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# Header
A simple header widget which docks itself to the top of the parent container.
!!! note
The application title which is shown in the header is taken from the [`title`][textual.app.App.title] and [`sub_title`][textual.app.App.sub_title] of the application.
- [ ] Focusable
- [ ] Container
## Example
The example below shows an app with a `Header`.
=== "Output"
```{.textual path="docs/examples/widgets/header.py"}
```
=== "header.py"
```python
--8<-- "docs/examples/widgets/header.py"
```
This example shows how to set the text in the `Header` using `App.title` and `App.sub_title`:
=== "Output"
```{.textual path="docs/examples/widgets/header_app_title.py"}
```
=== "header_app_title.py"
```python
--8<-- "docs/examples/widgets/header_app_title.py"
```
## Reactive Attributes
| Name | Type | Default | Description |
| ------ | ------ | ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `tall` | `bool` | `True` | Whether the `Header` widget is displayed as tall or not. The tall variant is 3 cells tall by default. The non-tall variant is a single cell tall. This can be toggled by clicking on the header. |
## Messages
This widget posts no messages.
## Bindings
This widget has no bindings.
## Component Classes
This widget has no component classes.
---
::: textual.widgets.Header
options:
heading_level: 2
|
