/* ---------------------------- Positioning ----------------------------- 
Shortcut to set absolute positioning props
@param {string|object} p Position string in the form of
'l:10px t:10px r:30% h:200px'
function(pos) {
        if (!arguments.length) {
            return this._styleToPos(this.dom().style);
        }
        pos = this._expandPos(pos);
        this.addStyle(pos);
        return this;
    }