A.〈div class=’box’〉〈/div〉 B.〈div class=’boxleft’〉〈/div〉 C.〈div id=’box’〉〈/div〉 D.〈div style=’border:1px solid red’〉〈/div〉
A.submit B.reset C.button D.option
A.a:hover{} B.a:link{} C.p:active{} D.img:visited{}