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Home > Web Front-end > HTML Tutorial > .使用 HTML+CSS 实现如图布局，border-widht 5px，一个格子大小是 50*50，hover时候边框变为红色（兼容IE6+，考虑语义化的结构）_html/css_WEB-ITnose

.使用 HTML+CSS 实现如图布局，border-widht 5px，一个格子大小是 50*50，hover时候边框变为红色（兼容IE6+，考虑语义化的结构）_html/css_WEB-ITnose

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Release： 2016-06-24 11:35:03
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css淘宝测试练习题


一.使用 HTML+CSS 实现如图布局，border-widht 5px，一个格子大小是 50*50，hover时候边框变为红色（兼容IE6+，考虑语义化的结构）


.使用 HTML+CSS 实现如图布局，border-widht 5px，一个格子大小是 50*50，hover时候边框变为红色（兼容IE6+，考虑语义化的结构）_html/css_WEB-ITnose

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1. 对于同级元素，默认(或position:static)情况下文档流后面的元素会覆盖前面的。

2. 对于同级元素，position不为static且z-index存在的情况下z-index大的元素会覆盖z-index小的元素，即z-index越大优先级越高。

3. IE6/7下position不为static，且z-index不存在时z-index为0，除此之外的浏览器z-index为auto。

4. z-index为auto的元素不参与层级关系的比较，由向上遍历至此且z-index不为auto的元素来参与比较。

 

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.使用 HTML+CSS 实现如图布局，border-widht 5px，一个格子大小是 50*50，hover时候边框
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