s to current deck
  var deckEl = document.querySelector('.prettify-deck')
  var subDecks = deckEl.innerHTML.split('::').filter(Boolean)
  html = []
  subDecks.forEach((subDeck) => {
    html.push("<span class='prettify-subdeck'>" + subDeck + '</span>')
  })
  deckEl.innerHTML = html.join('&nbsp;/&nbsp;')
</script>
