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import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-toggle-button',
  templateUrl: './toggle-button.component.html',
  styleUrls: ['./toggle-button.component.css']
})
export class ToggleButtonComponent implements OnInit {
  hide = false;

  onDisplayButton(){
   this.hide = !this.hide;
  }

}

<button
  (click)="onDisplayButton()"
  >
  Display Details</button>
<p *ngIf="hide">
  This it the paragraph content
</p>