---
title: Default text box
framework: quicktime-file-format
role: symbol
role_heading: Data field
path: quicktime-file-format/subtitle_sample_description/default_text_box
---

# Default text box

A 64-bit rectangle that specifies an area to receive text (each 16 bits indicate top, left, bottom, and right, respectively) within the subtitle track.

## Overview

Overview This rectangle must fill the track header dimensions exactly; that is, top is 0, left is 0, bottom is the height of the subtitle track header, and right is the width of the subtitle track header. See Subtitle track header size and placement.

## See Also

### Data fields

- [Display flags](quicktime-file-format/subtitle_sample_description/display_flags.md)
- [Reserved](quicktime-file-format/subtitle_sample_description/reserved.md)
- [Reserved](quicktime-file-format/subtitle_sample_description/reserved2.md)
- [Reserved](quicktime-file-format/subtitle_sample_description/reserved3.md)
- [Reserved](quicktime-file-format/subtitle_sample_description/reserved4.md)
- [Font identifier](quicktime-file-format/subtitle_sample_description/font_identifier.md)
- [Font face](quicktime-file-format/subtitle_sample_description/font_face.md)
- [Font size](quicktime-file-format/subtitle_sample_description/font_size.md)
- [Foreground color](quicktime-file-format/subtitle_sample_description/foreground_color.md)
- [Font table](quicktime-file-format/subtitle_sample_description/font_table.md)