<p><?=$block->escapeHtml(__('Your order number is: %1.',sprintf('<a href="%s" class="order-number"><strong>%s</strong></a>',$block->escapeUrl($block->getViewOrderUrl()),$block->getOrderId())),['a','strong'])?></p>
<?phpelse:?>
<p><?=$block->escapeHtml(__('Your order # is: <span>%1</span>.',$block->getOrderId()),['span'])?></p>
<?phpendif;?>
<p><?=$block->escapeHtml(__('We\'ll email you an order confirmation with details and tracking info.'))?></p>