Hidden.php

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<?php
namespace Magento\Framework\Data\Form\Element;

use Magento\Framework\Escaper;

class Hidden extends AbstractElement
{
    public function __construct(
        Factory $factoryElement,
        CollectionFactory $factoryCollection,
        Escaper $escaper,
        $data = []
    ) {
        parent::__construct($factoryElement, $factoryCollection, $escaper, $data);
        $this->setType('hidden');
        $this->setExtType('hiddenfield');
    }

    public function getDefaultHtml()
    {
        $html = $this->getData('default_html');
        if ($html === null) {
            $html = $this->getElementHtml();
        }
        return $html;
    }
}