Saves any page forms in localStorage

save-form.js

// 407 bytes minified
{
  let ls = localStorage
  let loc = location
  let option = prompt('s/ave, c/lear, f/ill', 'f')
  let index = option[0] == 'h' ? 1 : 0
  let key = 'f:' + (index ? loc.host : loc.href)
  let elems = document.querySelectorAll('input:not([type="file"]),textarea,select')

  option[index] == 's' && ls.setItem(
    key,
    JSON.stringify(
      [...elems].map(el => [el.value, el.checked])
    )
  )

  option[index] == 'c' && ls.removeItem(key)

  JSON.parse(ls.getItem(key))
    .map(([value, checked], index) => {
      elems[index].value = value
      elems[index].checked = checked
      elems[index].dispatchEvent(new Event('change', { 'bubbles': true }))
    })
}

// add as a bookmark
// javascript:{let a=localStorage,b=location,c=prompt('s/ave, c/lear, f/ill','f'),d='h'==c[0]?1:0,e='f:'+(d?b.host:b.href),f=document.querySelectorAll('input:not([type="file"]),textarea,select');'s'==c[d]&&a.setItem(e,JSON.stringify([...f].map(g=>[g.value,g.checked]))),'c'==c[d]&&a.removeItem(e),JSON.parse(a.getItem(e)).map(([g,h],i)=>{f[i].value=g,f[i].checked=h,f[i].dispatchEvent(new Event('change',{bubbles:!0}))})}