<twig:DivComponent>
    Content 1
    <twig:DivComponent>
        Content 2
        <twig:DivComponent>
            Content 3
            <twig:block name="foo">Override foo3</twig:block>
        </twig:DivComponent>
    </twig:DivComponent>
    <twig:block name="foo">Override foo1</twig:block>
</twig:DivComponent>