code: function getHTMLAttribute(node, attrName) {
  	attrName = attrName.toLowerCase();
  	return node && node.attributes.find(attr => attr.name.value.toLowerCase() === attrName);
  }
docs: Returns attribute object with `attrName` name from given HTML node
  @param  {Node}   node
  @param  {String} attrName
  @return {Object}