HTML Nested Lists

<div>Preceding text</div>

<ol type="I">
    <li>List Item 1</li>
    <ol type="a">
        <li>Nested Item 1.1</li>
        <li>Nested Item 1.2</li>
    </ol>
    <li>List Item 2</li>
    <ol type="1">
        <li>Nested Item 2.1</li>
        <li>Nested Item 2.2</li>
        <ul type="circle">
            <li>Nested Item 2.2.1</li>
            <li>Nested Item 2.2.2</li>
            <ul type="disc">
                <li>Nested Item 2.2.2.1</li>
                <li>Nested Item 2.2.2.2</li>
            </ul>
            <li>Nested Item 2.2.3</li>
        </ul>
        <li>Nested Item 2.3</li>
    </ol>
    <li>List Item 3</li>
    <ul type="disc">
        <li>Nested Item 3.1</li>
        <li>Nested Item 3.2</li>
        <li>Nested Item 3.3</li>
    </ul>
</ol>