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css学习 div浮动
两个div在同一行显示
左边div style=float:left
右边div style=float:right
div上面不允许有左/右侧浮动层(被遮住) style=clear:left/right
div上面不允许有左且右浮动层 style=clear:both
mouseover 弹出层
样式表pop_us.css
.arrow-left {
background-image: url("../images/arrow_lr.png");
background-position: 0 -20px !important;
height: 17px;
left: -9px;
overflow: hidden;
posit ...
div+css居中
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtm ...