TypoScriptFrontendControllerHook.php

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<?php
namespace TYPO3\CMS\Rtehtmlarea\Hook\Frontend\Controller;
class TypoScriptFrontendControllerHook {

    public function contentPostProcOutput(array $params, \TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController $controller) {
        if (strpos($controller->content, 'textarea id="RTEarea') !== FALSE) {
            $userAgent = \TYPO3\CMS\Core\Utility\GeneralUtility::getIndpEnv('HTTP_USER_AGENT');
            $browserInfo = \TYPO3\CMS\Core\Utility\ClientUtility::getBrowserInfo($userAgent);
            if ($browserInfo['browser'] === 'msie' && $browserInfo['version'] > 10) {
                $controller->content = preg_replace('/<head([^>]*)>/', '<head$1>' . LF . '<meta http-equiv="X-UA-Compatible" content="IE=10" />', $controller->content);
            }
        }
    }
}