접근성, 성능 및 관측 가능성 — 학습 번들

Outcome：Complete the task with 접근성, 성능 및 관측 가능성 — 학습 번들 (Accessibility, Performance & Observability — Learning Bundle)。 User context：출시 전에 팀은 키보드 흐름과 Web Vitals을 확인해요. 출시 후에는 버전마다 오류율과 지연을 추적해요. Learning bundle to unpack：접근성, 성능 및 관측 가능성 — 학습 번들 (Accessibility, Performance & Observability — Learning Bundle)。 Canonical members：접근성 테스트 (Accessibility Testing)、성능 예산 (Performance Budget)、관찰 가능 신호(Observability Signals) (Observability Signals) Why this comparison helps：번들을 릴리스 체크리스트로 사용하세요. 각 필드마다 고유한 규칙, 증거, 소유자 및 대응 경로를 제공하세요. Do not treat the bundle as one pattern when：실험실 점수나 원시 로그의 양을 사용자 경험으로 취급하지 마십시오. Comparison requirements: Name every member concept on its own. Explain its job and limits. Show every member in the same real situation. Give a visible sign for when to use, combine, or leave out each member. Decision quality: Keep platform and evidence limits clear. Show which members can work together. Point out false matches, unsafe swaps, and cases that need another concept. Acceptance criteria: A reader can explain each member in one sentence and tell them apart in the example. They can defend the chosen member or valid group and open every canonical guide. Evidence and limits (evidence boundary)：이것은 규범적인 표준이 아닙니다. 이름, 한계 및 예상 동작은 출처마다 달라질 수 있습니다. Unknowns to confirm: Target platform, decision setting, limits, and evidence needed to use, combine, or leave out members.