Ludo
15a6db9c0e
- vault → notes (PKM-exported content) - posts → articles (short-form, no TOC) - papers → essays (long-form, with TOC) - type: post → type: article (posts are just short articles) - layouts/paper → layouts/essay - 08a-paper.css → 08a-essay.css - CSS: fix redundant li resets, remove role="main" from article, replace <small> prev/next labels, add console layout - Update hugo.toml menus, internal URLs, front matter throughout - Add docs/context.md, docs/css-refactor-plan.md
64 lines
3.2 KiB
Markdown
64 lines
3.2 KiB
Markdown
---
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title: "HTML Landmark Elements"
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description: "The full set of semantic HTML landmarks, their ARIA roles, and when context changes their meaning."
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date: 2026-04-11
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type: article
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tags: [semantic-html, html, reference]
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ai-disclosure: generated
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ai-model: claude-sonnet-4-6
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ai-provider: Anthropic
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---
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The full set: `<header>`, `<nav>`, `<main>`, `<article>`, `<section>`, `<aside>`, `<footer>`, plus the newer `<search>`.
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Each maps to an implicit ARIA landmark role, which is what makes them meaningful to screen readers and search engines — not just visual styling hooks.
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## `<header>`
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Introductory content for its nearest sectioning ancestor. At the top level of `<body>` it maps to the `banner` landmark — the site identity zone. Inside an `<article>` or `<section>` it's just a local header with no landmark role.
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## `<nav>`
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A block of navigation links. Maps to the `navigation` landmark. A page can have multiple — give each a distinct `aria-label` (`aria-label="Primary"`, `aria-label="Breadcrumb"`) so screen reader users can tell them apart.
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## `<main>`
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**One per page.** The dominant content — excludes site chrome (nav, sidebar, footer). Maps to the `main` landmark. Skip-to-content links target this. Never nest `<main>` inside another landmark.
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## `<article>`
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Self-contained, independently distributable content. A blog post, a comment, a card, a widget — anything that would make sense pulled out of context and published elsewhere. Maps to the `article` role. Can nest: comments inside a post are valid nested `<article>` elements.
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## `<section>`
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A thematic grouping within a document. Only gets a landmark role (`region`) when given an accessible name via `aria-labelledby` or `aria-label`. Without a name it's an anonymous grouping — semantically inert, like a smarter `<div>`.
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## `<aside>`
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Content tangentially related to the surrounding content. Sidebar, pull quote, callout, related links. Maps to the `complementary` landmark. The relationship is *adjacent*, not *nested* — an `<aside>` inside an `<article>` is tangential to that article, not the whole page.
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## `<footer>`
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Closing content for its nearest sectioning ancestor. At the body level it maps to the `contentinfo` landmark — copyright, legal, site-wide links. Inside an `<article>` it's a local footer (author, date, tags) with no landmark role.
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## `<search>`
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Added in the WHATWG HTML living standard in 2023. Maps to the `search` landmark. Previously you had to write `<form role="search">`. Use it to wrap any search form or filtering UI.
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## The landmark map
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```
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body
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├── <header> → banner
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├── <nav> → navigation
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├── <main> → main
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│ ├── <article> → article
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│ │ ├── <header> → (no landmark — local)
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│ │ ├── <section> → region (only if named)
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│ │ └── <footer> → (no landmark — local)
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│ └── <aside> → complementary
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├── <search> → search
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└── <footer> → contentinfo
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```
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The contextual rule is consistent: `<header>` and `<footer>` carry landmark roles only when they are direct children of `<body>`. Inside `<article>` or `<section>` they lose the landmark and become purely structural.
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