prompt.html

<html>
<head>
<style>body {font-family: sans-serif;} button {float:right; margin-left: 10px;} label { display: block; margin-bottom: 5px; width: 100%; } input {margin-bottom: 10px; padding: 5px; width: 100%; display:block;}</style>
<script>
document.addEventListener("DOMContentLoaded" () => {
  document.querySelector("#cancel").addEventListener("click", (e) => {
    debugger
    e.preventDefault()
    e.stopPropagation()
    window.close()
  })
  document.querySelector("form").addEventListener("submit", (e) => {
    e.preventDefault()
    e.stopPropagation()
    debugger
    window.electronAPI.send('prompt-response', document.querySelector("#val").value)
    window.close()
  })
})
</script>
</head>
<body>
<form>
  <label for="val">${arg.title}</label>
  <input id="val" value="${arg.val}" autofocus />
  <button id='ok'>OK</button>
  <button id='cancel'>Cancel</button>
</form>
</body>
</html>