Suppose we have an <input> element and want to know its type.

<input type="text">

The following example uses the decorator to inject the string literal text in a directive.

@Directive({
  selector: 'input',
})
class InputAttrDirective {
  constructor(@Attribute('type') type: string) {
    // type would be 'text' in this example
  }
}

The following example uses the decorator in a component constructor.

@Component({
  selector: 'page',
  template: 'Title: {{title}}',
})
class Page {
  title: string;
  constructor(@Attribute('title') title: string) {
    this.title = title;
  }
}