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HTML 中的 <main>属性

HTML <main>标签指定文档中的主要或重要内容。每页只能使用一次，并且不能用作<article>，<aside>，<footer>，<header>，<nav>元素的子类。

main示例

<!DOCTYPE html>
<html>

   <body>
      <main>
         <h1>Learning</h1>
         <p>Learn to gain experience and try to share your knowledge with others.</p>
         
         <article>
            <h3>Web Development Tutorials</h3>
            <p>Consist of CSS, HTML, and PHP tutorials for 2nd Semester exams.</p>
         </article>
         
         <article>
            <h3>Academic Tutorials</h3>
            <p>Consist of Computer Fundamental, Computer Network tutorials for
               1st Semester exams.</p>
         </article>
      </main>
   </body>

</html>