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>
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id: css-input-focus-and-icons
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title: "CSS Input Focus and Icons"
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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: ["CSS form focus", "input focus styling", "focus pseudo-class", "search input icon", "animated search input"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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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: ["css", "web", "frontend", "w3schools", "forms", "focus", "pseudo-class"]
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raw_sources: ["https://www.w3schools.com/css/css_form_focus.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Input Focus and Icons]]
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## 🎯 한 줄 통찰 (One-line insight)
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The `:focus` pseudo-class lets you restyle an input the moment it is clicked into, and combined with `outline: none;`, `background-image`, and `transition`, you can build clean focus states, icon-bearing fields, and animated search boxes. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Default focus outline** — by default, some browsers add a blue outline around an input when it gets focus (is clicked on); `outline: none;` removes this behavior. [S1]
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- **`:focus` selector** — used to do something with an input field when it gets focus. [S1]
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- **Input icons** — an icon can be placed inside an input using `background-image` positioned via `background-position`, with a large left padding reserving space for the icon. [S1]
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- **Animated focus** — the `transition` property can animate input changes (e.g., width) when the field gains focus. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Reset-then-restyle on focus** — remove the native outline, then express focus visually through your own property (background color, border). [S1]
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- **Icon = background-image + padding** — render a decorative/functional icon by layering a non-repeating background image and reserving its space with `padding-left`. [S1]
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- **Focus-driven animation** — declare `transition` on the base selector and the target value on the `:focus` selector so the change eases in. [S1]
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## 📖 세부 내용 (Details)
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**Style Input with Focus**
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By default, some browsers will add a blue outline around the input when it gets focus (clicked on). You can remove this behavior by adding `outline: none;` to the input. Use the `:focus` selector to do something with the input field when it gets focus. [S1]
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Change the background color to lightblue on focus: [S1]
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```css
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input[type=text]:focus {
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background-color: lightblue;
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}
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```
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Add a border on focus: [S1]
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```css
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input[type=text]:focus {
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border: 3px solid #555;
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}
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```
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**Style Input with Icon/Image**
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If you want an icon inside the input, use the `background-image` property and position it with the `background-position` property. Also notice that we add a large left padding to reserve the space of the icon: [S1]
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```css
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input[type=text] {
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background-color: white;
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background-image: url('searchicon.png');
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background-position: 10px 10px;
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background-repeat: no-repeat;
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padding-left: 40px;
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}
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```
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**Animated Search Input**
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In this example we use the CSS `transition` property to animate the width of the search input when it gets focus. You will learn more about the `transition` property later, in the CSS Transitions chapter. [S1]
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```css
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input[type=text] {
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transition: width 0.4s ease-in-out;
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}
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input[type=text]:focus {
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width: 100%;
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}
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```
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own examples are the applied cases: a lightblue focus background, a 3px focus border, a search field with an embedded `searchicon.png`, and a search box that animates to full width on focus. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Restyle on focus (language: CSS):
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```css
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input[type=text]:focus {
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background-color: lightblue;
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}
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```
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Icon inside input (language: CSS):
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```css
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input[type=text] {
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background-image: url('searchicon.png');
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background-position: 10px 10px;
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background-repeat: no-repeat;
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padding-left: 40px;
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}
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source.
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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:** 0.88
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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:** [[CSS Tutorial]]
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- **관련 개념:** [[CSS Other Form Elements]], [[CSS Forms]], [[CSS Pseudo-classes]], [[CSS Transitions]]
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- **참조 맥락:** Referenced when styling interactive form fields and search inputs for visible focus feedback.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Input Focus and Icons — https://www.w3schools.com/css/css_form_focus.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Input Focus and Icons" page (Astra wiki-curation, P-Reinforce v3.1 format).
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