jQuery.fn.closest equivalent in DOM js

gistfile1.js

// starting with current element, look up the DOM ancestor tree to see if anything matches the given selector

// returns element if found
// returns false if not found

function closest(elem, selector) {

   var matchesSelector = elem.matches || elem.webkitMatchesSelector || elem.mozMatchesSelector || elem.msMatchesSelector;

    while (elem) {
        if (matchesSelector.bind(elem)(selector)) {
            return elem;
        } else {
            elem = elem.parentNode;
        }
    }
    return false;
}

Is it planned somewhere to add this as an Element method by some spec?