projects/ui/accordion/accordion-item-title.directive.ts
import { CngxAccordionItemTitle } from '@cngx/ui/accordion'
Projected-title marker for a CngxAccordionItem. Put it on the element that names the section; the item projects it into the header button via <ng-content select="[cngxAccordionItemTitle]">, so the title becomes the header's accessible name.
<ng-content select="[cngxAccordionItemTitle]">
<cngx-accordion-item> <span cngxAccordionItemTitle>Billing</span> Body… </cngx-accordion-item>
[cngxAccordionItemTitle]
cngxAccordionItemTitle