langchain/chains/natbot/crawler.py/Crawler/scroll
class Crawler:    def scroll(self, direction: str) -> None:
        if direction == "up":
            self.page.evaluate(
                "(document.scrollingElement || document.body).scrollTop = (document.scrollingElement || document.body).scrollTop - window.innerHeight;"
            )
        elif direction == "down":
            self.page.evaluate(
                "(document.scrollingElement || document.body).scrollTop = (document.scrollingElement || document.body).scrollTop + window.innerHeight;"
            )