應(yīng)使用語義HTML標籤而非通用div以提升可訪問性、SEO和代碼維護性。 ①語義標籤如nav、article幫助屏幕閱讀器識別內(nèi)容結(jié)構(gòu)；②header、footer、main等定義頁面區(qū)域並增強搜索引擎理解；③aside、section用於組織相關(guān)但非核心的內(nèi)容；④figure與figcaption結(jié)合優(yōu)化媒體描述；⑤在無合適語義標籤或僅需佈局時才使用div。

You should use semantic HTML tags instead of generic <div> s whenever you want to clearly describe the meaning or purpose of a section of your webpage, both for browsers and for other developers reading your code. It's not just about style—it helps with accessibility, SEO, and long-term maintainability. <img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175234057356428.jpeg" class="lazy" alt="When should you use semantic html tags instead of generic divs?"><h3 id="Improve-Accessibility-for-Screen-Readers"> Improve Accessibility for Screen Readers</h3> <p> Screen readers rely heavily on semantic markup to navigate and interpret content. A <code><nav></nav> tag tells assistive technology that this is a navigation area, while an <article></article> signals a self-contained piece of content like a blog post.

• Use <header></header> , <footer></footer> , <nav></nav> , <main></main> , and <aside></aside> to define page structure
• Avoid wrapping everything in
  unless there's no better semantic alternative
• Make sure landmarks are used consistently so screen reader users can jump between sections easily

For example, someone using a screen reader might skip through the <nav></nav> to get to the <main></main> content quickly. If you only use <div> s, they lose that ability entirely.<h3 id="Help-Search-Engines-Understand-Your-Content"> Help Search Engines Understand Your Content</h3> <p> Search engines use semantic tags to determine what different parts of your page mean. An <code><h1></h1> inside a <header></header> usually indicates the main title of the page. An <article></article> typically contains a standalone piece of content like a news story or blog post.



Using semantic HTML gives search engines more context than a series of

s ever could. This doesn't guarantee higher rankings, but it makes your site clearer and easier to index.

Some ways this plays out:

• Using <article></article> for blog posts helps crawlers understand what the main content is
• Wrapping side content in <aside></aside> tells search engines it's less central
• <time></time> tags help mark up dates in a machine-readable format

Make Code Easier to Read and Maintain

Semantic tags act as built-in documentation. When another developer looks at your HTML, they can immediately tell what each part does without needing extra comments or class names.

Instead of seeing:

 <div class="navigation">
  ...
</div>

They see:

 <nav>
  ...
</nav>

This clarity pays off especially in larger projects where multiple people work on the same codebase. It also reduces the need for deeply nested class structures just to explain what something is.

Common semantic tags and their uses:

• <section></section> – Thematic grouping of content, usually with a heading
• <article></article> – Independent, reusable content block
• <aside></aside> – Tangentially related content (like a sidebar)
• <figure></figure> <figcaption></figcaption> – For images, diagrams, or media with captions

Know When to Fall Back to <div><p> Sometimes, a <code><div> is exactly what you need—when there's no semantic tag that fits the current role or when you're styling something purely for layout purposes.<p> Examples include:</p> <ul> <li> Wrapping multiple elements together for styling with Flexbox or Grid</li> <li> Applying background colors or spacing where no semantic meaning is needed</li> <li> Creating presentational containers that don't represent meaningful content</li> </ul> <p> In these cases, don't force a semantic tag if none applies. Just be intentional about when and why you choose a <code><div> over something more descriptive.<p>基本上就這些。</p> </div>