4.4: Collapse inline display example
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**Primary Actor**: User

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

**Goal**: Show user collapse with inline display example

Main success scenario:
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1. User opens Collapse demo page
2. User clicks on Inline display sub-menu
3. User see clickable "Inline-block" and "None" buttons
4. When user clicks on "Inline-block", then "Some content" appear with style: inline-block
5. When user clicks on "None", tthen "Some content" disappear with style: display-none

Variations:
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2*. User scrolls to Inline display sub-menu