Documented BoundField.label_tag

        >>> str(f['subject'].errors)

        ''

.. method:: BoundField.label_tag(contents=None, attrs=None)

To separately render the label tag of a form field, you can call its

``label_tag`` method::

    >>> f = ContactForm(data)

    >>> print(f['message'].label_tag())

    <label for="id_message">Message</label>

Optionally, you can provide the ``contents`` parameter which will replace the

auto-generated label tag. An optional ``attrs`` dictionary may contain

additional attributes for the ``<label>`` tag.

.. method:: BoundField.css_classes()

When you use Django's rendering shortcuts, CSS classes are used to