Service Workers

Service Workers — The programmable network proxy that powers offline, caching, and push for PWAs.

Browser & ecosystem support

• Legend
• Yes
• Partial
• Flag
• No
• Unknown

Browser / Platform	Support	Versions	Confidence	Source	Notes
Chrome (Android)	Yes	40	medium	source	—
Chrome (Desktop)	Yes	40	medium	source	—
Edge (Desktop)	Yes	17	medium	source	—
Safari (iOS)	Yes	11.3	medium	source	1
Safari (macOS)	Yes	11.1	medium	source	—
Firefox (Desktop)	Yes	44	medium	source	—
Samsung Internet	Yes	4.0	medium	source	—

1. Storage may be evicted after prolonged non-use.

Source data: /compatibility/service-worker.json · Global usage: 93 % (StatCounter 2026-05)

Source: spec · MDN · Last verified 2026-06-24 · Confidence: medium (computed from sources)

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