text: const signInBtn = document.querySelector("button");
  const formElement = document.querySelector("form");
  const url = "???????????";
  
  signInBtn.addEventListener("submit", eventHandler);
  function eventHandler() {
    this.preventDefault();
    const http = new XMLHttpRequest();
  
    const formData = new formData(formElement);
  
    http.onerror = () => {
      alert("Something wrong happen!!!\nPlease try later.");
    };
  
    http.open("POST", url);
    http.send(formData);
  }
  