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-radial-gradients
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title: "CSS Radial Gradients"
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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: ["radial-gradient", "CSS radial gradient", "repeating-radial-gradient", "circle gradient", "ellipse gradient"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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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", "gradients", "radial-gradient", "background-image"]
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raw_sources: ["https://www.w3schools.com/css/css3_gradients_radial.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Radial Gradients]]
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## 🎯 한 줄 통찰 (One-line insight)
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A radial gradient (`radial-gradient()`) is defined by its center and spreads color stops outward; by default it is an ellipse, sized `farthest-corner`, centered, and it is applied through the `background-image` property. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Radial = defined by a center point** — a radial gradient is defined by its center and radiates the color transition outward. [S1]
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- **At least two color stops** — like a linear gradient, a radial gradient must have at least two color stops. [S1]
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- **Default shape, size, and position** — the defaults are shape = `ellipse`, size = `farthest-corner`, position = `center`. [S1]
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- **Color-stop spacing** — color stops can be evenly spaced (the default) or assigned percentages to space them differently. [S1]
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- **Shape and size are controllable** — shape can be `circle` or `ellipse`, and size keywords control how far the gradient extends. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Even-stops pattern** — `radial-gradient(color1, color2, color3)` for default evenly spaced stops. [S1]
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- **Spaced-stops pattern** — assign percentages (`color 5%`, `color 15%`...) to control stop placement. [S1]
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- **Shape pattern** — prepend `circle` (or `ellipse`) to force the shape. [S1]
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- **Size-keyword pattern** — use `closest-side`/`farthest-side`/`closest-corner`/`farthest-corner` plus `at <position>` to control extent and center. [S1]
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- **Repeating pattern** — `repeating-radial-gradient()` repeats a percentage-defined sequence. [S1]
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## 📖 세부 내용 (Details)
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**Syntax** [S1]
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```
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background-image: radial-gradient(shape size at position, start-color, ..., last-color);
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```
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By default the shape is `ellipse`, the size is `farthest-corner`, and the position is `center`.
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**Evenly Spaced Color Stops (this is default)** [S1]
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```css
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#grad {
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background-image: radial-gradient(red, yellow, green);
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}
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```
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**Differently Spaced Color Stops** [S1]
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```css
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#grad {
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background-image: radial-gradient(red 5%, yellow 15%, green 60%);
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}
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```
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**Set Shape** [S1]
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The shape parameter defines the shape. It can take the value `circle` or `ellipse`; the default value is `ellipse`. This example uses `circle`:
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```css
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#grad {
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background-image: radial-gradient(circle, red, yellow, green);
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}
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```
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**Use of Different Size Keywords** [S1]
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The size parameter defines the size of the gradient. It can take four values: `closest-side`, `farthest-side`, `closest-corner`, and `farthest-corner`.
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```css
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#grad1 {
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background-image: radial-gradient(closest-side at 70% 60%, red, yellow, black);
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}
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#grad2 {
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background-image: radial-gradient(farthest-side at 70% 60%, red, yellow, black);
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}
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```
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**Repeating a radial-gradient** [S1]
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The `repeating-radial-gradient()` function is used to repeat radial gradients.
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```css
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#grad {
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background-image: repeating-radial-gradient(red, yellow 10%, green 15%);
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}
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```
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own demonstrations (the `#grad`, `#grad1`, and `#grad2` elements showing even/spaced stops, circle shape, size keywords, and repeating gradients) serve as the applied examples. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Default radial gradient (language: CSS):
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```css
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#grad {
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background-image: radial-gradient(red, yellow, green);
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}
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```
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Circle with positioned size keyword:
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```css
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#grad1 {
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background-image: radial-gradient(closest-side at 70% 60%, red, yellow, black);
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}
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```
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Repeating radial gradient:
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```css
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#grad {
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background-image: repeating-radial-gradient(red, yellow 10%, green 15%);
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **`circle` vs `ellipse`** — `ellipse` is the default and stretches to the box's aspect ratio; choose `circle` when a perfectly round transition is wanted. [S1]
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- **Size keywords** — `closest-side`, `farthest-side`, `closest-corner`, and `farthest-corner` decide where the gradient's ending shape meets the box; `farthest-corner` is the default. [S1]
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- **Even vs differently spaced stops** — omit percentages for evenly spaced stops; supply percentages to bias where each color sits. [S1]
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- **Single vs repeating** — use `repeating-radial-gradient()` when the percentage sequence should tile outward. [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:** 0.90
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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 Linear Gradients]], [[CSS Conic Gradients]], [[CSS Box Shadow]]
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- **참조 맥락:** Referenced whenever a center-out color background (spotlight/glow effect) is needed via `background-image`.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Radial Gradients — https://www.w3schools.com/css/css3_gradients_radial.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Radial Gradients" page (Astra wiki-curation, P-Reinforce v3.1 format).
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