Exemple de ngclass :

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<p [ngClass]="'first second'">...</p>

<p [ngClass]="['first', 'second']">...</p>
  
<p [ngClass]="{'first': true, 'second': false}">...</p>
  
<p [ngClass]="stringExp|arrayExp|objExp">...</p>
  
<p [ngClass]="{'class1 class2 class3' : true}">...</p>