docstr: Sets the container `x` refers to. "container" spans the entire
  `width` of the plot. "paper" refers to the width of the
  plotting area only.
  
  The 'xref' property is an enumeration that may be specified as:
    - One of the following enumeration values:
          ['container', 'paper']
  
  Returns
  -------
  Any
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code: def xref(self):
      """
      Sets the container `x` refers to. "container" spans the entire
      `width` of the plot. "paper" refers to the width of the
      plotting area only.
  
      The 'xref' property is an enumeration that may be specified as:
        - One of the following enumeration values:
              ['container', 'paper']
  
      Returns
      -------
      Any
      """
      return self["xref"]
  
imports: from plotly.basedatatypes import BaseLayoutHierarchyType
  import copy
label_desc: Use image node_id 13 for calling the Title obj's underlying member method code with example usage: obj.xref() and returns: self