code: function getMarkupWrap(nodeName) {
  	  !!!dummyNode ? process.env.NODE_ENV !== 'production' ? invariant(false, 'Markup wrapping node not initialized') : invariant(false) : void 0;
  	  if (!markupWrap.hasOwnProperty(nodeName)) {
  	    nodeName = '*';
  	  }
  	  if (!shouldWrap.hasOwnProperty(nodeName)) {
  	    if (nodeName === '*') {
  	      dummyNode.innerHTML = '<link />';
  	    } else {
  	      dummyNode.innerHTML = '<' + nodeName + '></' + nodeName + '>';
  	    }
  	    shouldWrap[nodeName] = !dummyNode.firstChild;
  	  }
  	  return shouldWrap[nodeName] ? markupWrap[nodeName] : null;
  	}
docs: Gets the markup wrap configuration for the supplied `nodeName`.
  
  NOTE: This lazily detects which wraps are necessary for the current browser.
  
  @param {string} nodeName Lowercase `nodeName`.
  @return {?array} Markup wrap configuration, if applicable.