def __init__(self, controller_config, sync_connection_manager=None,
               snapshot_service=None):
    self._config = controller_config
    self._state = ControllerState.DEAD
    self._sync_connection_manager = sync_connection_manager
    self._snapshot_service = snapshot_service
Finds an element within this element's children by their class name.
dataset/ETHPy150Open ucb-sts/sts/sts/entities/controllers.py/ControllerAbstractClass.__init__--crossover with--dataset/ETHPy150Open apiad/sublime-browser-integration/selenium/webdriver/remote/webelement.py/WebElement.find_element_by_class_name