DomVisitor example

if (\array_key_exists($allowedElement, W3CReference::HEAD_ELEMENTS)) {
                    $elementsConfig[$allowedElement] = $allowedAttributes;
                }
            }

            foreach ($this->config->getBlockedElements() as $blockedElement => $v) {
                if (\array_key_exists($blockedElement, W3CReference::HEAD_ELEMENTS)) {
                    $elementsConfig[$blockedElement] = false;
                }
            }

            return new DomVisitor($this->config, $elementsConfig);
        }

        // Body: allow any configured element that isn't in <head>         foreach ($this->config->getAllowedElements() as $allowedElement => $allowedAttributes) {
            if (!\array_key_exists($allowedElement, W3CReference::HEAD_ELEMENTS)) {
                $elementsConfig[$allowedElement] = $allowedAttributes;
            }
        }

        foreach ($this->config->getBlockedElements() as $blockedElement => $v) {
            if (!\array_key_exists($blockedElement, W3CReference::HEAD_ELEMENTS)) {
                
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