自閉合標籤是HTML中不需要閉合標籤的元素，因為它們不包含內容。常見例子包括：①<img src="/static/imghw/default1.png" data-src="photo.jpg" class="lazy" alt="HTML中的自我關閉標籤是什麼？" >插入圖片；②<br>添加換行；③

<hr>創(chuàng)建水平線；④<input>定義表單輸入；⑤<link>鏈接外部資源；⑥<meta>提供元數(shù)據。這些標籤通過屬性工作，如<img src="/static/imghw/default1.png" data-src="photo.jpg" class="lazy" alt="HTML中的自我關閉標籤是什麼？" >或。正確寫法有兩種：標準HTML語法如，或XHTML風格如，但HTML5推薦前者。注意不能在需要包裹內容的標籤上使用自閉合形式，如錯誤的<div></div>應改為正確閉合的<div>Hello</div>。正確使用自閉合標籤有助於保持代碼簡潔高效，並提升與其他工具如框架的兼容性。

Self-closing tags in HTML are elements that don't require a closing tag because they don't contain any content. They're typically used to insert standalone components like images, line breaks, or input fields.

<hr>

Common Examples of Self-Closing Tags

You've probably seen these tags without even thinking about them. Some of the most commonly used self-closing tags include:

• <img src="/static/imghw/default1.png" data-src="photo.jpg" class="lazy" alt="HTML中的自我關閉標籤是什麼？" > for inserting images
• <br> for line breaks
• <hr> for horizo??ntal rules
• <input> for form inputs
• <link> for linking external resources
• <meta> for metadata

These tags usually only have an opening tag and rely on attributes to function properly. For example:

 <img src="/static/imghw/default1.png"  data-src="photo.jpg"  class="lazy" alt="My photo">
<input type="text" name="username">

They don't wrap around content, so there's no need to close them with a separate tag.

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How to Write Them Correctly

In HTML, you can write self-closing tags two ways:

1. Standard HTML syntax (most common):

    <img  src="/static/imghw/default1.png"  data-src="image.jpg"  class="lazy" alt="HTML中的自我關閉標籤是什麼？" >

2. XHTML-style with a slash (mostly used in XML or JSX):

    <img  src="/static/imghw/default1.png"  data-src="image.jpg"  class="lazy" / alt="HTML中的自我關閉標籤是什麼？" >

   While both work in modern browsers, sticking with the first style is cleaner and more widely accepted in standard HTML5 documents.

   Also, make sure not to use self-closing tags where they don't belong. For example, this would be incorrect:

   ? <div></div><br> ? <div>Hello</div>

   Because

   is meant to wrap content, it should always have a closing tag.<hr>

   Why They Matter in Web Development

   Using self-closing tags correctly helps keep your HTML clean and efficient. They also play well with other tools like frameworks (eg, React) or templating systems, where proper structure matters for rendering.

   It's easy to overlook small syntax details, but knowing which tags are self-closing and how to format them avoids unnecessary bugs — especially when working across different environments.

   So next time you're writing HTML, just remember: if the tag doesn't wrap content, it likely doesn't need a closing tag either.

   基本上就這些。

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