HTML 5 <track> Tag
The HTML 5 <track> tag is used to specify external timed text tracks for media elements (i.e. the <video> element and the <audio> element). The text tracks specified with the <track> tag could include subtitles, captions, descriptions, chapters, and metadata.
Note that the <track> element was first introduced into HTML5 in late 2010 and therefore, browser support for this element may be limited for some time.
Example
This example demonstrates usage of the <video> tag.
Attributes
HTML tags can contain one or more attributes. Attributes are added to a tag to provide the browser with more information about how the tag should appear or behave. Attributes consist of a name and a value separated by an equals (=) sign, with the value surrounded by double quotes. Here's an example, style="color:black;".
There are 3 kinds of attributes that you can add to your HTML tags: Element-specific, global, and event handler content attributes.
The attributes that you can add to this tag are listed below.
Element-Specific Attributes
The following table shows the attributes that are specific to this tag/element.
| Attribute | Description | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| kind | Specifies the kind of text track. This attribute is an enumerated attribute.
The possible values for the "kind" attribute are:
|
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| src | Specifies the URL of the text track data. Required attribute. | ||||||||||||
| srclang | Specifies the language of the text track. The value must be a valid BCP 47 language tag. This attribute is required if the element's kind attribute is "subtitles". | ||||||||||||
| label | Provides a user-readable title for the track. | ||||||||||||
| default | Specifies that the track is to be enabled if the user's preferences do not indicate that another track would be more appropriate. There must not be more than one track element with the same parent node with the default attribute specified. |
Global Attributes
The following attributes are standard across all HTML 5 tags.
| accesskey | hidden | itemtype |
| class | id | lang |
| contenteditable | inert | spellcheck |
| contextmenu | itemid | style |
| dir | itemprop | tabindex |
| draggable | itemref | title |
| dropzone | itemscope | translate |
For a full explanation of these attributes, see HTML 5 global attributes.
Event Handler Content Attributes
Event handler content attributes enable you to invoke a script from within your HTML. The script is invoked when a certain "event" occurs. Each event handler content attribute deals with a different event.
Here are the standard HTML 5 event handler content attributes.
| onabort | onerror* | onmousewheel |
| onblur* | onfocus* | onpause |
| oncanplay | onformchange | onplay |
| oncanplaythrough | onforminput | onplaying |
| onchange | oninput | onprogress |
| onclick | oninvalid | onratechange |
| oncontextmenu | onkeydown | onreadystatechange |
| ondblclick | onkeypress | onscroll |
| ondrag | onkeyup | onseeked |
| ondragend | onload* | onseeking |
| ondragenter | onloadeddata | onselect |
| ondragleave | onloadedmetadata | onshow |
| ondragover | onloadstart | onstalled |
| ondragstart | onmousedown | onsubmit |
| ondrop | onmousemove | onsuspend |
| ondurationchange | onmouseout | ontimeupdate |
| onemptied | onmouseover | onvolumechange |
| onended | onmouseup | onwaiting |
For a full explanation of these attributes, see HTML 5 event handler content attributes.