--- id: javascript-html-dom title: "JavaScript HTML DOM" category: "Frontend" status: "draft" verification_status: "conceptual" canonical_id: "" aliases: ["HTML DOM", "Document Object Model", "DOM tree", "DOM nodes", "HTML Document Object Model"] 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: ["javascript", "js", "web", "frontend", "w3schools", "dom"] raw_sources: ["https://www.w3schools.com/js/js_htmldom.asp"] applied_in: [] github_commit: "" --- # [[JavaScript HTML DOM]] ## 🎯 한 줄 통찰 (One-line insight) The HTML DOM is an object model that represents an HTML page as a tree of nodes, giving JavaScript a standardized way to access and change every element on the page. [S1] ## 🧠 핵심 개념 (Core concepts) - **The HTML DOM is an Object Model for HTML Documents** — it represents an HTML page as a tree of nodes. [S1] - **The browser builds the tree on load** — when a webpage loads, the browser creates a tree-like representation of the document made of nodes: Document, Element nodes (such as ``, ``, ``), Attribute nodes, and Text nodes. [S1] - **Three roles in one access expression** — `id="demo"` is an HTML property, `getElementById()` is a DOM method, and `innerHTML` is a DOM property. [S1] - **The DOM is a W3C Standard** — defined by the World Wide Web Consortium in three parts: Core DOM, XML DOM, and HTML DOM. [S1] ## 🧩 추출된 패턴 (Extracted patterns) - **Access then modify** — get a node reference with a DOM method, then read or write a DOM property on it. [S1] - **Tree traversal mindset** — because the page is a tree of nodes, navigation and manipulation are expressed in terms of elements, attributes, and text nodes. [S1] ## 📖 세부 내용 (Details) **The HTML DOM** [S1] The HTML DOM (HTML Document Object Model) is an Object Model for HTML Documents. It represents an HTML page as a tree of nodes. [S1] **The DOM Tree** [S1] When a webpage loads, the browser creates a tree-like representation of the document. This tree is made of nodes for the different parts of the document: the Document node, Element nodes (for example ``, ``, ``), Attribute nodes, and Text nodes. [S1] **Accessing HTML Elements** [S1] HTML elements are accessed through the document. The following example accesses a paragraph element by its id and changes its content: [S1] ```javascript // Access a paragraph Element const myPara = document.getElementById("demo"); // Change the content of the Element myPara.innerHTML = "Hello World!"; ``` In this example, `id="demo"` is an HTML property, `getElementById()` is a DOM method, and `innerHTML` is a DOM property. [S1] **What You Will Learn** [S1] The tutorial covers how to: change the content of HTML elements, change the style (CSS) of HTML elements, add and delete HTML elements, and react to HTML events. [S1] **The World Wide Web Consortium** [S1] The DOM is a W3C Standard (World Wide Web Consortium). The W3C DOM standard is separated into three parts: Core DOM, XML DOM, and HTML DOM. [S1] ## 🛠️ 적용 사례 (Applied in summary) The page's own snippet — selecting `#demo` with `getElementById()` and assigning to `innerHTML` — is the canonical applied example. No external project/commit applications found in the source. ## 💻 코드 패턴 (Code patterns) Access an element by id and change its content (language: JavaScript): ```javascript const myPara = document.getElementById("demo"); myPara.innerHTML = "Hello World!"; ``` ## ⚖️ 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:** [[JavaScript Tutorial]] - **관련 개념:** [[JavaScript DOM Methods]], [[JavaScript DOM Elements]], [[JavaScript DOM Changing HTML]], [[JavaScript Introduction]] - **참조 맥락:** The foundational model referenced by every DOM manipulation, styling, and event topic. ## 📚 출처 (Sources) - [S1] W3Schools — JavaScript HTML DOM — https://www.w3schools.com/js/js_htmldom.asp ## 📝 변경 이력 (Change history) - 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript HTML DOM" page (Astra wiki-curation, P-Reinforce v3.1 format).