Web Accessibility Academy · 课时

header、nav、main、footer：四大区域

使用用户所期待的区域包裹页面

header、nav、main、footer：四大区域 是 CoddyKit 上的免费 Web Accessibility Academy 课时。这是第 1 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Web Accessibility Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Web Accessibility Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

A Map for Your Page

Sighted users scan a page in a glance. Screen reader users need a map, and HTML5 landmark elements draw it for them.

Meet the Big Four

Four elements cover most pages: header, nav, main, and footer. Together they split your layout into regions users can jump between. 🗺️

header: The Top Banner

A page-level header holds your site name, logo, and intro content. Screen readers expose it as the banner region.

<header>
  <h1>CoddyKit</h1>
</header>

nav: Where Links Live

Wrap your primary set of links in nav. It tells assistive tech this block is navigation, so users can find or skip it fast.

<nav>
  <a href="/">Home</a>
  <a href="/docs">Docs</a>
</nav>

main: The Real Content

The main element wraps the unique content of the page. It is the destination users care about most.

<main>
  <h1>Article title</h1>
  <p>Body...</p>
</main>

footer: The Bottom Region

A page-level footer holds copyright, legal links, and contact info. Screen readers announce it as the contentinfo region.

<footer>
  <p>&copy; 2026 CoddyKit</p>
</footer>

Implicit Roles for Free

These tags carry built-in ARIA roles, so header becomes banner and nav becomes navigation with zero extra attributes.

Context Changes the Role

A header inside an article is just a section header, not the page banner. Only a top-level header counts as the banner landmark.

Why div Cannot Do This

A div has no role, so a screen reader sees nothing to jump to. Landmark tags turn invisible structure into real navigation.

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

A Whole Page Mapped

Stack the four together and a screen reader user instantly hears the shape of your page before reading a word. 🎯

<header>...</header>
<nav>...</nav>
<main>...</main>
<footer>...</footer>

Free Skip-Ahead Power

With landmarks in place, users can jump past the header straight to main, skipping repeated links on every page.

Quick Check

Which landmark wraps the unique, primary content of a page?

Recap: The Big Four

You learned that header, nav, main, and footer give screen reader users a map. Native tags mean free landmark roles. 🙌

常见问题解答

「header、nav、main、footer：四大区域」课时是免费的吗？

是的 — 「header、nav、main、footer：四大区域」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Web Accessibility Academy 课程的其余内容，请升级到 CoddyKit PRO。 Web Accessibility Academy 课程共包含 4 节课。

「header、nav、main、footer：四大区域」这节课中我会学到什么？

使用用户所期待的区域包裹页面你通过在浏览器中直接运行的动手代码来练习 Web Accessibility Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Web Accessibility Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Web Accessibility Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 1 节课，共 4 节。

「header、nav、main、footer：四大区域」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Web Accessibility Academy 课中编写并运行代码吗？

能。每节 Web Accessibility Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

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