'Remember the slots provided at this position in the DOM.
During the rendering of children of this node, slots with names in
C{slots} will be rendered as their corresponding values.
@return: C{self}. This enables the idiom C{return tag.fillSlots(...)} in
renderers.'

def fillSlots(self, **slots):

    if (self.slotData is None):
        self.slotData = {}
    self.slotData.update(slots)
    return self
