'', 'scrolling' => 'no', 'style' => ['border' => '0'] ]; protected $iframeAttributes = ['data-s9e-livepreview-ignore-attrs', 'data-s9e-livepreview-postprocess', 'onload', 'scrolling', 'src', 'style']; protected function getContentTemplate() { $attributes = $this->mergeAttributes($this->defaultIframeAttributes, $this->getFilteredAttributes()); return ''; } protected function getFilteredAttributes() { return \array_intersect_key($this->attributes, \array_flip($this->iframeAttributes)); } }