Get DOM text node from point?

Just like I can get an element from a point with document.elementFromPoint or document.getElementFromPoint, is it possible to somehow get a text node if the point is at a text node? I guess if at least I could get the text node's position and size I could then figure out which of them contains the point. But then DOM nodes don't have position properties. Is it possible to do this at all?

Here is an implementation that works in all current browsers: https://github.com/nuxodin/q1/blob/master/q1.dom.js

document.betaNodeFromPoint = function(x, y){
    var el = document.elementFromPoint(x, y);
    var nodes = el.childNodes;
    for ( var i = 0, n; n = nodes[i++];) {
        if (n.nodeType === 3) {
            var r = document.createRange();
            r.selectNode(n);
            var rects = r.getClientRects();
            for ( var j = 0, rect; rect = rects[j++];) {
                if (x > rect.left && x < rect.right && y > rect.top && y < rect.bottom) {
                    return n;
                }
            }
        }
    }
    return el;
};