html css有感_html/css_WEB-ITnose
placeholder:是输入框内部的提示语。css3可用
div布局问题
display:inline-block;可以实现div横向排列和设置div的大小（一般单纯设置inline是无法设置其大小的）。
float:right可以使div靠右显示。
text-align:center;文字水平居中显示。
line-height:行高;实现文字的垂直居中显示。
通过调节 margin或者padding实际高度实现居中。
通过使用position:relative 然后设置left或者right等位置信息实现居中显示。
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