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koriweb 9609c04755 docs(10_Wiki): W3Schools 위키화 — HTML/CSS/JavaScript(core)

W3Schools 튜토리얼을 P-Reinforce v3.1 포맷으로 위키화(영어 본문, 한/영 섹션 헤더).
- Topic_HTML: 59문서 (튜토리얼+예제, 레퍼런스/메타 제외)
- Topic_CSS: 190문서 (메인 + Advanced/Flexbox/Grid/RWD 전체)
- Topic_JavaScript: 120문서 (코어 언어; Temporal/DOM상세/BOM/WebAPI/AJAX/jQuery/Graphics 등은 후속)
각 폴더 00_INDEX.md(MOC) 포함. 코드 verbatim, 미확인분은 "Not found in source" 표기.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-06-23 19:21:18 +09:00

4.1 KiB

Raw Blame History

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

title

CSS Image Effects

🎯 한 줄 통찰 (One-line insight)

The W3Schools "CSS Image Effects" page covers two effects: making images transparent with the opacity property, and overlaying text on an image positioned at the corners or center. [S1]

🧠 핵심 개념 (Core concepts)

Image opacity — the opacity property controls how transparent an image is, taking values from 0.0 (fully transparent) to 1.0 (fully opaque). [S1]
Partial transparency — values between, such as 0.5, render the image partially see-through. [S1]
Text on an image — text can be overlaid on an image and positioned at the top left, top right, bottom left, bottom right, or centered. [S1]

🧩 추출된 패턴 (Extracted patterns)

Opacity as a 0–1 dial — transparency is a single continuous value where lower means more see-through, useful for hover dimming or watermark effects. [S1]
Corner-anchored overlay — positioning text over an image relies on a positioned container with the text element placed against a chosen corner or centered. [S1]

📖 세부 내용 (Details)

Image opacity / transparency The opacity property specifies the transparency of an image. It accepts a value from 0.0 to 1.0: the lower the value, the more transparent the image. A value of 0.0 makes the image fully transparent, an intermediate value such as 0.5 makes it partially transparent, and 1.0 is the default (fully opaque). [S1]

Image text positioning Text can be placed on top of an image and positioned in different spots: top left, top right, bottom left, bottom right, or centered. The fetched content describes these positioning options but does not include the inline CSS declaration blocks for each placement — those appear only behind the page's "Try it Yourself" examples. The exact per-position CSS is "Not found in source". [S1]

Note: The page title "CSS Image Effects" on W3Schools does NOT cover image reflection (box-reflect). The fetched content confirms the page is limited to image opacity/transparency and image text positioning. [S1]

🛠️ 적용 사례 (Applied in summary)

The source's applied cases are the opacity-based transparency demos (full, partial, and full opacity) and the text-over-image positioning demos. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Image transparency dial (language: CSS):

img {
  opacity: 0.5;
}

⚖️ 모순 및 업데이트 (Contradictions & updates)

No contradictions found in the source. Note that the per-corner text-positioning CSS was not present inline in the fetched content (marked "Not found in source" above).

✅ 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: 0.85
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: CSS Tutorial
관련 개념: CSS Image Hover, CSS Image Filters, CSS Image Styling, CSS Position
참조 맥락: Referenced when dimming images via opacity or labeling images with overlaid text.

📚 출처 (Sources)

[S1] W3Schools — CSS Image Effects — https://www.w3schools.com/css/css3_images_effects.asp

📝 변경 이력 (Change history)

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

4.1 KiB Raw Blame History Unescape Escape