code: function replacementForNode (node) {
    var rule = this.rules.forNode(node)
    var content = process.call(this, node)
    var whitespace = node.flankingWhitespace
    if (whitespace.leading || whitespace.trailing) content = content.trim()
    return (
      whitespace.leading +
      rule.replacement(content, node, this.options) +
      whitespace.trailing
    )
  }
docs: Converts an element node to its Markdown equivalent
  @private
  @param {HTMLElement} node The node to convert
  @returns A Markdown representation of the node
  @type String