docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합
이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영. - Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들 (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거. - Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/ Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/ Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이 존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동. - 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리. - Topic_Programming 최종 문서 수: 2784 → 3985.
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Antigravity Agent
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---
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id: css-nested-counters
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title: "CSS Nested Counters"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["CSS nested counters", "counters() function", "multi-level numbering", "section subsection numbering", "nested list numbering"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["css", "web", "frontend", "w3schools", "counters", "generated-content", "lists"]
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raw_sources: ["https://www.w3schools.com/css/css_counters_nested.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Nested Counters]]
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## 🎯 한 줄 통찰 (One-line insight)
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By running two counters at once — or by using the `counters()` function — CSS can produce multi-level numbering such as "Section 1.1" or outline-style "1.1.1" labels for nested lists, all without JavaScript. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Two counters** — you can maintain more than one counter to number different levels (e.g., a `section` counter for the page and a `subsection` counter reset on each `<h1>`). [S1]
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- **`counters()` function** — returns the current values of the named and nested counters, as a string. [S1]
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- **`counters()` vs `counter()`** — `counter()` returns the current value of a single named counter; `counters()` returns the named and nested counter values combined into a string. [S1]
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- **Separator argument** — `counters(name, separator)` inserts a string (e.g., `"."`) between nesting levels. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Per-level reset** — reset the lower-level counter on the higher-level element (reset `subsection` on each `<h1>`) so it restarts under every parent. [S1]
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- **Self-nesting lists** — reset the same counter on every `<ol>` and emit `counters(section,".")` on each `<li>::before` to auto-build hierarchical numbers like 1, 1.1, 1.2. [S1]
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## 📖 세부 내용 (Details)
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**CSS Using Two Counters**
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You can create multiple counters for different numbering levels: a `section` counter for the page and a `subsection` counter for each `<h1>` element. The `section` counter increments on each `<h1>`, while a `subsection` counter (reset on each `<h1>`) increments on each `<h2>`, producing labels like "Section 1." and "1.1". [S1]
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```css
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body {
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counter-reset: section;
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}
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h1 {
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counter-reset: subsection;
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}
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h1::before {
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counter-increment: section;
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content: "Section " counter(section) ". ";
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}
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h2::before {
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counter-increment: subsection;
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content: counter(section) "." counter(subsection) " ";
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}
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```
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**The CSS counters() Function**
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The `counters()` function returns the current values of the named and nested counters, as a string. In this example, the same `section` counter is reset on every `<ol>` and incremented on each `<li>`, and `counters(section,".")` joins the nested values with a `"."` separator to produce outline numbering within an ordered-list structure: [S1]
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```css
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ol {
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counter-reset: section;
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list-style-type: none;
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}
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li::before {
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counter-increment: section;
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content: counters(section,".") " ";
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}
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```
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**CSS Counter Properties**
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The page lists the following counter-related properties and functions: [S1]
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| Property / Function | Description |
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| --- | --- |
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| `content` | Used with the `::before` and `::after` pseudo-elements, to insert generated content [S1] |
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| `counter-increment` | Increments one or more counter values [S1] |
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| `counter-reset` | Creates or resets one or more counters [S1] |
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| `counter()` | Returns the current value of the named counter [S1] |
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| `counters()` | Returns the current values of the named and nested counters [S1] |
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## 🛠️ 적용 사례 (Applied in summary)
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The page's examples are the applied cases: "Section N." / "N.M" headings produced by two counters, and outline-style "1.1.1" numbering for a nested ordered list via `counters()`. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Two-level heading numbering (language: CSS):
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```css
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h1::before {
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counter-increment: section;
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content: "Section " counter(section) ". ";
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}
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h2::before {
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counter-increment: subsection;
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content: counter(section) "." counter(subsection) " ";
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}
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```
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Self-nesting list numbering (language: CSS):
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```css
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li::before {
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counter-increment: section;
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content: counters(section,".") " ";
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **`counter()`** — use when you need the value of a single counter at one level (e.g., "Section 3"). [S1]
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- **`counters()`** — use when you need the named and nested counter values joined into one string for multi-level/outline numbering (e.g., "3.2.1"), supplying a separator argument such as `"."`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source.
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.88
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[CSS Tutorial]]
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- **관련 개념:** [[CSS Counters]], [[CSS Lists]], [[CSS Pseudo-elements]]
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- **참조 맥락:** Referenced when building multi-level outline numbering for headings or nested lists.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Nested Counters — https://www.w3schools.com/css/css_counters_nested.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Nested Counters" page (Astra wiki-curation, P-Reinforce v3.1 format).
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