te
        and tag substitution in the current block.

        3. If a style attribute was specified update self.parameters with the
        corresponding style parameters; if there are any style parameters
        remaining add them to self.attributes (existing attribute list entries
        take precedence).

        4. Set named positional attributes in self.attributes if self.posattrs
        was specified.

        5. Finally self.parameters is updated with any corresponding parameters
        specified in attrs.

        c