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>
2026-06-23 19:21:18 +09:00
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+---
+id: css-table-alignment
+title: "CSS Table Alignment"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["table text-align", "table vertical-align", "table alignment", "th td alignment", "center table cell"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["css", "web", "frontend", "w3schools", "table", "text-align", "vertical-align"]
+raw_sources: ["https://www.w3schools.com/css/css_table_align.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSS Table Alignment]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`text-align` controls horizontal alignment and `vertical-align` controls vertical alignment of content inside `<th>` and `<td>` cells. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`text-align` = horizontal** — the CSS `text-align` property is used to set the horizontal alignment of the content in `<th>` or `<td>`. [S1]
+- **`vertical-align` = vertical** — the CSS `vertical-align` property sets the vertical alignment (like top, bottom, or middle) of the content in `<th>` or `<td>`. [S1]
+- **Defaults for headers vs data** — by default, the content of `<th>` elements is center-aligned and the content of `<td>` elements is left-aligned. [S1]
+- **Default vertical alignment** — by default, the vertical alignment of the content in a table is middle (for both `<th>` and `<td>` elements). [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Horizontal values** — `text-align` accepts `left` (aligns text to the left), `right` (aligns text to the right), and `center` (centers the text). [S1]
+- **Vertical sizing pairing** — to make a vertical alignment visible, give the cell a `height` and then set `vertical-align` (e.g. `bottom`). [S1]
+
+## 📖 세부 내용 (Details)
+**Horizontal Alignment**
+The CSS `text-align` property is used to set the horizontal alignment of the content in `<th>` or `<td>`. Property values: [S1]
+- `left` — aligns the text to the left
+- `right` — aligns the text to the right
+- `center` — centers the text
+
+**Note:** By default, the content of `<th>` elements is center-aligned and the content of `<td>` elements is left-aligned. [S1]
+
+Center the content of `<td>` elements: [S1]
+```css
+td {
+  text-align: center;
+}
+```
+
+Left-align the content of `<th>` elements: [S1]
+```css
+th {
+  text-align: left;
+}
+```
+
+**Vertical Alignment**
+The CSS `vertical-align` property sets the vertical alignment (like top, bottom, or middle) of the content in `<th>` or `<td>`. [S1]
+
+**Note:** By default, the vertical alignment of the content in a table is middle (for both `<th>` and `<td>` elements). [S1]
+
+The example below sets the vertical text alignment to bottom for `<td>` elements: [S1]
+```css
+td {
+  height: 50px;
+  vertical-align: bottom;
+}
+```
+
+The source illustrates these rules with sample data tables containing Firstname/Lastname/Savings columns (e.g. Peter Griffin / $100, Lois Griffin / $150, Joe Swanson / $300). [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own examples are the applied cases: centering `<td>` content, left-aligning `<th>` content, and bottom vertical alignment of `<td>` with a 50px height. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Horizontal alignment (language: CSS):
+```css
+td {
+  text-align: center;
+}
+```
+Vertical alignment (language: CSS):
+```css
+td {
+  height: 50px;
+  vertical-align: bottom;
+}
+```
+
+## ⚖️ 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:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[CSS Tutorial]]
+- **관련 개념:** [[CSS Table Size]], [[CSS Table Styling]], [[CSS Table Responsive]]
+- **참조 맥락:** Referenced whenever aligning header or data content inside an HTML table.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — CSS Table Alignment — https://www.w3schools.com/css/css_table_align.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Table Alignment" page (Astra wiki-curation, P-Reinforce v3.1 format).