<templates>
    <t t-name="mass_mailing.AddSnippetDialog" t-inherit="html_builder.AddSnippetDialog" t-inherit-mode="primary">
        <xpath expr="//iframe[@t-ref]" position="attributes">
            <attribute name="t-att-sandbox">
                this.isBrowserSafari ? 'allow-same-origin allow-scripts' : 'allow-same-origin'
            </attribute>
        </xpath>
    </t>
</templates>
