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-styles
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title: "HTML Styles"
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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: ["style attribute", "inline style", "background-color", "color", "font-family", "font-size", "text-align"]
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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", "w3schools", "styles", "css"]
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raw_sources: ["https://www.w3schools.com/html/html_styles.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[HTML Styles]]
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## 🎯 한 줄 통찰 (One-line insight)
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The HTML `style` attribute adds inline styling to an element using the syntax `style="property:value;"`, controlling color, font, size, and alignment. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`style` attribute** — used to add styles to an element such as color, font, and size. [S1]
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- **Syntax** — `<tagname style="property:value;">`, where the property is a CSS property and the value is a CSS value. [S1]
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- **`background-color`** — sets the background color of an element (or the whole page when set on `<body>`). [S1]
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- **`color`** — sets the text color. [S1]
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- **`font-family`** — sets the font of the text. [S1]
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- **`font-size`** — sets the size of the text. [S1]
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- **`text-align`** — sets the horizontal alignment of the text. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **`property:value;` pairs** — each declaration is a CSS property/value pair ending with a semicolon. [S1]
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- **Page-wide vs. per-element** — styling `<body>` affects the whole page; styling an individual element affects only it. [S1]
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- **Relative sizing** — `font-size` can use percentages (e.g. `300%`, `160%`). [S1]
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## 📖 세부 내용 (Details)
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**The HTML Style Attribute**
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Setting the style of an HTML element can be done with the `style` attribute. The HTML `style` attribute has the following syntax: [S1]
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```html
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<tagname style="property:value;">
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```
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The property is a CSS property, and the value is a CSS value. [S1]
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**Background Color**
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The CSS `background-color` property defines the background color for an HTML element. Set the background color for the whole page: [S1]
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```html
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<body style="background-color:powderblue;">
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<h1>This is a heading</h1>
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<p>This is a paragraph.</p>
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</body>
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```
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Set background color for two different elements: [S1]
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```html
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<body>
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<h1 style="background-color:powderblue;">This is a heading</h1>
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<p style="background-color:tomato;">This is a paragraph.</p>
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</body>
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```
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**Text Color**
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The CSS `color` property defines the text color for an HTML element: [S1]
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```html
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<h1 style="color:blue;">This is a heading</h1>
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<p style="color:red;">This is a paragraph.</p>
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```
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**Fonts**
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The CSS `font-family` property defines the font to be used for an HTML element: [S1]
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```html
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<h1 style="font-family:verdana;">This is a heading</h1>
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<p style="font-family:courier;">This is a paragraph.</p>
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```
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**Text Size**
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The CSS `font-size` property defines the text size for an HTML element: [S1]
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```html
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<h1 style="font-size:300%;">This is a heading</h1>
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<p style="font-size:160%;">This is a paragraph.</p>
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```
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**Text Alignment**
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The CSS `text-align` property defines the horizontal text alignment for an HTML element: [S1]
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```html
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<h1 style="text-align:center;">Centered Heading</h1>
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<p style="text-align:center;">Centered paragraph.</p>
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```
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**Chapter Summary**
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- Use the `style` attribute for styling HTML elements. [S1]
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- Use `background-color` for background color. [S1]
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- Use `color` for text colors. [S1]
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- Use `font-family` for text fonts. [S1]
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- Use `font-size` for text sizes. [S1]
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- Use `text-align` for text alignment. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The examples above demonstrate inline styling applied directly to `<body>`, `<h1>`, and `<p>` elements — the simplest way to color, size, and align content without a separate stylesheet. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Style attribute syntax (HTML):
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```html
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<tagname style="property:value;">
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```
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Color, font, size, and alignment on a paragraph:
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```html
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<p style="color:red; font-family:courier; font-size:160%; text-align:center;">Styled paragraph.</p>
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```
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Page-wide background color:
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```html
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<body style="background-color:powderblue;">
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source. (The page teaches inline `style` as the introductory styling mechanism; CSS stylesheets are covered separately.) [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 Attributes]], [[HTML Formatting]], [[HTML Headings]], [[HTML Basic]]
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- **참조 맥락:** Referenced whenever applying inline visual styling (color, font, size, alignment) to elements.
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## 📚 출처 (Sources)
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- [S1] W3Schools — HTML Styles — https://www.w3schools.com/html/html_styles.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "HTML Styles" page (Astra wiki-curation, P-Reinforce v3.1 format).
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