写一个案例, 演示css中的选择器优先级(忽略js)
实例
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <style> h1 { background-color: yellowgreen; } .id{ background-color: aquamarine; } #id{ background-color: blueviolet; } </style> <h1 id="" class="" title="" style="">标签颜色选择器</h1> <h1 id="" class="id" title="" style="">class颜色选择器</h1> <h1 id="id" class="id" title="" style="">id颜色选择器</h1> <h1 id="id" class="id" title="" style="background-color: brown">style颜色选择器</h1> </body> </html>
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写一个盒模型的简单案例,体会padding/border的简写规则
实例
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>盒模型</title> </head> <body> <style> .h1{ width: 500px; height: 300px; } .h2{ width: 500px; height: 300px; } .a1{ width: 200px; height: 200px; background-color: blueviolet; padding-top: 20px; padding-right: 4px; padding-bottom: 10px; padding-left: 10px; margin-top: auto; margin-right: 5px; margin-bottom: 5px; margin-left: auto; } .a2{ width: 200px; height: 200px; background-color: green; padding:20px 4px 10px 10px; margin: auto 5px; } .b1{ width: 200px; height: 200px; border-top-width: 10px; border-top-style: solid; border-top-color: pink; border-right-width: 10px; border-right-style: solid; border-right-color: pink; border-bottom-width: 10px; border-bottom-style: solid; border-bottom-color: pink; border-left-width: 10px; border-left-style: solid; border-left-color: pink; margin-top: auto; margin-right: 5px; margin-bottom: 5px; margin-left: auto; } .b2{ width: 200px; height: 200px; border:10px solid pink; margin: auto 5px; } </style> <div class="h1"> <div class="a1" style="float:left"> <img src="http://www.php.cn/static/images/user_avatar.jpg"> <p>内边距8行代码</p> </div> <div class="a2" style="float:left"> <img src="http://www.php.cn/static/images/user_avatar.jpg"> <p>内边距2行代码</p> </div> </div> <div class="h2" > <div class="b1" style="float:left"> <img src="http://www.php.cn/static/images/user_avatar.jpg"> <p>边框16行代码</p> </div> <div class="b2" style="float:left"> <img src="http://www.php.cn/static/images/user_avatar.jpg"> <p>边框2行代码</p> </div> </div> </body> </html>
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