Add '12/player.js'

12/player.js

@@ -0,0 +1,5 @@
+var track = document.querySelector("track");
+track.addEventListener('cuechange', function () {
+  let cues = track.track.activeCues;  // array of current cues
+  console.log("cuechange", cues, cues[0].text, cues[0].startTime, cues[0].endTime);
+});