<ins>元素用来显示已经插入到文档的内容，而<del>元素则用来显示已经从文档中删除的文本。
<!DOCTYPE html>
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<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<div>修改</div>
<p>一篇文章里面如果出现了错误就可以用到这个，删除<del>错误的</del>再填写<ins>正确的</ins>
然后后就修改完成了。</p>
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