元素在HTML中用於定義網頁的主要內容，該內容應是文檔獨有的，不應出現在側邊欄、導航欄或頁腳中。它幫助開發(fā)者和輔助技術如屏幕閱讀器識別頁面核心內容，提升可訪問性。例如，屏幕閱讀器用戶可通過快捷鍵直接跳轉至部分，瀏覽器也可利用它快速定位相關內容。此外，改善代碼可讀性和維護性，使主要內容與其他佈局部分清晰分離。雖然搜索引擎不會僅因使用而提高頁面排名，但其有助於語義結構清晰，利於爬蟲理解頁面內容。通常包含最重要的SEO文本和媒體，且應避免嵌套在、
The <main></main> element in HTML is used to define the main content of a webpage. This content should be unique to the document and not appear in sidebars, navigation bars, or footers. It helps both developers and assistive technologies like screen readers identify the core content of a page.
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Improves Accessibility
One of the biggest benefits of using <main></main> is how it supports accessibility. Screen readers can jump directly to the main content, skipping over repetitive elements like navigation menus. This makes browsing more efficient for users who rely on assistive tools.
For example:
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- A screen reader user might activate a shortcut key to go straight to the
<main></main> section.
- Browsers with built-in navigation features (like Safari's "Start Typing to Search" function) can use
<main></main> to locate relevant content quickly.
This tag doesn't just help machines — it also makes your code easier to read and maintain by clearly separating the primary content from other parts of the layout.
SEO and Semantic Clarity
While search engines don't necessarily rank pages higher just for using <main></main> , it contributes to better semantic structure. Clean, meaningful markup helps crawlers understand what your page is about.
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Consider this:
- The
<main></main> section often contains the most important text and media for SEO.
- Proper use of semantic tags (like
<main></main> , <header></header> , <footer></footer> , etc.) creates a clearer outline of your page, which may improve how your content is indexed.
It's worth noting that there should only be one <main></main> element per page, and it shouldn't be nested inside elements like <article></article> , <aside></aside> , <footer></footer> , <header></header> , or <nav></nav> .
Practical Usage and Styling
You can treat <main></main> like any other block-level element. It's commonly used as a container for the central part of a layout, making it a good candidate for styling with CSS.
Here are some typical uses:
- Wrapping the central article or product description
- Applying styles such as padding, margin, or background color specifically to the main area
- Using it alongside layout techniques like Flexbox or Grid
A basic HTML structure might look like this:
<body>
<header>...</header>
<main>
<!-- Main content here -->
</main>
<footer>...</footer>
</body> Since it's supported in all modern browsers, you can safely use <main></main> without worrying about compatibility issues.
基本上就這些。
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