JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdn.jsdelivr.net/npm/sweetalert2@9"></script>
<script src="https://cdn.jsdelivr.net/npm/promise-polyfill@8/dist/polyfill.js"></script>

JavaScript

Swal.fire({
          icon: "question",
          showCancelButton: true,
          confirmButtonColor: "#1976d2",
          cancelButtonText: "No",
          confirmButtonText: "SĂ­",
          footer: "<button onclick='withoutread()' class='btn btn-info'>Test</button>"
  })

 function withoutread() {
    alert('dd')
  }