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<div style="width: 100px;height: 100px;background-color: red;">我是一个块级元素</div>
<p>段落标签</p>
<section></section>
<header></header>
<footer></footer>
<article></article>
<nav></nav>
<address></address>
<span style="width: 100px;height: 100px;background-color: red;">行内元素</span>
<i>斜体效果</i>
<em>斜体效果</em>
<cite>斜体效果</cite>
<b>加粗效果</b>
<strong>加粗效果</strong>
<sub>下标</sub>
<sup>上标</sup>
<strike>删除线</strike>
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<code>
var a = 10;
</code>
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