popupwithoutcomponent

 <button (click)="openDialog(template)">Open my dialog</button>

<ng-template #template>
 <h1>This is a message</h1>
</ng-template>

Component.ts
import {MatDialog, MatDialogRef} from '@angular/material/dialog';


constructor(dialog: MatDialog) {}

openDialog(templateRef) {
  let dialogRef = this.dialog.open(templateRef, {
   width: '300px'
 });
}