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@@ -0,0 +1,27 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ /* div{
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+ color: red;
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+ } */
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+ /* 以"."开头的选择器称为类选择器 */
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+ /* .div1{
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+ color: red;
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+ } */
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+ /* 以#开头的选择器为ID选择器 且是唯一的 */
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+ #divid{
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+ color: red;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div class="div1" id="divid">hello</div>
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+ <div>world</div>
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+ <div class="div1">你好</div>
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+ <div style="color:blue">世界</div>
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+</body>
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+</html>
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