The <track> element defines text tracks, such as subtitles or captions, for <audio> and <video> elements.
This text should be visible as the related media source it playing, and are formatted in the WebVTT (.vtt) format.
<video>
<source src="common_html_elements.mp4" type="video/mp4">
<track src="english_subtitles.vtt" kind="subtitles" srclang="en" label="English">
<track src="spanish_subtitles.vtt" kind="subtitles" srclang="es" label="Spanish">
</video>