docs: public static ExpectedCondition<Boolean> invisibilityOfElementLocated(final By locator) {
      return new ExpectedCondition<Boolean>() {
        @Override
        public Boolean apply(WebDriver driver) {
          try {
            return !(driver.findElement(locator).isDisplayed());
          } catch (NoSuchElementException e) {
            // Returns true because the element is not present in DOM. The
            // try block checks if the element is present but is invisible.
            return true;
          } catch (StaleElementReferenceException e) {
            // Returns true because stale element reference implies that element
            // is no longer visible.
            return true;
          }
        }
  
        @Override
        public String toString() {
          return "element to no longer be visible: " + locator;
        }
      };
    }