Form: save it!

gistfile1.txt

// select form in Inspector and call:
localStorage._formData_ = JSON.stringify(Array.from($0.querySelectorAll('input')).map((el) => el.value));


// to restore data:
const _formData_ = JSON.parse(localStorage._formData_) || [];
Array.from($0.querySelectorAll('input')).forEach((input, id) => {
  input.value = _formData_[id];
  var event = document.createEvent("HTMLEvents");
  event.initEvent("input", true, true);
  input.dispatchEvent(event);
});