Baseline Widely available
addTextTrack()
㯠HTMLMediaElement
ã¤ã³ã¿ã¼ãã§ã¤ã¹ã®ã¡ã½ããã§ãæ°ãã TextTrack
ãªãã¸ã§ã¯ãã使ããããããã®ã¡ãã£ã¢è¦ç´ ã«è¿½å ãã¾ãããã®ã¡ã½ããã¯ã addtrack
ã¤ãã³ãããã®ã¡ãã£ã¢è¦ç´ ã® textTracks
ã§çºè¡ãã¾ãããã®ã¡ã½ããã¯ã TextTrackList
ã¤ã³ã¿ã¼ãã§ã¤ã¹ã§ã¯ä½¿ç¨ã§ãã¾ããã HTMLMediaElement
ã§ã®ã¿ä½¿ç¨ã§ãã¾ãã
addTextTrack(kind)
addTextTrack(kind, label)
addTextTrack(kind, label, language)
弿°
kind
æååã§ã TextTrack.kind
ãããã㣠(subtitles
, captions
, descriptions
, chapters
, metadata
) ã表ãã¾ãã
label
æååã§ã TextTrack.label
ããããã£ã表ãã¾ãã
language
æååã§ã TextTrack.language
ããããã£ã表ãã¾ãã
æ°ãã使ããã TextTrack
ãªãã¸ã§ã¯ãã§ãã
ãªãã
ä¾ãã®ä¾ã§ã¯ãæ°ãã TextTrack
ãã kind
ã "subtitles"
ã«è¨å®ãã¦è¿½å ããããã«æ°ãã VTTCue
ã追å ãã¦ãã¾ãã
const video = document.querySelector("video");
const newTrack = video.addTextTrack("subtitles");
newTrack.addCue(new VTTCue(3, 6, "Hello world!"));
console.log(newTrack.cues[0].text);
// "Hello world!"
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