class_docstr: A string holding a valid HTML color such as 'blue', '#060482', '#A80'
class_docstr_tok: ["A","string","holding","a","valid","HTML","color","such","as","'blue","'",",","'","#","060482","'",",","'","#","A80","'"]
code: def validate(self, obj, value):
      if value is None and self.allow_none:
          return value
      if isinstance(value, str):
          if value.lower() in _color_names or _color_re.match(value):
              return value
          elif _color_hexa_re.match(value) or _color_rgbhsl_re.match(
              value
          ):
              return value
      self.error(obj, value)
  
imports: from collections import namedtuple
  from collections.abc import Sequence
  import numbers
  import math
  import re
  import warnings
  from traitlets import Unicode, Int, CInt, Instance, Enum, List, Dict, Float, CFloat, Bool, Tuple, Undefined, TraitError, Union, TraitType, CaselessStrEnum
  from ipywidgets import widget_serialization
  from ipydatawidgets import DataUnion, NDArrayWidget, shape_constraints
  import numpy
label_desc: Use image node_id 1 for calling the Color obj's underlying member method code with example usage: obj.validate(obj, value) and returns: value, value, value