1. 使用<!-- --> 語法添加HTML註釋，內容不會在瀏覽器中顯示；2. 註釋可用於代碼說明、團隊協(xié)作和調試；3. 可臨時註釋代碼塊以禁用頁面部分；4. 註釋對查看源碼者可見，不可存放敏感信息；5. 不支持嵌套註釋。 HTML註釋是管理代碼的有效工具，且不影響用戶界面顯示。

To add comments in your HTML code that are not visible to users in the browser, you use HTML comment syntax. These comments are ignored by browsers when rendering the page but are useful for developers to leave notes, explanations, or reminders in the code.

How to Write HTML Comments

Use the following syntax to create a comment in HTML:

 <!-- This is a comment -->

Anything between <!-- and --> will be treated as a comment and will not be displayed on the webpage.

Examples:

 <!-- This is a single-line comment -->
<p>This is a visible paragraph.</p>

<!-- 
  This is a 
  multi-line comment 
-->
<div>This div will show up in the browser.</div>

Why Use HTML Comments?

• Code Documentation : Explain the purpose of a section (eg, navigation bar, footer).
• Team Collaboration : Help other developers understand your code.
• Debugging : Temporarily "comment out" code instead of deleting it during testing.

Example in Practice:

 <!-- Header Section -->
<header>
  <h1>Welcome to My Website</h1>
  <nav>
    <!-- Main navigation links -->
    <ul>
      <li><a href="/">Home</a></li>
      <li><a href="/about">About</a></li>
    </ul>
  </nav>
</header>

<!-- Footer Section (currently under construction) -->
<!--
<footer>
  <p>&copy; 2024 My Site</p>
</footer>
-->

In the example above, the footer is commented out, so it won't appear in the browser. This is useful when you want to disable part of the page temporarily.

Things to Keep in Mind

• Comments can be seen by anyone viewing the page source (right-click → "View Page Source").
• Avoid putting sensitive information (like passwords or API keys) in HTML comments — they're not secure.
• You cannot nest comments (ie, put a <!-- --> inside another comment).

Basically, HTML comments are a simple but powerful tool for organizing and managing your code without affecting what users see.

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