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3.5 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 | |||||||
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| howto-css-vertical-line | How To - Vertical Line | Web_Recipes | draft | conceptual |
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B | 0.8 | 2026-07-04 | 2026-07-04 |
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HOWTO CSS Vertical Line
🎯 한 줄 통찰 (One-line insight)
A "vertical line" isn't a special CSS shape primitive at all — it's an empty <div> with height set and ONLY a border-left declared (no other sides), and centering it uses a variant of the absolute-positioning trick already seen elsewhere: left: 50%; margin-left: -3px; (half of the 6px border width, negated) achieves the same "shift back by half my own size" effect that transform: translateX(-50%) would, just computed manually instead of automatically. [S1]
🧠 핵심 개념 (Core concepts)
border-leftonly, on an empty div —.vl { border-left: 6px solid green; height: 500px; }— no width, no content; the border alone forms the visible line. [S1]- Manual half-width offset for centering —
left: 50%; margin-left: -3px;(half of the 6px border, negated) recenters the line, sinceleft: 50%alone would place its LEFT EDGE at the midpoint rather than centering the line itself. [S1]
📖 세부 내용 (Details)
- Basic vertical line:
.vl { border-left: 6px solid green; height: 500px; }applied to an empty<div class="vl"></div>. [S1] - Centered version:
.vl { border-left: 6px solid green; height: 500px; position: absolute; left: 50%; margin-left: -3px; top: 0; }. [S1]
⚖️ 모순 및 업데이트 (Contradictions & updates)
- transform 대신 수동 margin 계산으로 중앙 정렬:
[[HOWTO CSS Center Vertical]]의transform: translate(-50%, -50%)가 자동으로 자기 자신의 절반만큼 되돌리는 것과 달리, 이 레시피는 테두리 두께(6px)의 절반인 -3px를 margin-left로 수동 계산해 동일한 효과를 낸다는 점이 확인됨 — 같은 목적을 자동 vs 수동 방식으로 각각 구현. [S1]
🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 초록색 6px 세로선을 만들고 화면 중앙에 배치하는 최소 예제가 원문에서 제시됨. [S1]
💻 코드 패턴 (Code patterns)
An empty div with only border-left, centered via manual margin offset (CSS):
.vl {
border-left: 6px solid green;
height: 500px;
position: absolute;
left: 50%;
margin-left: -3px; /* half of border-left width, negated */
top: 0;
}
✅ 검증 상태 및 신뢰도
- 상태: draft
- 검증 단계: conceptual
- 출처 신뢰도: B (W3Schools — widely used educational reference)
- 신뢰 점수: 0.80
- 중복 검사 결과: 신규 생성 (New discovery)
🔗 지식 그래프 (Knowledge Graph)
- 상위/루트: W3Schools HOW TO
- 관련 개념: HOWTO CSS Center Vertical, HOWTO CSS Dividers, HOWTO CSS Text Divider
- 참조 맥락: CSS Layout & Positioning 섹션.
📚 출처 (Sources)
- [S1] W3Schools — How To - Vertical Line — https://www.w3schools.com/howto/howto_css_vertical_line.asp
📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "How To - Vertical Line" recipe (Astra wiki-curation, P-Reinforce v3.1 format).