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3.9 KiB
id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit
| id | title | category | status | verification_status | canonical_id | aliases | duplicate_of | source_trust_level | confidence_score | created_at | updated_at | review_reason | merge_history | tags | raw_sources | applied_in | github_commit | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| w3css-flexbox | W3CSS Flexbox | Programming_Language | draft | conceptual |
|
B | 0.88 | 2026-07-04 | 2026-07-04 |
|
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W3CSS Flexbox
🎯 한 줄 통찰 (One-line insight)
"Perfect centering" — a notoriously fiddly CSS problem historically — collapses to exactly TWO properties in flexbox: justify-content:center (horizontal) plus align-items:center (vertical) on the SAME container, which the source explicitly calls out as "the solution" to a common style problem, contrasting flexbox's simplicity against older centering hacks. [S1]
🧠 핵심 개념 (Core concepts)
w3-flex(W3.CSS 5.0+) — one-dimensional flex container (row OR column, unlike grid's row AND column). [S1]flex-direction—row(default, left-to-right),column,row-reverse,column-reverse. [S1]flex-wrap—nowrap(default),wrap,wrap-reverse. [S1]justify-content— aligns items along the main axis:center,flex-start,flex-end,space-around,space-between,space-evenly. [S1]align-items— aligns items along the cross axis:center,flex-start,flex-end,stretch(default),baseline. [S1]align-content— aligns entire WRAPPED LINES (not individual items) whenflex-wrap:wrapis active; distinct fromalign-items. [S1]- Perfect centering recipe —
justify-content:center+align-items:centertogether on one flex container. [S1]
📖 세부 내용 (Details)
- Basic flex container:
<div class="w3-flex" style="gap:8px"><div>1</div><div>2</div><div>3</div></div>. [S1] - Reversed direction:
<div class="w3-flex" style="flex-direction:row-reverse">. [S1] - Baseline alignment (items with different font sizes align by text baseline, not box edge):
<div class="w3-flex" style="align-items:baseline">. [S1] - Perfect centering:
<div class="w3-flex" style="height:300px;justify-content:center;align-items:center">. [S1]
⚖️ 모순 및 업데이트 (Contradictions & updates)
- align-content와 align-items의 차이: align-items는 개별 아이템을, align-content는 줄바꿈된 전체 라인을 정렬한다는 점이 구분됨(flex-wrap:wrap 상태에서만 의미가 있음). [S1]
🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — justify-content+align-items를 함께 center로 설정하는 "완벽한 중앙 정렬" 레시피가 실전에서 가장 자주 쓰이는 플렉스박스 패턴이다. [S1]
💻 코드 패턴 (Code patterns)
Perfect centering with two flexbox properties (HTML/CSS):
<div class="w3-flex" style="height:300px;justify-content:center;align-items:center">
<div>1</div><div>2</div><div>3</div>
</div>
✅ 검증 상태 및 신뢰도
- 상태: draft
- 검증 단계: conceptual
- 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
- 신뢰 점수: 0.88
- 중복 검사 결과: 신규 생성 (New discovery)
🔗 지식 그래프 (Knowledge Graph)
- 상위/루트: W3.CSS Tutorial
- 관련 개념: W3CSS Grid, W3CSS Flex Items
- 참조 맥락: 1차원 레이아웃 컨테이너 — 개별 플렉스 아이템 속성(Flex Items) 챕터로 이어짐.
📚 출처 (Sources)
- [S1] W3Schools — W3.CSS Flexbox — https://www.w3schools.com/w3css/w3css_flexbox.asp
📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Flexbox" page (Astra wiki-curation, P-Reinforce v3.1 format).