基础篇：HTML核心语法
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>HTML基础教程</title>
</head>
<body>
<h1>这是标题1</h1>
<p>这是一个段落，包含<strong>加粗文本</strong>和<em>斜体文本</em></p>
<ul>
<li>无序列表项1</li>
<li>无序列表项2</li>
</ul>
<ol>
<li>有序列表项1</li>
<li>有序列表项2</li>
</ol>
<img src="image.jpg" alt="示例图片" width="200">
<audio controls>
<source src="audio.mp3" type="audio/mpeg">
</audio>
<form>
<label for="name">姓名：</label>
<input type="text" id="name" name="name" required>
<label for="email">邮箱：</label>
<input type="email" id="email" name="email">
<button type="submit">提交</button>
</form>