I want to display Add and Delete button in the panel header. Below code displays button with no fa-icon and no label
<p-panel>
<p-header>
<div>
Registration Form
<button type="button" pButton icon="fa-plus" style="float:right" label="Add">
</button>
</div>
</p-header>
</p-panel>
Changing from pi-close to fa-close worked for me.
Seems that there are new and old font awesome icons. They have to be used like this:
class="pi pi-xxx" or class="fa fa-xxx"
You cannot use icon and label at the same time.Try below
<button type="button" pButton icon="fa-plus" style="float:right"></button>
and importing ButtonModule from primeng/button is a must