Method scanNode_

src/service/fixed-layer.js:213–220

* @param {!Node} node * @param {boolean=} opt_lightboxMode * @private

(node, opt_lightboxMode)

   * @private
   */
  scanNode_(node, opt_lightboxMode) {
    this.trySetupSelectors_(node, opt_lightboxMode);

    // Sort tracked elements in document order.
    this.sortInDomOrder_();

    this.update();
  }

  /**
   * Begin observing changes to the hidden attribute.