docs: @Nonnull
    @ReturnsMutableCopy
    public static ICommonsList <IMicroElement> getChildElements (@Nonnull final IMicroElement aElement,
                                                                 @Nonnull final EHTMLElement eHTMLElement)
    {
      ValueEnforcer.notNull (aElement, "element");
      ValueEnforcer.notNull (eHTMLElement, "HTMLElement");
  
      final ICommonsList <IMicroElement> ret = new CommonsArrayList <> ();
      ret.addAll (aElement.getAllChildElements (eHTMLElement.getElementName ()));
      ret.addAll (aElement.getAllChildElements (eHTMLElement.getElementNameUpperCase ()));
      return ret;
    }