ⓘ track – supplementary media track NEW # T
element enables supplementary media tracks such as subtitle tracks and
caption tracks to be specified for
Permitted attributes #
- Any attributes permitted globally.
- The kind of timed track.
- "subtitles": Transcription
or translation of the dialogue in the soundtrack of the video or
audio stream; meant for users who have access to the soundtrack
but for whom it is not fully usable as intended (for example, for
users who do not understand the language of the soundtrack).
- "captions": Transcription or
translation of the dialogue, sound effects, relevant musical
cues, and other relevant aural information in the video or audio
stream; intended for cases where users do not have any access
at all to the soundtrack (for example, for users who are deaf or
for the case when the soundtrack is currently muted).
- "descriptions": Textual
descriptions of the visual component of a video; meant for use
with audio synthesis when the visual component is unavailable
(for example, for users who are blind, or for users who are
currently unable to view the screen on which the video is
displayed—for example, a user accessing the video while driving a
- "chapters": Chapter
- "metadata": Metadata content
meant for use from script.
Non-empty URL potentially surrounded by spaces
- The address of the timed track.
- The language of the timed track.
as defined in
label = string
- A user-readable title for the timed track.
"default" or "" (empty string) or empty
- Instructs the UA that the track is to be enabled if the user’s
preferences do not indicate that another track would be more
Additional constraints and admonitions #
Attribute label for element track
must have non-empty value.
The default attribute must not occur on more than one
track element within the same audio element or video element.
Permitted parent elements #