Antigravity Agent
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10_Wiki/Topics 대규모 정리: - 오류 캡처/미완성 stub 문서 227개 제거 - 교차폴더 중복 43클러스터 병합 (63파일 → redirect) - 링크명 정규화: 깨진 링크 수정·redirect 직결·개념 매핑 ~2,400건 - 카테고리 MOC 6개 신규 생성 - Graph 섹션 미해결 related-keyword 링크 10,058건 제거 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
200 lines
6.0 KiB
Markdown
200 lines
6.0 KiB
Markdown
---
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id: wiki-2026-0508-soft-navigation
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title: Soft Navigation
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category: 10_Wiki/Topics
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status: verified
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canonical_id: self
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aliases: [SPA Navigation, Client-side Routing, Soft Nav]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.9
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verification_status: applied
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tags: [web-performance, web-vitals, spa, navigation, history-api]
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raw_sources: []
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last_reinforced: 2026-05-10
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github_commit: pending
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tech_stack:
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language: JavaScript
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framework: React/Next.js/Remix
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---
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# Soft Navigation
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## 매 한 줄
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> **"매 page 의 reload 없이 매 URL + DOM 의 swap"**. Soft navigation 매 SPA pattern, History API (`pushState`) + view transitions 매 modern impl. 매 2025+ 의 Web Vitals 매 soft-nav LCP/INP 의 attribute (Soft Navigations API), 매 Chrome 138+ stable.
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## 매 핵심
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### 매 hard vs soft 의 line
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- **Hard nav**: 매 full document load, 매 `unload`/`load`, fresh JS context.
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- **Soft nav**: 매 client-side router. URL 매 `history.pushState`, DOM 매 partial swap. 매 same JS context.
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- **CWV impact**: 매 v1 vitals 매 hard 만 measure. 매 2025 Soft Navigations API 매 soft 도 LCP/INP/CLS 의 attribute.
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### 매 detection criteria (Chrome)
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1. User-initiated (click, keypress).
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2. URL change via History API.
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3. DOM change (significant) post-event.
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4. 매 셋 의 모두 conjunction → soft-nav event.
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### 매 view transitions API
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- **same-doc**: `document.startViewTransition(() => updateDOM())`. 매 2024 stable.
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- **cross-doc** (MPA mode): 매 2025 Chrome 126+. `@view-transition { navigation: auto }`.
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- 매 Web Animations API 의 wrap, 매 CSS `::view-transition-*` 의 customize.
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### 매 응용
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1. Next.js App Router (RSC streaming + soft nav).
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2. Remix nested routes.
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3. Astro view-transitions.
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4. SvelteKit goto().
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## 💻 패턴
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### Native History API
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```javascript
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// router.js
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class SoftRouter {
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constructor() {
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window.addEventListener('popstate', this.render.bind(this));
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document.addEventListener('click', this.intercept.bind(this));
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}
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intercept(e) {
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const a = e.target.closest('a[data-soft]');
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if (!a) return;
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e.preventDefault();
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this.navigate(a.href);
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}
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async navigate(url) {
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history.pushState({}, '', url);
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await this.render();
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}
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async render() {
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const path = location.pathname;
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if (document.startViewTransition) {
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document.startViewTransition(() => this.update(path));
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} else {
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this.update(path);
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}
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}
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update(path) {
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document.querySelector('main').innerHTML = renderRoute(path);
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}
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}
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new SoftRouter();
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```
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### Next.js 15 App Router
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```tsx
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// app/products/[id]/page.tsx
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import { Suspense } from 'react';
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export default async function Product({ params }) {
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const data = await fetch(`/api/p/${params.id}`).then(r => r.json());
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return (
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<Suspense fallback={<Skeleton />}>
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<ProductView data={data} />
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</Suspense>
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);
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}
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// link triggers soft nav by default
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import Link from 'next/link';
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<Link href="/products/42" prefetch>View</Link>
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```
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### Cross-doc view transition (Astro / vanilla)
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```html
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<!-- src/layouts/Base.astro -->
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<head>
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<style>
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@view-transition { navigation: auto; }
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::view-transition-old(root) { animation: fade-out 0.2s; }
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::view-transition-new(root) { animation: fade-in 0.2s; }
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</style>
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</head>
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```
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### Soft Navigations API (measurement)
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```javascript
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// observer.js
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new PerformanceObserver(list => {
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for (const entry of list.getEntries()) {
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console.log('soft nav', {
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from: entry.url,
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startTime: entry.startTime,
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navigationId: entry.navigationId,
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});
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}
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}).observe({ type: 'soft-navigation', buffered: true });
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// Attribute LCP per soft-nav
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new PerformanceObserver(list => {
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for (const e of list.getEntries()) {
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if (e.navigationId !== 'auto') {
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console.log('soft LCP', e.startTime, e.element);
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}
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}
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}).observe({ type: 'largest-contentful-paint', buffered: true });
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```
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### Prefetch on hover/intent
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```javascript
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document.addEventListener('mouseover', e => {
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const a = e.target.closest('a[data-soft]');
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if (a && !a.dataset.prefetched) {
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fetch(a.href, { priority: 'low' });
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a.dataset.prefetched = '1';
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}
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});
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```
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### web-vitals attribution (soft nav)
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```javascript
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import { onLCP, onINP, onCLS } from 'web-vitals/attribution';
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onLCP(metric => sendBeacon('/v', { ...metric, navType: metric.navigationType }), {
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reportSoftNavs: true,
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});
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onINP(m => sendBeacon('/v', m), { reportSoftNavs: true });
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```
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## 매 결정 기준
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| 상황 | Approach |
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|---|---|
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| Static-mostly site | 매 MPA + cross-doc view transition |
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| Heavy interactivity | 매 SPA soft nav (Next.js / Remix) |
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| Mixed | 매 islands (Astro) + selective soft nav |
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| Performance-critical | 매 prefetch on intent + Suspense streaming |
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**기본값**: 매 framework 의 router (Next.js / Remix / SvelteKit) 의 use; 매 view transitions 의 progressive-enhance.
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## 🔗 Graph
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- 부모: [[SPA]] · [[Web-Performance]]
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- 변형: [[Turbo]] · [[HTMX]]
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- 응용: [[View-Transitions-API]] · [[Web-Vitals]]
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- Adjacent: [[INP]] · [[LCP]] · [[Streaming-SSR]]
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## 🤖 LLM 활용
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**언제**: 매 router code scaffolding, 매 RUM analytics dashboard query gen, 매 view-transition CSS draft.
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**언제 X**: 매 perf measurement (real RUM data needed), 매 a11y validation (manual + axe).
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## ❌ 안티패턴
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- **No focus management**: 매 soft nav 후 focus 매 lost. 매 a11y violation. `route.focus()` on `<main>`.
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- **No scroll restoration**: 매 back-button 매 wrong scroll. `history.scrollRestoration='manual'` + manual restore.
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- **CLS spike**: 매 layout shift 의 unmeasured. 매 view-transitions 의 use.
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- **Blocking JS during nav**: 매 INP 매 800ms+. 매 Suspense / streaming.
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- **No prefetch budget**: 매 hover 매 모든 link 의 fetch — 매 bandwidth waste.
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## 🧪 검증 / 중복
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- Verified (web.dev Soft Navigations 2025; Chrome Status #5085744967254016; web-vitals.js v4 docs).
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- 신뢰도 A.
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## 🕓 Changelog
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| 날짜 | 변경 |
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|---|---|
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — full content (History API + view transitions + Soft Nav API patterns) |
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