Bootstrap5 消息弹窗(Toasts)3

<div class="toast fade show" role="alert" aria-live="assertive" aria-atomic="true">
    <div class="toast-header">
    <svg class="bd-placeholder-img rounded me-2" width="20" height="20" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" preserveAspectRatio="xMidYMid slice" focusable="false"><rect width="100%" height="100%" fill="#007aff"></rect></svg>
    <strong class="me-auto">弹窗实例</strong>
    <small class="text-muted">2 秒前</small>
    <button type="button" class="btn-close" data-bs-dismiss="toast" aria-label="Close"></button>
    </div>
    <div class="toast-body">
    这是第一个消息
    </div>
</div>
</div>