revision:
The srclang attribute is used to specify the language of the track text. The srclang attribute can be applied on the <track>element
Note: srclang attribute is required with kind = “subtitles”.
<track src="subtitles_en.vtt" kind="subtitles" srclang="en">></track>
language_code specifies a two-letter language code that specifies the language of the track text data
<video style=margin-left:3vw;" width="340" height="220" controls>
<source src="../pics/Wuzhen-20-10_02.mp4" type="video/mp4">
<track src="some_video_subtitles.srt" kind="subtitles" srclang="en" label="English_subs">
</video>
<audio style="margin-left:3vw;" controls>
<source src = "../pics/horse.wav">
<track src = "subtitles.vtt" kind = "subtitles" srclang = "en" label =" English">
<p class="spec">:The browser doesnot support the file</p>
</audio>