Web前端学习笔记
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>welcome to my world</title>
</head>
<body>
<h1 align="left">我是一级标题</h1>
<h2 align="left">我是二级标题</h2>
<h3 align="left">我是三级标题</h3>
<h4 align="left">我是四级标题</h4>
<h5 align="left">我是五级标题</h5>
<h6 align="left">我是六级标题</h6>
<p align="center">我是一个<br>段落标签</p>
<hr color="blue" width="2000px" size="200px" align="center">
</body>
</html>