<!DOCTYPE html>

<html>

<head>

<title>Sở thích</title>

<style>

body { color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">: 16px; }

h2 {

color: green;

text-align: center;

color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">: 1.5em; /* 24px */

}

ol {

list-style-type: upper-roman;

}

</style>

</head>

<body>

<h2>Danh sách sở thích</h2>

<ol>

</ol>

</body>

</html>

Thẻ <form> trong HTML có tác dụng gì?