<!DOCTYPE html><html><head> <title>三级菜单demo</title> <meta charset=&...
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//html: <div class="nav"> <ul class='onebox'> <li name=...
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效果如下： <div class="nav"> <ul class='onebox'> <li name='...
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盒子模型 <!DOCTYPE html> <html lang="en"> <head> ...
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<!DOCTYPE html><style> div:nth-child(1){ width: ...
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<!DOCTYPE html><style> div:nth-child(1){ width: ...
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//html: <body> <!-- nav --> <div class="nav"> <ul> <...
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<html><head> <meta charset="UTF-8"> <style&...
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<!DOCTYPE html><html lang="en"><head> <meta charset=&quo...
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<!DOCTYPE html><html lang="en"><head> <meta charset=&quo...
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<html><form> <input id="email" type="text"...
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有类选择器，id选择器，标签选择器，子类选择器，父类选择器等 <style type="text/css"> &nb...
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<!DOCTYPE html> <html lang="en"> <head> &nbs...
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继续根据17173网站导航条的的下拉菜单进行模仿下拉菜单案例！结合两次作业，个人理解制作导航一定要提前有多规划，不光要规划好各盒子的宽度高度，更要对盒子的层级有清晰的定位！只有提前定位好层级，才能更好...
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<!DOCTYPE html><html lang="en"><head> <meta charset=&quo...
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