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aura:application

An app is a special top-level component whose markup is in a .app resource.

The markup looks similar to HTML and can contain components as well as a set of supported HTML tags. The .app resource is a standalone entry point for the app and enables you to define the overall application layout, style sheets, and global JavaScript includes. It starts with the top-level <aura:application> tag, which contains optional system attributes. These system attributes tell the framework how to configure the app.

System Attribute	Type	Description
`access`	String	Indicates whether the app can be extended by another app outside of a namespace. Possible values are `public` (default), and `global`.
`controller`	String	The Apex controller class for the app. The format is `namespace.myController`.
`description`	String	A brief description of the app.
`extends`	Component	The app to be extended, if applicable. For example, `extends="namespace:yourApp"`.
`extensible`	Boolean	Indicates whether the app is extensible by another app. Defaults to `false`.
`implements`	String	A comma-separated list of interfaces that the app implements.
`template`	Component	The name of the template used to bootstrap the loading of the framework and the app. The default value is `aura:template`. You can customize the template by creating your own component that extends the default template. For example: `<aura:component extends="aura:template" ... >`
`tokens`	String	A comma-separated list of tokens bundles for the application. For example, `tokens="ns:myAppTokens"`. Tokens make it easy to ensure that your design is consistent, and even easier to update it as your design evolves. Define the token values once and reuse them throughout your application.
`useAppcache`	Boolean	Deprecated. Browser vendors have deprecated AppCache, so we followed their lead. Remove the `useAppcache` attribute in the `<aura:application>` tag of your standalone apps (.app resources) to avoid cross-browser support issues due to deprecation by browser vendors. If you don’t currently set `useAppcache` in an `<aura:application>` tag, you don’t have to do anything because the default value of `useAppcache` is `false`.

aura:application also includes a body attribute defined in a <aura:attribute> tag. Attributes usually control the output or behavior of a component, but not the configuration information in system attributes.

Attribute	Type	Description
`body`	`Component[]`	The body of the app. In markup, this is everything in the body of the tag.

Lightning Aura Components Developer Guide

aura:application

See Also