A chapter marker provides a way to convey viewing milestones within the timeline of a player. It allows the segmentation of long videos into discrete segments.

A viewer can quickly hover over the cue point and can see the title of the chapter or section. Clicking on the cue point navigates you directly to that point of the video. These markers are rendered by the web player when a standard WebVTT text track is provided in the player embed code.

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## Create a .vtt file

Use the following steps to create a .vtt file:

  1. In a text editor, create a new file.

  2. Add information for cue timings and chapter titles. Cue identifiers are optional.

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AttributeDescription
**Cue timings**(Required) Specifies the time zone for the cue <br /><br /> **For example** : `00:04:44.000 --> 00:05:50.000` <br /><br /> The chapter will be displayed on the start of the zone.
**Chapter title**(Required) The title you want to display for the chapter. <br /><br /> **For example** : `Chapter 3`
**Cue identifier**(Optional) Used to identify the actual cue point <br /><br /> **For example** : `The attack`

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  1. Save the file. A .vtt file should always be saved in UTF8 encoding to prevent character issues.

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A .vtt file is subject to [cross-domain security restrictions](πŸ”—ο»Ώ) and therefore won't automatically load from another domain than the player.

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## Add the VTT track to your embed

After you have created the .vtt file with chapter cues, you need to add it to your player embed code. This gets added to the **tracks** configuration block with the **kind** set to **chapters**.

The full player embed code for above live example looks like the following example.

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(Script tags will be stripped)
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