 }
    .red {
        background-color: red;
    }
    .green {
        background-color: green;
    }
    div {
        width: 100px;
        height: 50px;
    }
    slot {
        border: solid 10px red;
    }
    </style>
    <p>Test passes if you see a single 100px by 100px green box below.</p>
    <my-host></my-host>
    <div class="red"><slot><div class="green"></div></slot></div>
    <script>

    try {
        var shadowHost = document.querySelector('my-host');
        shadowRoot = shadowHost.attach