---
id: html-video
title: "HTML Video"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["video element", "<video>", "HTML5 video", "embed video", "video controls"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.90
created_at: 2026-06-23
updated_at: 2026-06-23
review_reason: ""
merge_history: []
tags: ["html", "web", "frontend", "media", "video", "html5", "w3schools"]
raw_sources: ["https://www.w3schools.com/html/html5_video.asp"]
applied_in: []
github_commit: ""
---

# [[HTML Video]]

## 🎯 한 줄 통찰 (One-line insight)
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]

## 🧠 핵심 개념 (Core concepts)
- **`<video>` shows video** — it embeds a video player directly, with `width` and `height` defining its size. [S1]
- **`controls` adds the UI** — the `controls` attribute adds video controls such as play, pause, and volume. [S1]
- **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]
- **`autoplay` starts on load**, but Chromium browsers do not allow autoplay in most cases. [S1]
- **`muted` enables autoplay** — adding `muted` after `autoplay` lets the video start automatically (muted autoplay is always allowed). [S1]
- **Three HTML-standard formats** — MP4, WebM, and Ogg. [S1]
- **Scriptable** — DOM methods, properties, and events let JavaScript load, play, and pause videos and set duration and volume. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Multi-source fallback pattern** — `<video controls>` wrapping ordered `<source>` elements + fallback text. [S1]
- **Sized player pattern** — always set `width`/`height` to reserve layout space. [S1]
- **Muted autoplay pattern** — `autoplay muted` to start playback within browser autoplay policies. [S1]

## 📖 세부 내용 (Details)
**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]
```html
<video width="320" height="240" controls>
  <source src="movie.mp4" type="video/mp4">
  <source src="movie.ogg" type="video/ogg">
Your browser does not support the video tag.
</video>
```

**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]
```html
<video width="320" height="240" autoplay>
  <source src="movie.mp4" type="video/mp4">
  <source src="movie.ogg" type="video/ogg">
Your browser does not support the video tag.
</video>
```

Add `muted` after `autoplay` to let the video start playing automatically (but muted): [S1]
```html
<video width="320" height="240" autoplay muted>
  <source src="movie.mp4" type="video/mp4">
  <source src="movie.ogg" type="video/ogg">
Your browser does not support the video tag.
</video>
```

**HTML video formats** — there are three supported video formats: MP4, WebM, and Ogg. The MIME (media) type for each: [S1]

| File Format | Media Type |
|---|---|
| MP4 | video/mp4 |
| WebM | video/webm |
| Ogg | video/ogg |

MP4 has the broadest browser support. [S1]

**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]

**HTML video tags** — [S1]

| Tag | Description |
|---|---|
| `<video>` | Defines a video or movie |
| `<source>` | Defines multiple media resources for media elements, such as `<video>` and `<audio>` |
| `<track>` | Defines text tracks in media players |

## 🛠️ 적용 사례 (Applied in summary)
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.

## 💻 코드 패턴 (Code patterns)
Standard video player with fallback (HTML):
```html
<video width="320" height="240" controls>
  <source src="movie.mp4" type="video/mp4">
  <source src="movie.ogg" type="video/ogg">
Your browser does not support the video tag.
</video>
```
Muted autoplay (HTML):
```html
<video width="320" height="240" autoplay muted>
  <source src="movie.mp4" type="video/mp4">
</video>
```

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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]

## ✅ 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:** [[HTML Tutorial]]
- **관련 개념:** [[HTML Audio]], [[HTML Media]], [[HTML Plug-ins]], [[HTML5]]
- **참조 맥락:** Referenced when embedding playable video with cross-browser format fallbacks.

## 📚 출처 (Sources)
- [S1] W3Schools — HTML Video — https://www.w3schools.com/html/html5_video.asp

## 📝 변경 이력 (Change history)
- 2026-06-23: Initial draft synthesized from the W3Schools "HTML Video" page (Astra wiki-curation, P-Reinforce v3.1 format).
