---
title: Timeline Attributes
framework: professional-video-applications
role: article
path: professional-video-applications/timeline-attributes
---

# Timeline Attributes

## Timeline Attributes

Timeline Attributes Define characteristics of a timeline.

Overview

The `sequence` element creates a new timeline. Use the timeline attributes to define its characteristics. Use the attributes with the `clip` element, when it appears as a top-level story element, to describe a browser clip in an event. The timeline attributes are:

| Attribute | Description | | --- | --- | | `format` | A reference to the video format defined by the `format` element. | | `tcStart` | The timecode origin represented as a time value. See [Timing Attributes](/documentation/professional-video-applications/timing-attributes). | | `tcFormat` | The timecode display format, either drop frame (`DF`) or nondrop frame (`NDF`, which is the default). |