old_contents: # coding: utf-8
  # flake8: noqa
  from wtforms.widgets.html5 import *
  from wtforms.fields.html5 import *
  
  from wtforms.widgets.core import Input
  
  # wtforms missing DateInput
  
  class DateInput(Input):
      input_type = 'date'
  
new_contents: # coding: utf-8
  # flake8: noqa
  from wtforms.widgets.html5 import *
  from wtforms.fields.html5 import *
  
subject: Remove DateInput. #81