No, you cannot use a tag to preconnect to a WebSocket destination.

The tag in HTML is designed to preconnect to HTTP/HTTPS destinations to improve the performance of subsequent requests. This preconnect feature works by establishing a connection to a specified host early in the page load process, which can reduce latency when resources (like CSS, JavaScript, or images) are requested from that host.

However, WebSockets work differently from traditional HTTP/HTTPS connections. A WebSocket connection is established using the WebSocket API in JavaScript, and it uses a different protocol (ws:// or wss://) compared to HTTP/HTTPS. As a result, the tag cannot be used to preconnect to a WebSocket server.

To optimize WebSocket connections, you would typically initiate the WebSocket connection in your JavaScript code after the page has loaded, like so: