1.3: Alerts Additional content example
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**Primary Actor**: User

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

**Goal**: Show user alert example with long content

Main success scenario:
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1. User open Alerts demo page
2. User click on Additional content sub-menu
3. User see 1 alert with type: success
4. Content inside should contain header h4 and 2 paragraphs

Variations:
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2*. User scroll to Additional content sub-menu