src/Facebook/InstantArticles/Elements/Ad.php [184:209]:
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        if ($this->width) {
            $iframe->setAttribute('width', $this->width);
        }

        if ($this->height) {
            $iframe->setAttribute('height', $this->height);
        }

        // Ad markup
        if ($this->html) {
            // Here we do not care about what is inside the iframe
            // because it'll be rendered in a sandboxed webview
            $this->dangerouslyAppendUnescapedHTML($iframe, $this->html);
        } else {
            $iframe->appendChild($document->createTextNode(''));
        }

        return $figure;
    }

    /**
     * Overrides the Element::isValid().
     * @see Element::isValid().
     * @return true for valid Ad that contains valid src or html, false otherwise.
     */
    public function isValid()
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src/Facebook/InstantArticles/Elements/Interactive.php [219:245]:
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        if ($this->width) {
            $iframe->setAttribute('width', $this->width);
        }

        if ($this->height) {
            $iframe->setAttribute('height', $this->height);
        }

        // Ad markup
        if ($this->html) {
            // Here we do not care about what is inside the iframe
            // because it'll be rendered in a sandboxed webview
            $this->dangerouslyAppendUnescapedHTML($iframe, $this->html);
        } else {
            $iframe->appendChild($document->createTextNode(''));
        }

        return $figure;
    }

    /**
     * Overrides the Element::isValid().
     *
     * @see Element::isValid().
     * @return true for valid Interactive that contains valid source or html, false otherwise.
     */
    public function isValid()
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