css学习笔记一_html/css_WEB-ITnose
1、在css开头用* {margin:0;padding:0;}可以清除所有样式
2、在css中table,th,td {padding:0;}效果等同于cellpadding="0″.
3、在css中table {border-spacing: 0;}效果等同于cellspacing="0".
但是在IE6中不支持,故使用类似的table{border-collapse: collapse;}。注意:只是类似。
4、在用table拼接切片图片的时候,以下css可以解决图片间隙问题
table{width: 990px;height: 100%;line-height: 0;border-collapse: collapse;/*等同于cellspacing="0"*/padding:0;border:0;}th,td { padding: 0; }
5、若是用div拼接图片,可以使用div {vertical-align:top;outline-width:0;}解决上下间隙问题
6、子元素使用margin-top时,父元素背景图片下沉,可以使用以下方法解决。
(1)、给父元素的添加padding-top: 1px;
(2)、给子元素添加float属性
(3)、父元素添加position:relative;子元素添加position:absolute;
(4)、父元素添加border-top: 1px solid #fff;

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