<track>: The Embed Text Track element - HTML: Hypertext Markup Language
srclang language of the track text data.
...if the kind attribute is set to subtitles, then srclang must be defined.
... a media element cannot have more than one track with the same kind, srclang, and label.
...And 2 more matches

Accessible multimedia - Learn web development
furthermore, use srclang to tell the browser what language you have written the subtitles in.
... here's an example: <video controls> <source src="example.mp4" type="video/mp4"> <source src="example.webm" type="video/webm"> <track kind="subtitles" src="subtitles_en.vtt" srclang="en"> </video> this will result in a video that has subtitles displayed, kind of like this: for more details, please read adding captions and subtitles to html5 video.

Video and audio content - Learn web development
further, use srclang to tell the browser what language you have written the subtitles in.
... here's an example: <video controls> <source src="example.mp4" type="video/mp4"> <source src="example.webm" type="video/webm"> <track kind="subtitles" src="subtitles_en.vtt" srclang="en"> </video> this will result in a video that has subtitles displayed, kind of like this: for more details, please read adding captions and subtitles to html5 video.

HTMLMedia​Element​.textTracks - Web APIs
examples we start with a <video> that has several <track> children <video controls poster="/images/sample.gif"> <source src="sample.mp4" type="video/mp4"> <source src="sample.ogv" type="video/ogv"> <track kind="captions" src="samplecaptions.vtt" srclang="en"> <track kind="descriptions" src="sampledescriptions.vtt" srclang="en"> <track kind="chapters" src="samplechapters.vtt" srclang="en"> <track kind="subtitles" src="samplesubtitles_de.vtt" srclang="de"> <track kind="subtitles" src="samplesubtitles_en.vtt" srclang="en"> <track kind="subtitles" src="samplesubtitles_ja.vtt" srclang="ja"> <track kind="subtitles" src="samplesubtitles_oz.
...vtt" srclang="oz"> <track kind="metadata" src="keystage1.vtt" srclang="en" label="key stage 1"> <track kind="metadata" src="keystage2.vtt" srclang="en" label="key stage 2"> <track kind="metadata" src="keystage3.vtt" srclang="en" label="key stage 3"> </video> the htmlmediaelement.texttracks returns a texttrackslist thru which we can iterate.

Adding captions and subtitles to HTML5 video - Developer guides
titles in three different languages — english, german, and spanish — so we will reference all three of the relevant vtt files by adding <track> elements inside our html5 <video> element: <video id="video" controls preload="metadata"> <source src="video/sintel-short.mp4" type="video/mp4"> <source src="video/sintel-short.webm" type="video/webm"> <track label="english" kind="subtitles" srclang="en" src="captions/vtt/sintel-en.vtt" default> <track label="deutsch" kind="subtitles" srclang="de" src="captions/vtt/sintel-de.vtt"> <track label="español" kind="subtitles" srclang="es" src="captions/vtt/sintel-es.vtt"> </video> as you can see, each <track> element has the following attributes set: kind is given a value of subtitles, indicating the type of content the files contain l...
... srclang indicates what language each subtitle files' contents are in.

HTMLTrackElement - Web APIs
htmltrackelement.srclang is a domstring that reflects the srclang html attribute, indicating the language of the text track data.

Audio and Video Delivery - Developer guides
r info see cross browser audio basics (html5 audio in detail) html video <video controls width="640" height="480" poster="initialimage.png" autoplay muted> <source src="videofile.mp4" type="video/mp4"> <!-- fallback for browsers that don't support mp4 --> <source src="videofile.webm" type="video/webm"> <!-- specifying subtitle files --> <track src="subtitles_en.vtt" kind="subtitles" srclang="en" label="english"> <track src="subtitles_no.vtt" kind="subtitles" srclang="no" label="norwegian"> <!-- fallback for browsers that don't support video tag --> <a href="videofile.mp4">download video</a> </video> the code above creates a video player of dimensions 640x480 pixels, displaying a poster image until the video is played.

HTML attribute reference - HTML: Hypertext Markup Language
srcdoc <iframe> srclang <track> srcset <img>, <source> one or more responsive image candidates.