Neos\FluidAdaptor\Core\ViewHelper\AbstractTagBasedViewHelper::initialize PHP Method

    public function initialize()
    {
        parent::initialize();
        $this->tag->reset();
        $this->tag->setTagName($this->tagName);
        if ($this->hasArgument('additionalAttributes') && is_array($this->arguments['additionalAttributes'])) {
            $this->tag->addAttributes($this->arguments['additionalAttributes']);
        }
        if ($this->hasArgument('data') && is_array($this->arguments['data'])) {
            foreach ($this->arguments['data'] as $dataAttributeKey => $dataAttributeValue) {
                $this->tag->addAttribute('data-' . $dataAttributeKey, $dataAttributeValue);
            }
        }
        if (isset(self::$tagAttributes[get_class($this)])) {
            foreach (self::$tagAttributes[get_class($this)] as $attributeName) {
                if ($this->hasArgument($attributeName) && $this->arguments[$attributeName] !== '') {
                    $this->tag->addAttribute($attributeName, $this->arguments[$attributeName]);
                }
            }
        }
    }