CSS3包含选择器与类选择器

html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>title>
    <style type="text/css">
        .parent {
            border: 1px solid red;
            height: 60px;
            margin: 5px;
        }
        .son {
            border: 1px solid red;
            height: 20px;
        }
        /*注意.之前没有空格*/
        div.abc {
            background-color: green;
        }
        /*注意.之前有空格*/
        div .abc {
            background-color: yellow;
        }
    style>
head>
<body>
    <div class="parent">
        <div class="abc son">div>
        <div class="son">div>
    div>
    <div class="abc parent">div>
body>
html>

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