class_docstr: Widget that can be inserted into the DOM
docstr: Removes a class from the top level element of the widget.
  
  Doesn't remove the class if it doesn't exist.
code: def remove_class(self, className):
      """
      Removes a class from the top level element of the widget.
  
      Doesn't remove the class if it doesn't exist.
      """
      if className in self._dom_classes:
          self._dom_classes = [
              c for c in self._dom_classes if c != className
          ]
      return self
  
file_path: catboost/contrib/python/ipywidgets/py2/ipywidgets/widgets/domwidget.py
imports: from traitlets import Unicode
  from .widget import Widget, widget_serialization
  from .trait_types import InstanceDict, TypedTuple
  from .widget_layout import Layout
  from .widget_style import Style
label_desc: Use image node_id 2 for calling the DOMWidget obj's underlying member method code with example usage: obj.remove_class(className) and returns: self