public function withHtml(string $name, string $label, string $containerElementCssSelector = null)
    {
        $this->contentGroup->htmlAreas[$name] = [
            'name'     => $name,
            'label'    => $label,
            'selector' => $containerElementCssSelector,
            'order'    => $this->order++,
        ];

        return $this;
    }