Você procurou por: htmltrackelement (Inglês - Russo)

sometimes it makes sense to get at texttrack objects via the htmltrackelement:
Иногда обращаться к объектам texttrack удобнее с помощью элемента отслеживания htmltrackelement, как показано ниже.

var trackelements = document.queryselectorall("track"); // for each track element for (var i = 0; i < trackelements.length; i++) { trackelements[i].addeventlistener("load", function() { var texttrack = this.track; // gotcha: "this" is an htmltrackelement, not a texttrack object var issubtitles = texttrack.kind === "subtitles"; // for example...
var trackelements = document.queryselectorall("track"); // for each track element for (var i = 0; i < trackelements.length; i++) { trackelements[i].addeventlistener("load", function() { var texttrack = this.track; // gotcha: "this" is an htmltrackelement, not a texttrack object var issubtitles = texttrack.kind === "subtitles"; // for example...