2nd/10_Wiki/Topic_Programming/Topic_CSS/CSS_User_Interface.md

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
css-user-interface	CSS User Interface	Frontend	draft	conceptual		resize property outline-offset resizable element user interface properties resize textarea CSS UI		B	0.88	2026-06-23	2026-06-23			css web frontend w3schools user-interface resize outline	https://www.w3schools.com/css/css3_user_interface.asp

CSS User Interface

🎯 한 줄 통찰 (One-line insight)

The CSS user-interface properties cover resize (whether and how a user can drag-resize an element) and outline-offset (the gap between an outline and the element's border), where the outline sits outside the box and does not affect the element's dimensions. [S1]

🧠 핵심 개념 (Core concepts)

• resize — the resize property specifies if (and how) an element can be resized by a user. [S1]
• resize values — horizontal (resize the width), vertical (resize the height), both (resize in both directions), and none (not resizable). [S1]
• outline-offset — the outline-offset property adds a space between an outline and the edge/border of an element. [S1]
• Outline is not a border — unlike a border, the outline is drawn outside the element's border, may overlap other content, and is NOT part of the element's dimensions — the element's total width and height are not affected by the outline width. [S1]

🧩 추출된 패턴 (Extracted patterns)

• Resize needs overflow — resize is paired with overflow: auto; so the resizable box scrolls its content correctly. [S1]
• Lock textarea sizing — textarea { resize: none; } disables the browser default that lets users drag-resize a textarea. [S1]
• Spaced highlight ring — outline + outline-offset produces a detached highlight ring around an element without changing its layout box. [S1]

📖 세부 내용 (Details)

CSS Resize [S1] The resize property specifies if (and how) an element can be resized by a user. Its values are:

• horizontal — the user can resize the element horizontally (the width).
• vertical — the user can resize the element vertically (the height).
• both — the user can resize the element both vertically and horizontally.
• none — the user cannot resize the element.

Resize only the width:

div {
  resize: horizontal;
  overflow: auto;
}

Resize only the height:

div {
  resize: vertical;
  overflow: auto;
}

Resize both width and height:

div {
  resize: both;
  overflow: auto;
}

Disable resize in a textarea (browsers normally let users resize it):

textarea {
  resize: none;
}

CSS Outline Offset [S1] The outline-offset property adds a space between an outline and the edge/border of an element.

Note: Outline differs from borders! Unlike border, the outline is drawn outside the element's border, and may overlap other content. Also, the outline is NOT a part of the element's dimensions; the element's total width and height is not affected by the width of the outline.

div.ex1 {
  margin: 20px;
  border: 1px solid black;
  outline: 4px solid red;
  outline-offset: 15px;
}

div.ex2 {
  margin: 10px;
  border: 1px solid black;
  outline: 5px dashed blue;
  outline-offset: 5px;
}

CSS User Interface Properties [S1]

Property	Description
outline-offset	Adds space between an outline and the edge or border of an element
resize	Specifies whether or not an element is resizable by the user

🛠️ 적용 사례 (Applied in summary)

The page's examples are the applied cases: div elements made resizable horizontally / vertically / both (each with overflow: auto), a textarea with resize disabled, and two divs demonstrating offset outlines. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Resizable element (language: CSS):

div {
  resize: both;
  overflow: auto;
}

Disable textarea resize (language: CSS):

textarea {
  resize: none;
}

Offset outline (language: CSS):

div.ex1 {
  border: 1px solid black;
  outline: 4px solid red;
  outline-offset: 15px;
}

⚖️ 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 Outline, CSS Overflow, CSS Forms, CSS Box Model
• 참조 맥락: Referenced when controlling user-resizable boxes or drawing spaced focus/highlight outlines.

📚 출처 (Sources)

• [S1] W3Schools — CSS User Interface — https://www.w3schools.com/css/css3_user_interface.asp

📝 변경 이력 (Change history)

• 2026-06-23: Initial draft synthesized from the W3Schools "CSS User Interface" page (Astra wiki-curation, P-Reinforce v3.1 format).