text: function usernameIsBusy() {
      document.getElementById("usernameIsBusy").style.display = "inline-block";
  }
  
  function emailIsBusy() {
      document.getElementById("emailIsBusy").style.display = "inline-block";
  }
  
  function passwordMismatch() {
      let form = document.getElementById("signUpForm");
      let password = document.getElementById("inputPassword").value;
      let repeatedPassword = document.getElementById("inputRepeatPassword").value;
      if (password !== repeatedPassword) {
          document.getElementById("passwordMismatch").style.display = "inline-block";
      } else {
          form.submit();
      }
  }