Set the *string*-attribute of the first textarea element
        specified by ``data`` (i.e. set the text of a textarea).

        :param data: Dict of ``{name: value, ...}``.
            The textarea whose *name*-attribute is ``name`` will have
            its *string*-attribute set to ``value``.

def set_textarea(self, data):
        """Set the *string*-attribute of the first textarea element
        specified by ``data`` (i.e. set the text of a textarea).

        :param data: Dict of ``{name: value, ...}``.
            The textarea whose *name*-attribute is ``name`` will have
            its *string*-attribute set to ``value``.
        """
        for (name, value) in data.items():
            t = self.form.find("textarea", {"name": name})
            if not t:
                raise InvalidFormMethod("No textarea named " + name)
            t.string = value