有时候让padding-bottom=0,但是下边距还是会有,这是为什么?padding-top、padding-left、padding-right均正常

有时候让padding-bottom=0,但是下边距还是会有,这是为什么?padding-top、padding-left、padding-right均正常 margin=0 padding=0是什么意思 .neteaseProduct {CLEAR:both; BORDER-RIGHT:#cbcbcb 1px solid; PADDING-RIGHT:0px; BORDER-TOP:#cbcbcb 1px solid; PADDING-LEFT:0px; BACKGROUND:#f2f6fb; PADDING-BOTTOM:0px; OVERFLOW:hidden; BORDER-LEFT:#cbcbcb 1px solid; PADDING-TOP:3px; BORDER-BOTTOM:#cb margin:0; padding:0; * {margin:0px; padding: .cell-padding .grid-unit { margin-bottom: 2.5em; }一般怎么运用 #footersite{clear:both; display:block; overflow:hidden; text-align:center; margin:0px 10px; padding-bottom:0; z-index:11; border-top:1px #E0E0E0 solid; color:#888}#footersite h5,#footersite h6{display:block; margin:0; padding:0; line-height:normal; f body,ul,li { margin:0; padding:0; }ul ,li { list-style:none; }.cl:after { content:.; display:block; height:0; clear:both; visibility:hidden; }.cl { zoom:1; }.frame { margin-bottom:10px; border:1px solid #e1e1e1; background:#FFF; }.title { padding:0 * { padding:0; margin:0; outline:0; * {margin:0;padding:谁告诉哦 bottom bottom css中background和_background属性的区别css样式表中有如下语句：.imminbox { width:39px; height:29px;padding-right:3px; cursor:pointer; position:absolute ;right:1px; bottom:0px;z-index:20; overflow:visible; background:url(../images/im_mi silicon padding padding pool ul,dl,dd,h1,h2,h3,h4,h5,h6,form,p { padding:0; margin:0;}这句话的意义?难道这些元素的默认不是 padding:0; margin: polyester padding polyester padding 如何翻译啊. DIV+CSS * { margin:0;padding:0;border:1px solid red；}