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?: class를 이용한 nav 구성
기존 dom 구조에 보여주고 싶은 content를 하위에 둠
이를 display: none 옵션을 주어 보이지는 않지만, 내부 크기를 볼
수 있도록 설정
각 tab별로 이동 시 background dom 구조를 이동시켜 보이게 함
위치 계산 시에는 getBoundingClientRect() 를 이용해 좌표, 크기를
가져옴