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title

CSS Structural Pseudo-classes

🎯 한 줄 통찰 (One-line insight)

Structural pseudo-classes select elements based on their position in the document tree, letting you target things like the first child or language-tagged elements without adding extra classes. [S1]

🧠 핵심 개념 (Core concepts)

Definition — Structural pseudo-classes select elements based on their position in the document tree. [S1]
:first-child — Matches an element that is the first child of another element. [S1]
:lang() — Used to select elements with a lang attribute set to the specified value. [S1]
Position is relative to the parent — selection depends on where the element sits among its siblings, not on a class or id. [S1]

🧩 추출된 패턴 (Extracted patterns)

First-child targeting — selector:first-child styles only the element that appears first inside its parent. [S1]
Combining position with descent — p em:first-child vs p:first-child em produce different results depending on which element the :first-child is attached to. [S1]
Language-aware styling — :lang(code) applies styles (e.g. quotation marks) only to elements carrying a matching lang value. [S1]

📖 세부 내용 (Details)

Introduction [S1] Structural pseudo-classes select elements based on their position in the document tree.

The :first-child pseudo-class [S1] The :first-child pseudo-class matches a specified element that is the first child of another element.

Style all first child  elements:

p:first-child {
  color: blue;
}

Style the first  element in all  elements:

p em:first-child {
  color: blue;
}

Style all  elements in all first child  elements:

p:first-child em {
  color: blue;
}

The :lang() pseudo-class [S1] The :lang() pseudo-class is used to select elements with a lang attribute with the specified value.

Define quotation marks for <q> elements with lang="no" (Norwegian):

<html>
<head>
<style>
q:lang(no) {
  quotes: "~" "~";
}
</style>
</head>
<body>

<p>Some text <q lang="no">A quote in a paragraph</q> Some text.</p>

</body>
</html>

Other structural pseudo-classes [S1]

Pseudo-class	Description
`:last-child`	Matches the last child of a parent
`:nth-child(n)`	Matches the nth child of a parent
`:nth-last-child(n)`	Matches the nth child from the end
`:only-child`	Matches an element that is the only child
`:first-of-type`	Matches the first element of its type
`:last-of-type`	Matches the last element of its type

For a complete list, the source directs readers to the CSS Pseudo-classes Reference. [S1]

🛠️ 적용 사례 (Applied in summary)

The page's own applied examples are the :first-child rules (blue paragraphs / emphasized text) and the Norwegian :lang(no) quotation-mark demo. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

First-child selector (language: CSS):

p:first-child {
  color: blue;
}

Language selector (language: CSS):

q:lang(no) {
  quotes: "~" "~";
}

⚖️ 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: 0.87
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: CSS Tutorial
관련 개념: CSS Pseudo-elements, CSS Selectors, CSS Combinators
참조 맥락: Referenced when targeting elements by their tree position instead of adding extra classes.

📚 출처 (Sources)

[S1] W3Schools — CSS Structural Pseudo-classes — https://www.w3schools.com/css/css_pseudo_classes_structural.asp

📝 변경 이력 (Change history)

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

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