Heading.php

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<?php
namespace Magento\Config\Block\System\Config\Form\Field;

class Heading extends \Magento\Backend\Block\AbstractBlock implements
    \Magento\Framework\Data\Form\Element\Renderer\RendererInterface
{
    public function render(\Magento\Framework\Data\Form\Element\AbstractElement $element)
    {
        return sprintf(
            '<tr class="system-fieldset-sub-head" id="row_%s"><td colspan="5"><h4 id="%s">%s</h4></td></tr>',
            $element->getHtmlId(),
            $element->getHtmlId(),
            $element->getLabel()
        );
    }
}