2nd/10_Wiki/Topic_CSS/CSS_Attribute_Selectors.md

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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
css-attribute-selectors	CSS Attribute Selectors	Frontend	draft	conceptual		attribute selector [attribute] selector [attribute=value] [attribute~=value] [attribute|=value]		B	0.89	2026-06-23	2026-06-23			css web frontend w3schools selectors attributes	https://www.w3schools.com/css/css_attribute_selectors.asp

CSS Attribute Selectors

🎯 한 줄 통찰 (One-line insight)

CSS attribute selectors use square brackets to target HTML elements by the presence or value of an attribute — from a plain [attribute] match through exact (=), word-list (~=), and hyphen-prefix (|=) matching. [S1]

🧠 핵심 개념 (Core concepts)

• Attribute selector — selects and styles HTML elements with a specific attribute, a specific attribute value, or both. [S1]
• Square-bracket syntax — attribute selectors are written inside square brackets []. [S1]
• [attribute] — selects elements that have the specified attribute, regardless of value. [S1]
• [attribute="value"] — selects elements with a specific attribute and an exact value. [S1]
• [attribute~="value"] — selects elements whose attribute value is a space-separated list of words, one of which is the value. [S1]
• [attribute|="value"] — selects elements whose value is exactly the value, or starts with the value followed by a hyphen (-). [S1]

🧩 추출된 패턴 (Extracted patterns)

• Presence targeting — style every element carrying a given attribute (e.g. every link with a target) without touching the HTML. [S1]
• Word-membership match — ~= matches when the value appears as one whole word in a space-separated list, useful for multi-token attributes. [S1]
• Language/prefix match — |= matches a whole value or a value immediately followed by a hyphen, the classic pattern for language codes (en, en-US). [S1]

📖 세부 내용 (Details)

What are attribute selectors? CSS attribute selectors are used to select and style HTML elements with a specific attribute or attribute value, or both. Attribute selectors use square brackets []. [S1]

Tip: The attribute selectors are case-sensitive by default. To perform a case-insensitive match, add an i before the closing bracket. [S1]

Example 1 — [attribute] selector Selects all <a> elements with a target attribute: [S1]

a[target] {
  background-color: yellow;
}

Example 2 — [attribute="value"] selector Selects all <a> elements with a target="_blank" attribute: [S1]

a[target="_blank"] {
  background-color: yellow;
}

Example 3 — [attribute~="value"] selector Selects all elements with a title attribute that contains a space-separated list of words, one of which is "flower." Per the source note, this will match elements with title="flower", title="summer flower", and title="flower new", but not title="my-flower" or title="flowers": [S1]

[title~="flower"] {
  border: 5px solid yellow;
}

Example 4 — [attribute|="value"] selector Selects elements with the specific attribute whose value can be exactly the value, or start with the value followed by a hyphen (-). Note: The value has to be a whole word, either alone, like class="top", or followed by a hyphen (-), like class="top-text": [S1]

[class|="top"] {
  background: yellow;
}

🛠️ 적용 사례 (Applied in summary)

The page's four examples demonstrate applying each selector form to links and titled/classed elements. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

The four basic attribute-selector forms (language: CSS):

a[target]            { background-color: yellow; }   /* has attribute */
a[target="_blank"]   { background-color: yellow; }   /* exact value */
[title~="flower"]    { border: 5px solid yellow; }   /* word in list */
[class|="top"]       { background: yellow; }          /* value or value- */

⚖️ 비교 및 선택 기준 (Comparison & decision criteria)

• [attribute] — use when only the presence of the attribute matters, not its value. [S1]
• [attribute="value"] — use when you need an exact, complete value match. [S1]
• [attribute~="value"] — use when the attribute holds a space-separated word list and you want elements where one whole word equals the value (does not match substrings like flowers or hyphenated my-flower). [S1]
• [attribute|="value"] — use when you want the exact value or that value followed by a hyphen, e.g. matching top and top-text. [S1]

⚖️ 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 Advanced Attribute Selectors, CSS Selectors, CSS Combinators
• 참조 맥락: Referenced whenever styling elements by their attributes — links by target, inputs by type, elements by title/lang/class.

📚 출처 (Sources)

• [S1] W3Schools — CSS Attribute Selectors — https://www.w3schools.com/css/css_attribute_selectors.asp

📝 변경 이력 (Change history)

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