---
id: wiki-2026-0508-first-input-delay-fid
title: First Input Delay (FID)
category: 10_Wiki/Topics
status: duplicate
canonical_id: wiki-core-web-vitals
duplicate_of: "[[Core-Web-Vitals]]"
aliases: [FID, INP, interaction to next paint]
source_trust_level: A
confidence_score: 0.9
verification_status: redirected
tags: [duplicate, web-vitals, fid, inp, performance]
last_reinforced: 2026-05-10
github_commit: pending
---

# First Input Delay (FID)

> **이 문서는 [[Core-Web-Vitals]] 의 specialization 입니다.** Canonical 문서로 redirect.

## 핵심 요약
- 매 first user input → 매 browser response.
- **DEPRECATED 2024-03**: 매 FID → 매 **INP** (Interaction to Next Paint).
- 매 INP target: < 200ms good, < 500ms needs improvement.
- 매 측정: PerformanceObserver event timing.

```js
import { onINP } from 'web-vitals';
onINP(({ value }) => analytics.track('INP', { value }));
```

## 🔗 Graph
- 부모: [[Core-Web-Vitals]] (canonical)
- 후속: [[Interaction-to-Next-Paint-INP]]

## 🕓 변경 이력
| 날짜 | 변경 |
|---|---|
| 2026-05-08 | Phase 1 |
| 2026-05-10 | 중복 처리 — canonical 문서로 redirect (note: 2024-03 INP 의 replace) |