2nd/10_Wiki/Topic_CSS/CSS_Gradients_Radial.md

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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
css-radial-gradients	CSS Radial Gradients	Frontend	draft	conceptual		radial-gradient CSS radial gradient repeating-radial-gradient circle gradient ellipse gradient		B	0.9	2026-06-23	2026-06-23			css web frontend w3schools gradients radial-gradient background-image	https://www.w3schools.com/css/css3_gradients_radial.asp

CSS Radial Gradients

🎯 한 줄 통찰 (One-line insight)

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]

🧠 핵심 개념 (Core concepts)

• Radial = defined by a center point — a radial gradient is defined by its center and radiates the color transition outward. [S1]
• At least two color stops — like a linear gradient, a radial gradient must have at least two color stops. [S1]
• Default shape, size, and position — the defaults are shape = ellipse, size = farthest-corner, position = center. [S1]
• Color-stop spacing — color stops can be evenly spaced (the default) or assigned percentages to space them differently. [S1]
• Shape and size are controllable — shape can be circle or ellipse, and size keywords control how far the gradient extends. [S1]

🧩 추출된 패턴 (Extracted patterns)

• Even-stops pattern — radial-gradient(color1, color2, color3) for default evenly spaced stops. [S1]
• Spaced-stops pattern — assign percentages (color 5%, color 15%...) to control stop placement. [S1]
• Shape pattern — prepend circle (or ellipse) to force the shape. [S1]
• Size-keyword pattern — use closest-side/farthest-side/closest-corner/farthest-corner plus at <position> to control extent and center. [S1]
• Repeating pattern — repeating-radial-gradient() repeats a percentage-defined sequence. [S1]

📖 세부 내용 (Details)

Syntax [S1]

background-image: radial-gradient(shape size at position, start-color, ..., last-color);

By default the shape is ellipse, the size is farthest-corner, and the position is center.

Evenly Spaced Color Stops (this is default) [S1]

#grad {
  background-image: radial-gradient(red, yellow, green);
}

Differently Spaced Color Stops [S1]

#grad {
  background-image: radial-gradient(red 5%, yellow 15%, green 60%);
}

Set Shape [S1] The shape parameter defines the shape. It can take the value circle or ellipse; the default value is ellipse. This example uses circle:

#grad {
  background-image: radial-gradient(circle, red, yellow, green);
}

Use of Different Size Keywords [S1] The size parameter defines the size of the gradient. It can take four values: closest-side, farthest-side, closest-corner, and farthest-corner.

#grad1 {
  background-image: radial-gradient(closest-side at 70% 60%, red, yellow, black);
}

#grad2 {
  background-image: radial-gradient(farthest-side at 70% 60%, red, yellow, black);
}

Repeating a radial-gradient [S1] The repeating-radial-gradient() function is used to repeat radial gradients.

#grad {
  background-image: repeating-radial-gradient(red, yellow 10%, green 15%);
}

🛠️ 적용 사례 (Applied in summary)

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.

💻 코드 패턴 (Code patterns)

Default radial gradient (language: CSS):

#grad {
  background-image: radial-gradient(red, yellow, green);
}

Circle with positioned size keyword:

#grad1 {
  background-image: radial-gradient(closest-side at 70% 60%, red, yellow, black);
}

Repeating radial gradient:

#grad {
  background-image: repeating-radial-gradient(red, yellow 10%, green 15%);
}

⚖️ 비교 및 선택 기준 (Comparison & decision criteria)

• 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]
• 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]
• Even vs differently spaced stops — omit percentages for evenly spaced stops; supply percentages to bias where each color sits. [S1]
• Single vs repeating — use repeating-radial-gradient() when the percentage sequence should tile outward. [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: 0.90
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: CSS Tutorial
• 관련 개념: CSS Linear Gradients, CSS Conic Gradients, CSS Box Shadow
• 참조 맥락: Referenced whenever a center-out color background (spotlight/glow effect) is needed via background-image.

📚 출처 (Sources)

• [S1] W3Schools — CSS Radial Gradients — https://www.w3schools.com/css/css3_gradients_radial.asp

📝 변경 이력 (Change history)

• 2026-06-23: Initial draft synthesized from the W3Schools "CSS Radial Gradients" page (Astra wiki-curation, P-Reinforce v3.1 format).