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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
| 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 | ||||||||||||
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| css-rwd-viewport | CSS RWD Viewport | Frontend | draft | conceptual |
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B | 0.89 | 2026-06-23 | 2026-06-23 |
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CSS RWD Viewport
🎯 한 줄 통찰 (One-line insight)
The viewport is the user's visible area of a web page, and adding a single <meta name="viewport"> tag tells the browser to match the page width to the device and set the initial zoom so content fits without horizontal scrolling. [S1]
🧠 핵심 개념 (Core concepts)
- Viewport definition — the viewport is the user's visible area of a web page, and it varies with the device (smaller on a phone than on a computer screen). [S1]
- The viewport meta tag — to give the browser instructions on how to control the page's dimensions and scaling, every web page should include the viewport
<meta>tag. [S1] width=device-width— sets the width of the page to follow the screen-width of the device. [S1]initial-scale=1.0— sets the initial zoom level when the page is first loaded by the browser. [S1]- No horizontal scrolling — users are used to scrolling websites vertically but not horizontally; forcing horizontal scrolling or zoom-out degrades the experience. [S1]
🧩 추출된 패턴 (Extracted patterns)
- Standard responsive header line — placing the viewport meta tag in the
<head>of every page is the baseline step for responsive web design. [S1] - Size content to the viewport — keep elements fluid rather than fixed-width so they never exceed the device's visible area. [S1]
📖 세부 내용 (Details)
What is The Viewport? The viewport is the user's visible area of a web page. The viewport varies with the device, and will be smaller on a mobile phone than on a computer screen. [S1]
Setting The Viewport
To give the browser instructions on how to control the page's dimensions and scaling, you should include the following <meta> viewport element in all your web pages: [S1]
<meta name="viewport" content="width=device-width, initial-scale=1.0">
This gives the browser instructions on how to control the page's dimensions and scaling. The width=device-width part sets the width of the page to follow the screen-width of the device (which will vary depending on the device). The initial-scale=1.0 part sets the initial zoom level when the page is first loaded by the browser. [S1]
The page demonstrates the visual difference between a page without the viewport meta tag and a page with it. Tip: If you are browsing this page with a phone or a tablet, you can click on the two links above to see the difference. (Those comparison demos are links/images only — no inline code.) [S1]
Size Content to The Viewport Users are used to scroll websites vertically both on desktop and mobile devices - but not horizontally! So, if the user is forced to scroll horizontally, or zoom out, to see the whole web page it results in a poor user experience. Some additional rules to follow: [S1]
- Do NOT use large fixed-width elements — For example, if an image has a width wider than the viewport, it causes the viewport to scroll horizontally. [S1]
- Do NOT let the content rely on a particular width to render well — Since screen dimensions vary widely between devices, content should not rely on a particular viewport width to render well. [S1]
- Use CSS media queries to apply different styling for small and large screens — Setting large absolute CSS widths for page elements will cause the elements to be too wide for smaller devices. Instead, consider using relative width values, such as
width: 100%. [S1]
🛠️ 적용 사례 (Applied in summary)
The meta viewport tag above is the page's own applied example — the one line W3Schools instructs to place in all web pages. No external project/commit applications found in the source.
💻 코드 패턴 (Code patterns)
The viewport meta tag (language: HTML):
<meta name="viewport" content="width=device-width, initial-scale=1.0">
⚖️ 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: 0.89
- 중복 검사 결과: 신규 생성 (New discovery)
🔗 지식 그래프 (Knowledge Graph)
- 상위/루트: CSS Tutorial
- 관련 개념: CSS RWD Grid View, CSS RWD Media Queries, CSS RWD Images
- 참조 맥락: The first technical step in responsive web design, referenced before media queries and fluid grids are applied.
📚 출처 (Sources)
- [S1] W3Schools — CSS RWD Viewport — https://www.w3schools.com/css/css_rwd_viewport.asp
📝 변경 이력 (Change history)
- 2026-06-23: Initial draft synthesized from the W3Schools "CSS RWD Viewport" page (Astra wiki-curation, P-Reinforce v3.1 format).