和部分有什麼區別？

1. Semantic Meaning

• <section></section> is semantic — it represents a thematic grouping of content, typically with a heading. For example, a chapter, a tab panel, or a distinct part of an article.

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  ✅ Example:

   <section>
    <h2>Introduction</h2>
    <p>This is the introduction section.</p>
  </section>

• <div> is non-semantic — it's a generic container with no inherent meaning. It's used for styling or scripting purposes.

  ✅ Example:

   <div class="highlight">
    <p>This text is wrapped for styling.</p>
  </div>

2. Accessibility & SEO

• <section></section> improves accessibility and SEO because screen readers and search engines can understand the structure of your page better.
• <div> doesn't contribute to document outline or accessibility unless used with ARIA roles.

  Use <section></section> when the content is a standalone part of the document.
  Use <div> when you just need a wrapper for layout or styling.

  ---

  3. When to Use Which?

  ✅ Use <section></section> when:

  • The content could appear in an outline of the page.
  • It makes sense to label it in the document structure.
  • It has a heading ( <h1></h1> – <h6></h6> ).
  • It's a self-contained part of the content (eg, "News", "Features", "Testimonials").

  ✅ Use <div> when:

  • You need a container purely for CSS layout or JavaScript hooks.
  • There's no semantic relationship between the child elements.
  • You're not defining a meaningful section in the document flow.

  ---

  4. Key Takeaway

  Feature	<section></section>	<div>
  Semantic?	Yes	No
  Affects outline?	Yes (if it has a heading)	No
  Styling/layout	Yes (but not its purpose)	Yes (main purpose)
  Accessibility	Helps screen readers	Neutral unless enhanced

  ---

  So, prefer <section></section> over <div> when you're grouping content that forms a logical section of your page . Otherwise, <div> is fine for visual or functional grouping.

  Basically:
? <section></section> = structure and meaning
? <div> = style and convenience

  Hope that clears it up!