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: html-video
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title: "HTML Video"
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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: ["video element", "<video>", "HTML5 video", "embed video", "video controls"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.90
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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: ["html", "web", "frontend", "media", "video", "html5", "w3schools"]
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raw_sources: ["https://www.w3schools.com/html/html5_video.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[HTML Video]]
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## 🎯 한 줄 통찰 (One-line insight)
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The HTML `<video>` element embeds video natively in a page; multiple `<source>` children let the browser pick the first format it supports, with `controls`, `autoplay`, and `muted` attributes governing playback. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`<video>` shows video** — it embeds a video player directly, with `width` and `height` defining its size. [S1]
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- **`controls` adds the UI** — the `controls` attribute adds video controls such as play, pause, and volume. [S1]
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- **Multiple `<source>` for fallback** — list several `<source>` elements with different formats; the browser uses the first format it recognizes. Text between the tags is shown if none is supported. [S1]
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- **`autoplay` starts on load**, but Chromium browsers do not allow autoplay in most cases. [S1]
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- **`muted` enables autoplay** — adding `muted` after `autoplay` lets the video start automatically (muted autoplay is always allowed). [S1]
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- **Three HTML-standard formats** — MP4, WebM, and Ogg. [S1]
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- **Scriptable** — DOM methods, properties, and events let JavaScript load, play, and pause videos and set duration and volume. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Multi-source fallback pattern** — `<video controls>` wrapping ordered `<source>` elements + fallback text. [S1]
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- **Sized player pattern** — always set `width`/`height` to reserve layout space. [S1]
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- **Muted autoplay pattern** — `autoplay muted` to start playback within browser autoplay policies. [S1]
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## 📖 세부 내용 (Details)
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**The HTML `<video>` element** — used to show a video on a web page. To show a video, use the `<video>` element. The `controls` attribute adds video controls (play, pause, volume). It is good practice to include `width` and `height`; if not set, the page may flicker while the video loads. Multiple `<source>` elements link to different video files — the browser will use the first recognized format. The text between `<video>` and `</video>` is shown only in browsers that do not support the element. [S1]
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```html
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<video width="320" height="240" controls>
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<source src="movie.mp4" type="video/mp4">
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<source src="movie.ogg" type="video/ogg">
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Your browser does not support the video tag.
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</video>
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```
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**HTML `<video>` autoplay** — to start a video automatically, use the `autoplay` attribute. Note: Chromium browsers do not allow autoplay in most cases; however, muted autoplay is always allowed: [S1]
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```html
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<video width="320" height="240" autoplay>
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<source src="movie.mp4" type="video/mp4">
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<source src="movie.ogg" type="video/ogg">
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Your browser does not support the video tag.
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</video>
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```
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Add `muted` after `autoplay` to let the video start playing automatically (but muted): [S1]
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```html
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<video width="320" height="240" autoplay muted>
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<source src="movie.mp4" type="video/mp4">
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<source src="movie.ogg" type="video/ogg">
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Your browser does not support the video tag.
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</video>
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```
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**HTML video formats** — there are three supported video formats: MP4, WebM, and Ogg. The MIME (media) type for each: [S1]
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| File Format | Media Type |
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|---|---|
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| MP4 | video/mp4 |
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| WebM | video/webm |
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| Ogg | video/ogg |
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MP4 has the broadest browser support. [S1]
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**HTML video — methods, properties, and events** — HTML defines DOM methods, properties, and events for the `<video>` element. This allows you to load, play, and pause videos, as well as set duration and volume, and includes DOM events that can notify you when a video begins to play, is paused, etc. The source directs to the "HTML Audio/Video DOM Reference" for the full list. [S1]
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**HTML video tags** — [S1]
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| Tag | Description |
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|---|---|
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| `<video>` | Defines a video or movie |
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| `<source>` | Defines multiple media resources for media elements, such as `<video>` and `<audio>` |
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| `<track>` | Defines text tracks in media players |
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## 🛠️ 적용 사례 (Applied in summary)
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The examples above are the canonical applied uses: a controlled player offering MP4 with an Ogg fallback, an autoplay variant, and a muted-autoplay variant that complies with modern browser autoplay policies. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Standard video player with fallback (HTML):
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```html
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<video width="320" height="240" controls>
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<source src="movie.mp4" type="video/mp4">
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<source src="movie.ogg" type="video/ogg">
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Your browser does not support the video tag.
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</video>
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```
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Muted autoplay (HTML):
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```html
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<video width="320" height="240" autoplay muted>
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<source src="movie.mp4" type="video/mp4">
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</video>
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source. The notable real-world constraint is browser autoplay policy: `autoplay` alone is blocked by Chromium browsers in most cases, so `muted` is required for reliable autoplay. [S1]
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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:** [[HTML Tutorial]]
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- **관련 개념:** [[HTML Audio]], [[HTML Media]], [[HTML Plug-ins]], [[HTML5]]
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- **참조 맥락:** Referenced when embedding playable video with cross-browser format fallbacks.
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## 📚 출처 (Sources)
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- [S1] W3Schools — HTML Video — https://www.w3schools.com/html/html5_video.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "HTML Video" page (Astra wiki-curation, P-Reinforce v3.1 format).
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