docs(10_Wiki): W3Schools 위키화 — HTML/CSS/JavaScript(core)

W3Schools 튜토리얼을 P-Reinforce v3.1 포맷으로 위키화(영어 본문, 한/영 섹션 헤더). - Topic_HTML: 59문서 (튜토리얼+예제, 레퍼런스/메타 제외) - Topic_CSS: 190문서 (메인 + Advanced/Flexbox/Grid/RWD 전체) - Topic_JavaScript: 120문서 (코어 언어; Temporal/DOM상세/BOM/WebAPI/AJAX/jQuery/Graphics 등은 후속) 각 폴더 00_INDEX.md(MOC) 포함. 코드 verbatim, 미확인분은 "Not found in source" 표기. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-23 19:21:18 +09:00
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+---
+id: css-flexbox-justify-content
+title: "CSS Flexbox Justify Content"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["justify-content", "flexbox main-axis alignment", "flex justify", "horizontal flex alignment", "space-between flexbox"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.89
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["css", "web", "frontend", "w3schools", "flexbox", "justify-content"]
+raw_sources: ["https://www.w3schools.com/css/css3_flexbox_container_justify.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSS Flexbox Justify Content]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The `justify-content` property aligns flex items along the main-axis (horizontally) within a flex container, offering values from simple edge/center alignment to several space-distribution modes. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Main-axis alignment** — `justify-content` controls how flex items are positioned along the main-axis (horizontally) inside a flex container. [S1]
+- **Default is `flex-start`** — items align at the beginning of the container unless another value is set. [S1]
+- **Two families of values** — positional (`center`, `flex-start`, `flex-end`) and space-distribution (`space-around`, `space-between`, `space-evenly`). [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Apply on the container** — `justify-content` is always declared on the element with `display: flex`, not on the items. [S1]
+- **Space distribution choice** — pick `space-between` (no outer space), `space-around` (half-size outer space), or `space-evenly` (equal space everywhere) depending on the desired edge gaps. [S1]
+
+## 📖 세부 내용 (Details)
+The `justify-content` property aligns the flex items along the main-axis (horizontally) within a flex container. [S1]
+
+**`center`** — aligns the flex items in the center of the container. [S1]
+```css
+.flex-container {
+  display: flex;
+  justify-content: center;
+}
+```
+
+**`flex-start`** — aligns the flex items at the beginning of the container (this is default). [S1]
+```css
+.flex-container {
+  display: flex;
+  justify-content: flex-start;
+}
+```
+
+**`flex-end`** — aligns the flex items at the end of the container. [S1]
+```css
+.flex-container {
+  display: flex;
+  justify-content: flex-end;
+}
+```
+
+**`space-around`** — displays the flex items with space before, between, and after the lines. [S1]
+```css
+.flex-container {
+  display: flex;
+  justify-content: space-around;
+}
+```
+
+**`space-between`** — displays the flex items with space between the lines. [S1]
+```css
+.flex-container {
+  display: flex;
+  justify-content: space-between;
+}
+```
+
+**`space-evenly`** — displays the flex items with equal space around them. [S1]
+```css
+.flex-container {
+  display: flex;
+  justify-content: space-evenly;
+}
+```
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own examples apply each value to a `.flex-container` declared with `display: flex`. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Align flex items on the main-axis (language: CSS):
+```css
+.flex-container {
+  display: flex;
+  justify-content: center; /* or flex-start | flex-end | space-around | space-between | space-evenly */
+}
+```
+
+## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
+- **`space-between`** — no space before the first or after the last item; full gaps only between items. [S1]
+- **`space-around`** — space before, between, and after the lines (outer gaps are half the inner gaps). [S1]
+- **`space-evenly`** — equal space around every item, including the container edges. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+No contradictions found in the source.
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.89
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[CSS Tutorial]]
+- **관련 개념:** [[CSS Flexbox Align Items]], [[CSS Flex Items]], [[CSS Flexbox Responsive]]
+- **참조 맥락:** Referenced whenever positioning flex items horizontally along the main-axis of a flex container.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — CSS Flexbox Justify Content — https://www.w3schools.com/css/css3_flexbox_container_justify.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Flexbox Justify Content" page (Astra wiki-curation, P-Reinforce v3.1 format).