def __delitem__(self, key):
            self.attrs.pop(key, None)
L{LocationLightning} should not block out non-IVisible stuff from a
dataset/ETHPy150Open mtlevolio/pylinkchecker/pylinkchecker/bs4/element.py/Tag.__delitem__--crossover with--dataset/ETHPy150Open twisted/imaginary/imaginary/test/test_illumination.py/DarknessTestCase.test_nonVisibilityUnaffected