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Creating App Templates

An app template bootstraps the loading of the framework and the app. Customize an app’s template by creating a component that extends the default aura:template template.

A template must have the isTemplate system attribute in the <aura:component> tag set to true. This informs the framework to allow restricted items, such as <script> tags, which aren't allowed in regular components.

A component with the isTemplate system attribute set to true can’t be used on a site page. To use a component on a site page, the isTemplate system attribute can’t be set to true.

For example, a sample app has a np:template template that extends aura:template. np:template looks like:

Note how the component extends aura:template and sets the title attribute using aura:set.

The app points at the custom template by setting the template system attribute in <aura:application>.

A template can only extend a component or another template. A component or an application can't extend a template.

Lightning Aura Components Developer Guide

Creating App Templates