<link href="main.css" rel="stylesheet" />
<!--https://developer.mozilla.org/zh-CN/docs/Web/HTML/Reference/Elements/link-->

<script src="javascript.js"></script>

<script>
  alert("Hello World!");
</script>
<!--https://developer.mozilla.org/zh-CN/docs/Web/HTML/Reference/Elements/script-->

<style>
  p {
    color: #26b72b;
  }
  code {
    font-weight: bold;
  }
</style>
<!--https://developer.mozilla.org/zh-CN/docs/Web/HTML/Reference/Elements/style
注释 -->