<!DOCTYPE html><html><head> <meta charset=utf-8" /> &...
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表格table主要用来罗列数据。table有两个子元素：行<tr>，行内又包含列<td>；2行2列的表格： <table> &n...
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<!DOCTYPE html><html><head><meta charset="UTF-8"><title>三级菜单...
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<!DOCTYPE html><html><head><meta charset="UTF-8"><title>三级菜单...
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总结并做了一个简单的边框效果，代码和效果图已上传设置盒子边框为10个像素宽上右下左分别为：红黄绿蓝,实线 虚线 双线 点鼠标移动上去变为带阴影的绿色圆圈，并将阴影改为内部阴影边框设置方法：给元素加上b...
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<!DOCTYPE html><html> <head> <meta charset="utf-8" /> <title&...
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