document$.subscribe(function() {
  var feedback = document.forms.feedback
  if (typeof feedback === "undefined") return

  feedback.hidden = false

  feedback.addEventListener("submit", function(ev) {
    ev.preventDefault()

    var page = document.location.pathname
    var data = ev.submitter.getAttribute("data-md-value")

    posthog.capture("page_feedback", { page, data })

    feedback.firstElementChild.disabled = true

    var note = feedback.querySelector(
      ".md-feedback__note [data-md-value='" + data + "']"
    )
    if (note)
      note.hidden = false
  })
}