FrontendHooks.php

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<?php
namespace TYPO3\CMS\Frontend\Hooks;

class FrontendHooks {

    public function hook_previewInfo($params, $pObj) {
        if ($pObj->fePreview !== 1) {
            return;
        }
        $message = '';
        if ($pObj->config['config']['message_preview']) {
            $message = $pObj->config['config']['message_preview'];
        } else {
            $message = '<div id="typo3-previewInfo" style="position: absolute; top: 20px; right: 20px; border: 2px solid #000; padding: 5px 5px; background: #f00; font: 1em Verdana; color: #000; font-weight: bold; z-index: 10001">PREVIEW!</div>';
        }
        return $message;
    }

}