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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id: css-user-interface
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title: "CSS User Interface"
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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: ["resize property", "outline-offset", "resizable element", "user interface properties", "resize textarea", "CSS UI"]
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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", "user-interface", "resize", "outline"]
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raw_sources: ["https://www.w3schools.com/css/css3_user_interface.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS User Interface]]
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## 🎯 한 줄 통찰 (One-line insight)
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The CSS user-interface properties cover `resize` (whether and how a user can drag-resize an element) and `outline-offset` (the gap between an outline and the element's border), where the outline sits outside the box and does not affect the element's dimensions. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **resize** — the `resize` property specifies if (and how) an element can be resized by a user. [S1]
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- **resize values** — `horizontal` (resize the width), `vertical` (resize the height), `both` (resize in both directions), and `none` (not resizable). [S1]
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- **outline-offset** — the `outline-offset` property adds a space between an outline and the edge/border of an element. [S1]
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- **Outline is not a border** — unlike a border, the outline is drawn outside the element's border, may overlap other content, and is NOT part of the element's dimensions — the element's total width and height are not affected by the outline width. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Resize needs overflow** — `resize` is paired with `overflow: auto;` so the resizable box scrolls its content correctly. [S1]
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- **Lock textarea sizing** — `textarea { resize: none; }` disables the browser default that lets users drag-resize a textarea. [S1]
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- **Spaced highlight ring** — `outline` + `outline-offset` produces a detached highlight ring around an element without changing its layout box. [S1]
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## 📖 세부 내용 (Details)
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**CSS Resize** [S1]
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The `resize` property specifies if (and how) an element can be resized by a user. Its values are:
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- `horizontal` — the user can resize the element horizontally (the width).
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- `vertical` — the user can resize the element vertically (the height).
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- `both` — the user can resize the element both vertically and horizontally.
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- `none` — the user cannot resize the element.
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Resize only the width:
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```css
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div {
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resize: horizontal;
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overflow: auto;
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}
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```
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Resize only the height:
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```css
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div {
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resize: vertical;
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overflow: auto;
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}
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```
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Resize both width and height:
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```css
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div {
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resize: both;
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overflow: auto;
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}
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```
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Disable resize in a textarea (browsers normally let users resize it):
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```css
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textarea {
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resize: none;
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}
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```
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**CSS Outline Offset** [S1]
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The `outline-offset` property adds a space between an outline and the edge/border of an element.
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> Note: Outline differs from borders! Unlike border, the outline is drawn outside the element's border, and may overlap other content. Also, the outline is NOT a part of the element's dimensions; the element's total width and height is not affected by the width of the outline.
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```css
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div.ex1 {
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margin: 20px;
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border: 1px solid black;
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outline: 4px solid red;
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outline-offset: 15px;
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}
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div.ex2 {
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margin: 10px;
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border: 1px solid black;
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outline: 5px dashed blue;
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outline-offset: 5px;
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}
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```
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**CSS User Interface Properties** [S1]
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| Property | Description |
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|----------|-------------|
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| outline-offset | Adds space between an outline and the edge or border of an element |
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| resize | Specifies whether or not an element is resizable by the user |
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## 🛠️ 적용 사례 (Applied in summary)
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The page's examples are the applied cases: `div` elements made resizable horizontally / vertically / both (each with `overflow: auto`), a `textarea` with resize disabled, and two `div`s demonstrating offset outlines. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Resizable element (language: CSS):
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```css
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div {
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resize: both;
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overflow: auto;
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}
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```
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Disable textarea resize (language: CSS):
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```css
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textarea {
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resize: none;
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}
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```
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Offset outline (language: CSS):
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```css
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div.ex1 {
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border: 1px solid black;
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outline: 4px solid red;
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outline-offset: 15px;
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}
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```
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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 Outline]], [[CSS Overflow]], [[CSS Forms]], [[CSS Box Model]]
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- **참조 맥락:** Referenced when controlling user-resizable boxes or drawing spaced focus/highlight outlines.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS User Interface — https://www.w3schools.com/css/css3_user_interface.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS User Interface" page (Astra wiki-curation, P-Reinforce v3.1 format).
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