如果您為視頻提供兩個字幕軌道，請使用默認屬性來標識要啟用的軌道。
示例
您可以嘗試以下代碼來實現軌道的默認屬性 –
<!DOCTYPE HTML>
<html>
<body>
<video width = "300" height = "200" controls autoplay>
<source src = "/html5/foo.ogg" type = "video/ogg" />
<source src = "/html5/foo.mp4" type = "video/mp4" />
<track src = "subtitles_en.vtt" kind = "subtitles" srclang = "en" label = "English">
<track src = "subtitles_ru.vtt" kind = "subtitles" srclang = "ru" label = "Russia" default>
Your browser does not support the video element.
</video>
</body>
</html>
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