A.// B./**/ C.:: D.;
A..div1{color:#00f} B.#div1{color:#00f} C.di{color:#00f}div{color:#00f} D..div1{color:#f00}
A.h1{font-size:14px;} B.hr{color:red;} C.div{margin:0padding:0} D.*{margin:0;padding:0}