static S embedYoutube_newer(S youtubeID, O... _) {
  ret embedYoutube_newer(youtubeID, 300, _);
}

static S embedYoutube_newer(S youtubeID, int w, O... _) {
  ret embedYoutube_newer(youtubeID, w, sixteenToNine(w), _);
}

static S embedYoutube_newer(S youtubeID, int w, int h, O... _) {
  bool loop;
  if (first(_) instanceof Bool) {
    loop = true;
    _ = dropFirst(_);
  }
  optPar bool autoPlay;
  
  youtubeID = extractYouTubeID(youtubeID);
  ret iframe(appendQueryToURL("https://www.youtube.com/embed/" + youtubeID,
      playlist := loop ? youtubeID : null,
      autoplay := autoPlay ? 1 : null,
      loop := loop ? 1 : 0),
    width := w,
    height := h,
    frameborder := 0,
    allow := "autoplay; encrypted-media",
    allowfullscreen := html_valueLessParam());
}

Began life as a copy of #1013735