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>
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id: css-rwd-videos
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title: "CSS RWD Videos"
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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: ["responsive video", "max-width video", "RWD videos", "video scaling", "fluid video"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.87
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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", "responsive", "video"]
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raw_sources: ["https://www.w3schools.com/css/css_rwd_videos.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS RWD Videos]]
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## 🎯 한 줄 통찰 (One-line insight)
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A video is made responsive the same way an image is — `width: 100%` scales it up and down with its container, while `max-width: 100%` (with `height: auto`) scales it down without ever enlarging it beyond its original size. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`width: 100%`** — set on the video, makes it responsive and scale up and down with the container. [S1]
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- **`max-width: 100%`** — scales the video down if needed but never up to be larger than its original size; a better solution in many cases. [S1]
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- **`height: auto`** — paired with either width rule so the video keeps its proportions. [S1]
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- **Fills available space** — a video added with this styling will be resized to always take up all the available space. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Fluid video** — `video { max-width: 100%; height: auto; }` is the safe default, mirroring the responsive-image pattern. [S1]
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## 📖 세부 내용 (Details)
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**Using The width Property** — If the `width` property is set to 100%, the video player will be responsive and scale up and down: [S1]
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```css
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video {
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width: 100%;
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height: auto;
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}
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```
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Notice that in the example above, the video player can be scaled up to be larger than its original size. A better solution, in many cases, will be to use the `max-width` property instead. [S1]
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**Using The max-width Property** — If the `max-width` property is set to 100%, the video player will scale down if it has to, but never scale up to be larger than its original size: [S1]
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```css
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video {
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max-width: 100%;
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height: auto;
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}
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```
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**Add a Video to The Example Web Page** — Add a video to the example web page we used in the previous chapter. The video will be resized to always take up all the available space, using the same `max-width` styling approach. The Example box for this section presents only a "Try it Yourself" link with no additional inline code beyond the styling above — Not found in source. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The video examples apply the responsive styling to the example web page from the previous chapter so the video always takes up all available space. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Fluid video, no upscaling (language: CSS):
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```css
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video {
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max-width: 100%;
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height: auto;
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}
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```
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Scale-with-container video (language: CSS):
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```css
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video {
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width: 100%;
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height: auto;
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **`width: 100%` vs `max-width: 100%`** — `width: 100%` scales the video both up and down (can exceed original size); `max-width: 100%` scales down only and never beyond the original size — described as a better solution in many cases. [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:** 0.87
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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 RWD Images]], [[CSS RWD Media Queries]], [[CSS RWD Viewport]]
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- **참조 맥락:** Applies the same fluid-media technique as responsive images to the `<video>` element.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS RWD Videos — https://www.w3schools.com/css/css_rwd_videos.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS RWD Videos" page (Astra wiki-curation, P-Reinforce v3.1 format).
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