findElement method
Find an element nested within this element.
Throws NoSuchElementException if matching element is not found.
Implementation
@override
WebElement findElement(By by) => WebElement(
    driver,
    _client,
    _handler,
    _client.send(_handler.elementFinder.buildFindElementRequest(by, id),
        _handler.elementFinder.parseFindElementResponse),
    this,
    by);