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New version. Add Material UI implementation with theme customization, about dialog, and news system
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components-wiki/dialog.md
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components-wiki/dialog.md
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<!-- catalog-only-start --><!-- ---
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name: Dialogs
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dirname: dialog
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-----><!-- catalog-only-end -->
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<catalog-component-header image-align="start">
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<catalog-component-header-title slot="title">
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# Dialogs
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<!--*
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# Document freshness: For more information, see go/fresh-source.
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freshness: { owner: 'lizmitchell' reviewed: '2025-05-20' }
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tag: 'docType:reference'
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*-->
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<!-- no-catalog-start -->
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<!-- go/md-dialog -->
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<!-- [TOC] -->
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<!-- external-only-start -->
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**This documentation is fully rendered on the
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[Material Web catalog](https://material-web.dev/components/dialog/)**
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<!-- external-only-end -->
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<!-- no-catalog-end -->
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[Dialogs](https://m3.material.io/components/dialogs)<!-- {.external} --> provide
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important prompts in a user flow.
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</catalog-component-header-title>
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<img class="hero" src="images/dialog/hero.webp" alt="A dialog displaying phone ringtone options."
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title="A dialog">
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</catalog-component-header>
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* [Design article](https://m3.material.io/components/dialogs) <!-- {.external} -->
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* [API Documentation](#api)
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* [Source code](https://github.com/material-components/material-web/tree/main/dialog)
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<!-- {.external} -->
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<!-- catalog-only-start -->
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<!--
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## Interactive Demo
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{% playgroundexample dirname=dirname %}
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-->
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<!-- catalog-only-end -->
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## Usage
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Dialogs behave like
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[`<dialog>`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLDialogElement)<!-- {.external} -->
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elements, and can be closed with a `<form method="dialog">` element.
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Dialogs have three optional sections: the headline title, the main content, and
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action buttons.
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```html
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<md-dialog>
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<div slot="headline">
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Dialog title
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</div>
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<form slot="content" id="form-id" method="dialog">
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A simple dialog with free-form content.
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</form>
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<div slot="actions">
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<md-text-button form="form-id">Ok</md-text-button>
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</div>
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</md-dialog>
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```
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<!-- no-catalog-start -->
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<!-- Need to add image -->
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<!-- no-catalog-end -->
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<!-- Need to add catalog-include "figures/<component>/usage.html" -->
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> Tip: use `margin`, `height`, and `width` CSS properties to control the
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> dialog's size and position.
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### Opening and closing
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Dialogs are opened and closed by setting the `open` attribute or property.
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```html
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<md-dialog open>
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<div slot="content">
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A dialog that is opened by default.
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</div>
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</md-dialog>
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```
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Dialogs are also opened and closed by calling `dialog.show()` and
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`dialog.close()`.
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Both return a Promise that resolves after the dialog's animation finishes.
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```ts
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closeButton.addEventListener('click', async () => {
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await dialog.close();
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});
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```
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### Return value
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A button's value attribute will set the dialog's `returnValue` property to
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identify which button closed it.
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```html
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<md-dialog open>
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<form slot="content" id="form-id" method="dialog">...</form>
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<div slot="actions">
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<md-text-button form="form-id" value="cancel">Cancel</md-text-button>
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<md-text-button form="form-id" value="ok">Ok</md-text-button>
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</div>
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</md-dialog>
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```
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```ts
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dialog.addEventListener('close', () => {
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const cancelClicked = dialog.returnValue === 'cancel';
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const okClicked = dialog.returnValue === 'ok';
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});
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```
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## Accessibility
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Dialogs are labelled by their headlines. Add an
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[`aria-label`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-label)<!-- {.external} -->
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attribute to dialogs without a headline.
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```html
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<md-dialog aria-label="Error message">
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<div slot="content">An error occurred, details ...</div>
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</md-dialog>
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```
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### Alerts
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Add a
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[`type="alert"`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/alertdialog_role)
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attribute to dialogs that need to communicate an important message and require a
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user's response.
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Common examples include error messages that require confirmation and other
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action confirmation prompts.
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```html
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<md-dialog type="alert">
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<div slot="headline">Confirm deletion</div>
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<form slot="content" id="form-id" method="dialog">
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Are you sure you wish to delete this item?
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</form>
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<div slot="actions">
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<md-text-button form="form-id" value="cancel">Cancel</md-text-button>
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<md-text-button form="form-id" value="delete">Delete</md-text-button>
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</div>
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</md-dialog>
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```
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## Theming
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Dialogs supports [Material theming](../theming/README.md) and can be customized
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in terms of color, typography, and shape.
