13.12: Tabs Accessibility example
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**Primary Actor**: User

**Scope**: Ngx-bootstrap DEMO / BS version 3&4

**Goal**: Show user info about accessibility

Main success scenario:
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1. User opens Tabs demo page
2. User clicks on Accessibility sub-menu
3. User see info about role="tablist", role="tab" and role="tabpanel" attributes
4. User see info about aria-controls, aria-selected and aria-labelledby attributes