code: public static ExpectedCondition<List<WebElement>> presenceOfNestedElementsLocatedBy(
      final By parent,
      final By childLocator) {
      return new ExpectedCondition<List<WebElement>>() {
  
        @Override
        public List<WebElement> apply(WebDriver driver) {
          List<WebElement> allChildren = driver.findElement(parent).findElements(childLocator);
  
          return allChildren.isEmpty() ? null : allChildren;
        }
  
        @Override
        public String toString() {
          return String.format("visibility of element located by %s -> %s", parent, childLocator);
        }
      };
    }
docs: An expectation for checking child WebElement as a part of parent element to present
  
  @param parent     used to check parent element. For example table with locator
  By.xpath("//table")
  @param childLocator used to find child element. For example td By.xpath("./tr/td")
  @return subelement