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Allows for a nested structure - Works with (or without) ng-repeat - Allows multiple sections open at once - Optimized for mobile devices...

https://www.google.com/url?rct=j&sa=t&url=http://codepen.io/LukaszWatroba/pen/pvEOBZ&ct=ga&cd=CAIyGjkxYTc3YmVlM2M5OTBlMDU6Y29tOmVuOlVT&usg=AFQjCNHg8UDkzjjUWw3kQ9Pe7kMgQx9sBw