This example has no active section. When
closeAble is automatically set to
activeIndex may be an array of integers. For example if you pass
[2, 4], section 2 and 4 will be open by default.
When the accordion contains only one section it will be open by default and
closeAble set to
To make it closed by default, set
false, so when a section is opened other section are not closed. This automatically set