = "EventListener",
        data = "deleteData",
        p = document.createElement("p"),
        mutations = {},
        i
    ;
    function check(addOrRemove) {
        for (i = type.length; i--;) {
            p[addOrRemove](type[i], cb, false);
            documentElement[addOrRemove](type[i], cb, false);
        }
    }
    function cb(e) {
        mutations[e.type] = true;
    }
    check("add" + method);
    documentElement.insertBefore(
        p,
        documentElement.lastChild
    );
    p.setAttribute("i", i);
    p = p.appendChild(document.createTextNode(i));
    data in p && p[data](0, 1);
    documentElement.removeChild(p = p.parentNode);
    check("remove" + method);
    return (p = mutations);
}(document));

// exmple
// alert(Object.keys(mutations).join("\n"));