docs: @Nonnull
    public static JSAssocArray createUpdateParam (@Nonnull @Nonempty final String sFieldID,
                                                  @Nonnull final IHCNode aHCNode)
    {
      return new JSAssocArray ().add ("id", sFieldID).add ("html", HCRenderer.getAsHTMLStringWithoutNamespaces (aHCNode));
    }