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                <div style="display:flex">
   <div>테스트 테스트 테스트</div>
   <div style="float:left">이 박스는 float:left지만 flex는 무시하지</div>
   이 박스는 요소로 감싸지지 않았지만 익명 박스가 생성되지.
   <span>이 박스는 인라인 요소지만 플렉스 아이템이 되지</span>


                div > * {
   border:1px solid #ddd;