New version. Add Material UI implementation with theme customization, about dialog, and news system

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<!-- catalog-only-start --><!-- ---
name: Switch
dirname: switch
-----><!-- catalog-only-end -->
<catalog-component-header>
<catalog-component-header-title slot="title">
# Switch
<!--*
# Document freshness: For more information, see go/fresh-source.
freshness: { owner: 'lizmitchell' reviewed: '2025-05-20' }
tag: 'docType:reference'
*-->
<!-- no-catalog-start -->
<!-- go/md-switch -->
<!-- [TOC] -->
<!-- external-only-start -->
**This documentation is fully rendered on the
[Material Web catalog](https://material-web.dev/components/switch/).**
<!-- external-only-end -->
<!-- no-catalog-end -->
[Switches](https://m3.material.io/components/switch)<!-- {.external} --> toggle the state
of an item on or off.
</catalog-component-header-title>
<img
class="hero"
src="images/switch/hero.webp"
alt="Two switches on a settings page for Wi-Fi and Bluetooth. The first is on and the second is off."
title="Switches on a settings page.">
</catalog-component-header>
* [Design article](https://m3.material.io/components/switch) <!-- {.external} -->
* [API Documentation](#api)
* [Source code](https://github.com/material-components/material-web/tree/main/switch)
<!-- {.external} -->
<!-- catalog-only-start -->
<!--
## Interactive Demo
{% playgroundexample dirname=dirname %}
-->
<!-- catalog-only-end -->
## Usage
Switches are similar to checkboxes, and can be unselected or selected.
<!-- no-catalog-start -->
<!-- Need to add image -->
<!-- no-catalog-end -->
<!-- Need to add catalog-include "figures/<component>/usage.html" -->
```html
<md-switch></md-switch>
<md-switch selected></md-switch>
```
### Icons
Icons can be used to visually emphasize the switch's selected state. Switches
can choose to display both icons or only selected icons.
<!-- no-catalog-start -->
<!-- Need to add image -->
<!-- no-catalog-end -->
<!-- Need to add catalog-include "figures/<component>/usage.html" -->
```html
<md-switch icons></md-switch>
<md-switch icons selected></md-switch>
<md-switch icons show-only-selected-icon></md-switch>
<md-switch icons show-only-selected-icon selected></md-switch>
```
### Label
Associate a label with a switch using the `<label>` element.
<!-- no-catalog-start -->
<!-- Need to add image -->
<!-- no-catalog-end -->
<!-- Need to add catalog-include "figures/<component>/usage.html" -->
```html
<label>
Wi-Fi
<md-switch selected></md-switch>
</label>
<label for="switch">Bluetooth</label>
<md-switch id="switch"></md-switch>
```
## Accessibility
Add an
[`aria-label`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-label)<!-- {.external} -->
attribute to switches without labels or switches whose labels need to be more
descriptive.
```html
<md-switch aria-label="Lights"></md-switch>
<label>
All
<md-switch aria-label="All notifications"></md-switch>
</label>
```
> Note: switches are not automatically labelled by `<label>` elements and always
> need an `aria-label`. See b/294081528.
## Theming
Switches supports [Material theming](../theming/README.md) and can be customized
in terms of color and shape.
### Tokens
Token | Default value
----------------------------------- | ------------------------------------------
`--md-switch-handle-color` | `--md-sys-color-outline`
`--md-switch-handle-shape` | `--md-sys-shape-corner-full`
`--md-switch-track-color` | `--md-sys-color-surface-container-highest`
`--md-switch-track-shape` | `--md-sys-shape-corner-full`
`--md-switch-selected-handle-color` | `--md-sys-color-on-primary`
`--md-switch-selected-track-color` | `--md-sys-color-primary`
* [All tokens](https://github.com/material-components/material-web/blob/main/tokens/_md-comp-switch.scss)
<!-- {.external} -->
### Example
<!-- no-catalog-start -->
<!-- Need to add image -->
<!-- no-catalog-end -->
<!-- Need to add catalog-include "figures/<component>/usage.html" -->
```html
<style>
:root {
/* System tokens */
--md-sys-color-primary: #006a6a;
--md-sys-color-on-primary: #ffffff;
--md-sys-color-outline: #6f7979;
--md-sys-color-surface-container-highest: #dde4e3;
/* Component tokens */
--md-switch-handle-shape: 0px;
--md-switch-track-shape: 0px;
}
</style>
<md-switch></md-switch>
<md-switch selected></md-switch>
```
<!-- auto-generated API docs start -->
## API
### MdSwitch <code>&lt;md-switch&gt;</code>
#### Properties
<!-- mdformat off(autogenerated might break rendering in catalog) -->
| Property | Attribute | Type | Default | Description |
| --- | --- | --- | --- | --- |
| `selected` | `selected` | `boolean` | `false` | Puts the switch in the selected state and sets the form submission value to the `value` property. |
| `icons` | `icons` | `boolean` | `false` | Shows both the selected and deselected icons. |
| `showOnlySelectedIcon` | `show-only-selected-icon` | `boolean` | `false` | Shows only the selected icon, and not the deselected icon. If `true`, overrides the behavior of the `icons` property. |
| `required` | `required` | `boolean` | `false` | When true, require the switch to be selected when participating in form submission.<br>https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/checkbox#validation |
| `value` | `value` | `string` | `'on'` | The value associated with this switch on form submission. `null` is submitted when `selected` is `false`. |
| `disabled` | | `boolean` | `undefined` | |
| `name` | | `string` | `undefined` | |
<!-- mdformat on(autogenerated might break rendering in catalog) -->
#### Methods
<!-- mdformat off(autogenerated might break rendering in catalog) -->
| Method | Parameters | Returns | Description |
| --- | --- | --- | --- |
| `formResetCallback` | _None_ | `void` | |
| `formStateRestoreCallback` | `state` | `void` | |
<!-- mdformat on(autogenerated might break rendering in catalog) -->
#### Events
<!-- mdformat off(autogenerated might break rendering in catalog) -->
| Event | Type | [Bubbles](https://developer.mozilla.org/en-US/docs/Web/API/Event/bubbles) | [Composed](https://developer.mozilla.org/en-US/docs/Web/API/Event/composed) | Description |
| --- | --- | --- | --- | --- |
| `input` | `InputEvent` | No | No | Fired whenever `selected` changes due to user interaction (bubbles and composed). |
| `change` | `Event` | No | No | Fired whenever `selected` changes due to user interaction (bubbles). |
<!-- mdformat on(autogenerated might break rendering in catalog) -->
<!-- auto-generated API docs end -->