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### Tokens
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Token | Default value
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----------------------------------- | ---------------------------------------
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`--md-dialog-container-color` | `--md-sys-color-surface-container-high`
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`--md-dialog-headline-color` | `--md-sys-color-on-surface`
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`--md-dialog-headline-font` | `--md-sys-typescale-headline-small-font`
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`--md-dialog-supporting-text-color` | `--md-sys-color-on-surface-variant`
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`--md-dialog-supporting-text-font` | `--md-sys-typescale-body-medium-font`
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* [All tokens](https://github.com/material-components/material-web/blob/main/tokens/_md-comp-dialog.scss)
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<!-- {.external} -->
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### Example
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<!-- no-catalog-start -->
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<!-- Need to add image -->
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<!-- no-catalog-end -->
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<!-- Need to add catalog-include "figures/<component>/usage.html" -->
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```html
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<style>
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:root {
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/* System tokens */
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--md-sys-color-surface-container-highest: #dde4e3;
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--md-sys-color-on-surface: #161d1d;
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--md-sys-color-on-surface-variant: #3f4948;
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--md-sys-typescale-body-medium: system-ui 16px/24px;
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--md-sys-typescale-headline-small: system-ui 24px/32px;
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/* Component tokens */
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--md-dialog-container-shape: 0px;
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}
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</style>
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<md-dialog>
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<div slot="headline">Title</div>
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<div slot="content">Dialog content</div>
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</md-dialog>
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```
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<!-- auto-generated API docs start -->
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## API
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### MdDialog <code><md-dialog></code>
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#### Properties
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<!-- mdformat off(autogenerated might break rendering in catalog) -->
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| Property | Attribute | Type | Default | Description |
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| --- | --- | --- | --- | --- |
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| `quick` | `quick` | `boolean` | `false` | Skips the opening and closing animations. |
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| `returnValue` | | `string` | `''` | Gets or sets the dialog's return value, usually to indicate which button a user pressed to close it.<br>https://developer.mozilla.org/en-US/docs/Web/API/HTMLDialogElement/returnValue |
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| `type` | `type` | `string` | `undefined` | The type of dialog for accessibility. Set this to `alert` to announce a dialog as an alert dialog. |
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| `noFocusTrap` | `no-focus-trap` | `boolean` | `false` | Disables focus trapping, which by default keeps keyboard Tab navigation within the dialog.<br>When disabled, after focusing the last element of a dialog, pressing Tab again will release focus from the window back to the browser (such as the URL bar).<br>Focus trapping is recommended for accessibility, and should not typically be disabled. Only turn this off if the use case of a dialog is more accessible without focus trapping. |
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| `open` | `open` | `boolean` | `undefined` | |
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| `getOpenAnimation` | | `() => DialogAnimation` | `function { ... }` | Gets the opening animation for a dialog. Set to a new function to customize the animation. |
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| `getCloseAnimation` | | `() => DialogAnimation` | `function { ... }` | Gets the closing animation for a dialog. Set to a new function to customize the animation. |
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<!-- mdformat on(autogenerated might break rendering in catalog) -->
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#### Methods
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<!-- mdformat off(autogenerated might break rendering in catalog) -->
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| Method | Parameters | Returns | Description |
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| --- | --- | --- | --- |
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| `show` | _None_ | `Promise<void>` | Opens the dialog and fires a cancelable `open` event. After a dialog's animation, an `opened` event is fired.<br>Add an `autofocus` attribute to a child of the dialog that should receive focus after opening. |
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| `close` | `returnValue` | `Promise<void>` | Closes the dialog and fires a cancelable `close` event. After a dialog's animation, a `closed` event is fired. |
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<!-- mdformat on(autogenerated might break rendering in catalog) -->
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#### Events
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<!-- mdformat off(autogenerated might break rendering in catalog) -->
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| 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 |
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| --- | --- | --- | --- | --- |
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| `open` | `Event` | No | No | Dispatched when the dialog is opening before any animations. |
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| `opened` | `Event` | No | No | Dispatched when the dialog has opened after any animations. |
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| `close` | `Event` | No | No | Dispatched when the dialog is closing before any animations. |
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| `closed` | `Event` | No | No | Dispatched when the dialog has closed after any animations. |
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| `cancel` | `Event` | No | No | Dispatched when the dialog has been canceled by clicking on the scrim or pressing Escape. |
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<!-- mdformat on(autogenerated might break rendering in catalog) -->
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<!-- auto-generated API docs end -->
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