Method once

playwright/sync_api/_generated.py:13996–14000

This event is not emitted.

(
        self, event: Literal["backgroundpage"], f: typing.Callable[["Page"], "None"]
    )

    @typing.overload
    def once(
        self, event: Literal["backgroundpage"], f: typing.Callable[["Page"], "None"]
    ) -> None:
        """
        This event is not emitted."""

    @typing.overload
    def once(