.net 8 RC2 blazor dialogタグ

<button class="btn btn-primary" onclick="dlg.showModal()">ダイアログ表示</button>
<br/>
<hr/>
<pre>@Message</pre>
<hr/>
<dialog id="dlg" @onclose="OnDialog_Close" @oncancel="OnDialog_Cancel">
    <form method="dialog">
        <table>
            <tr>
                <td><span style="font-size:24pt;font-weight:bold">Hello World</span></td>
            </tr>
            <tr>
                <td> </td>
            </tr>
            <tr>
                <td>
                    <button class="btn btn-primary" @onclick="OnOK_Click">OK</button>
                </td>
            </tr>
        </table>
    </form>
</dialog>

@code {
    protected string Message = "";
    int cnt;
    protected override void OnInitialized() {
        cnt = 1;
    }
    protected void OnOK_Click() {
        Message += $"OK Button Click({cnt})->";
    }
    protected void OnDialog_Close() {
        Message += $"Dialog Close({cnt}) ";
        cnt++;
    }
    protected void OnDialog_Cancel() {
        Message += $"Dialog Cancel({cnt})->";
    }
}