1.HTML文档中包含各种级别的标题,各种级别的标题由<h1>到<h6>元素来定义,<h1>至<h6>标题标记中的字母h是英文headline的简称。其中<h1>代表1级标题,级别最高,文字也最大,其他标题元素依次递减,<h6>级别最小。

  2.案例代码

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>文本标题</title>
</head>
<body>
<h1>这是1级标题</h1>
<h2>这是2级标题</h2>
<h3>这是3级标题</h3>
<h4>这是4级标题</h4>
<h5>这是5级标题</h5>
<h6>这是6级标题</h6>
</body>
</html>

  3.案例截图

aaarticlea/png;base64,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" alt="" />

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