Accordion: Nesting
These are nested accordions.
- A title with aria-expanded="true"has a blue border.
- A title with aria-selected="true"has a red border.
- An open item should have both borders.
- Manipulating one accordion shouldn't affect the other.
- 
            Accordion 1
            Base Accordion - 
                  Accordion 1
                  Nested Accordion
- 
                  Accordion 1
                  Nested Accordion
 
- 
                  Accordion 1
                  
- 
            Accordion 1
            Base Accordion