刚写CSS那会,发现同样的代码在别外可以运行,而在自己的网页上不能运行,有时候气得想摔鼠标,其实有时候不是你代码有问题,而是与CSS相关的定义出 了问题,为了避免出现这些错误,即使你是CSS老手,也要关注一下这些常见的错误,下面来说下,在写CSS的时候,究竟有哪些错误是最容易犯的。
一、检查HTML元素是否有拼写错误、是否忘记结束标记
即使是老手也经常会弄错div的嵌套关系。可以用dreamweaver的验证功能检查一下有无错误。
二、确定错误发生的位置
如果错误影响了整体布局,则可以逐个删除div块,直到删除某个div块后显示恢复正常,即可确定错误发生的位置。当然,在测试前请注意原来代码的备份。
三、利用border属性确定出错元素的布局特性
使用float属性布局一不小心就会出错。这时为元素添加border属性确定元素边界,错误原因即水落石出。
例:
border:1px red solid;
四、float元素的父元素不能指定clear属性
MacIE下如果对float的元素的父元素使用clear属性,周围的float元素布局就会混乱。这是MacIE的著名的bug,倘若不知道就会走弯路。
五、检查CSS是否正确
检查一下有无拼写错误、是否忘记结尾的 } 等。可以利用CleanCSS来检查 CSS的拼写错误。CleanCSS本是为CSS减肥的工具,但也能检查出拼写错误。
六、float元素务必指定width属性
很多浏览器在显示未指定width的float元素时会有bug。所以不管float元素的内容如何,一定要为其指定width属性。
七、float元素的宽度之和要小于100%
如果float元素的宽度之和正好是100%,某些古老的浏览器将不能正常显示。请保证宽度之和小于99%。
八、是否重设了默认的样式?
某些属性如margin、padding等,不同浏览器会有不同的解释。因此最好在开发前首先将全体的margin、padding设置为0、列表样式设置为none等
九、float元素需谨慎指定margin和padding等属性
IE在显示指定了margin和padding的float元素时有bug。因此谨慎对float元素指定margin和padding属性。也可以使用hack方法为IE指定特别的值。

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