uart.js connect directly to espruino?

Hello,

i'm playing with the uart.js lib to connect an espruino to a webpage.
Is it possible to connect to an espruino by command line (js) without the menu "bt4 or webserial", if i know the name of my espruino?
and can i use connection.close() (line 3) to disconnect the espruino from the page (without closing the webpage)? (to update the code in the webIDE)

i use this example

let connection;
    if (connection) {
      connection.close();
      connection = undefined;
    }
    UART.connect((c) => {
      if (!c) {
        console.log("Pas de connexion");
        alert("Impossible de se connecter");
        return;
      }
      console.log("Connecté");
      connection = c;
      // Handle the data we get back, and call 'onLine'
      // whenever we get a line
      resultData = "";
      connection.on("data", (d) => {
        resultData = d;
        resultData  = resultData.replace(/\r\n|>|\[J/g, '');
        if (resultData.length > 1) {
          document.querySelector("article").innerHTML = resultData;
        }
      });
    });

regards

é.