You will not be able to embed just a portion of a document in an iframe with just HTML.
You will have to write some JS code to poll that site and extract just the desired content.
But, have you noticed that there is a published websocket? You may also try to get the data via JS: wss://realnaps.com:3000/socket.io/?EIO=3&transport=websocket&sid=tXNlXGWrZl-pipLxAMR_
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…