angularjs @Component({ ... template: '<p #bio></p>' }) export class UserDetailsComponent { @ViewChild('bio') bio; }1.
It provides access from within the component class to the ElementRef object for the `<p>` tag that has the bio template reference variable in the component's template view.
2.
It indicates that the `<p>` tag be rendered as a child of the parent view that uses this component.
3.
It makes the `<p>` tag in the template support content projection.
4.
It makes the `<p>` tag visible in the final render. If the #bio was used in the template and the @ViewChild was not used in the class, then Angular would automatically hide the `<p>` tag that has #bio on it.
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