new_contents: #!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  
  from wdom.tag import NewTagClass as NewTag
  from wdom.tag import *
  
  css_files = [
      'https://fonts.googleapis.com/icon?family=Material+Icons',
      'https://code.getmdl.io/1.1.3/material.indigo-pink.min.css',
  ]
  js_files = [
      'https://code.getmdl.io/1.1.3/material.min.js',
  ]
  headers = []
  
  Button = NewTag('Button', bases=Button, class_='mdl-button mdl-js-button')
  DefaultButton = NewTag('DefaultButton', 'button', Button,
                         class_='mdl-button--raised')
  PrimaryButton = NewTag('PrimaryButton', 'button', DefaultButton,
                         class_='mdl-button--primary')
  SuccessButton = NewTag('SuccessButton', 'button', DefaultButton,
                         class_='mdl-button--accent')
  InfoButton = NewTag('InfoButton', 'button', Button,
                      class_='mdl-button--primary')
  WarningButton = NewTag('WarningButton', 'button', Button)
  DangerButton = NewTag('DangerButton', 'button', Button)
  LinkButton = NewTag('LinkButton', 'button', Button,
                      class_='mdl-button--accent')
  
  FormGroup = NewTag('FormGroup', 'div', Div, class_='mdl-textfield mdl-js-textfield')
  Input = NewTag('Input', 'input', Input, class_='mdl-textfield__input')
  Label = NewTag('Label', 'label', Label, class_='mdl-textfield__label')
  Textarea = NewTag('Textarea', 'textarea', Textarea, class_='mdl-textfield__input')
  Select = NewTag('Select', 'select', Select, class_='mdl-textfield__input')
  
  Table = NewTag('Table', 'table', Table, class_='mdl-data-table mdl-js-data-table')
  Th = NewTag('Th', 'th', Th, class_='mdl-data-table__cell--non-numeric')
  Td = NewTag('Td', 'td', Td, class_='mdl-data-table__cell--non-numeric')
  
subject: Add mdl theme