gistfile1.js

      ready: function() {
        this.resizeListeners = [];
        if (!this.fire('request-resize-advice', {sender: this, ok: false}, this.parentNode).ok) {
          console.log('using window resize');
          window.addEventListener('resize', this.resize.bind(this));
        } else {
          console.log('using ancestor resize');
        }
      },
      requestResizeAdvice: function(event, detail) {
        this.resizeListeners.push(detail.sender);
        detail.ok = true;
      },