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HTML5 Worker Test
Which APIs are supported in Web Workers and Service Workers? This chart shows the breakdown for each browser, based on automated testing.
Note that the goal is not for browsers to reach 100% on all tests. Some APIs are intentionally not exposed to workers. This site is for informational purposes only.
Web Workers
Chrome
81 more
|
Firefox
76 more
|
IE
11 more
|
Edge
17 more
|
Safari
13 more
|
iOS Safari
13 more
|
Android Chrome
67 more
|
|
|---|---|---|---|---|---|---|---|
| Network | |||||||
| EventSource (SSE) | ✓ | ✓ | ✗ | ✗ | ✓ | ✓ | ✓ |
| fetch | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| WebSockets | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| XMLHttpRequest | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Storage | |||||||
| Cache | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| IndexedDB | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| LocalStorage | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| SessionStorage | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| WebSQL | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Binary | |||||||
| atob | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Atomics | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Blob | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| btoa | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| createImageBitmap | ✓ | ✓ | ✗ | ✗ | ✗ | ✗ | ✓ |
| FileReader | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| FileReaderSync | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| ImageData | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| SharedArrayBuffer | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Timers | |||||||
| clearImmediate | ✗ | ✗ | ✓ | ✓ | ✗ | ✗ | ✗ |
| clearInterval | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| clearTimeout | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Promise | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| requestIdleCallback | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| setImmediate | ✗ | ✗ | ✓ | ✓ | ✗ | ✗ | ✗ |
| setInterval | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| setTimeout | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Location | |||||||
| location.hash | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| location.host | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| location.hostname | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| location.origin | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| location.pathname | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| location.port | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| location.protocol | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| location.search | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Navigator | |||||||
| navigator.onLine | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| navigator.product | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| navigator.sendBeacon | ✗ | ✗ | ✗ | ✓ | ✗ | ✗ | ✗ |
| navigator.userAgent | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Miscellaneous | |||||||
| BroadcastChannel | ✓ | ✓ | ✗ | ✗ | ✗ | ✗ | ✓ |
| Channel Messaging | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| console | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| CustomEvent | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| DOMCursor | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| DOMRequest | ✗ | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ |
| FormData | ✓ | ✓ | ✗ | ✗ | ✗ | ✗ | ✓ |
| importScripts | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Intl | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Notifications | ✓ | ✓ | ✗ | ✓ | ✗ | ✗ | ✓ |
| OffscreenCanvas | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| performance | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| TextEncoder/TextDecoder | ✓ | ✓ | ✗ | ✗ | ✓ | ✓ | ✓ |
| URL | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| WebCrypto | ✓ | ✓ | ✗ | ✗ | ✓ | ✓ | ✓ |
| Worker | ✓ | ✓ | ✓ | ✓ | ✗ | ✗ | ✗ |
Service Workers
|
Chrome
81 more
|
Firefox
76 more
|
IE
11 more
|
Edge
17 more
|
Safari
13 more
|
iOS Safari
13 more
|
Android Chrome
67 more
|
|
|---|---|---|---|---|---|---|---|
| Network | |||||||
| EventSource (SSE) | ✓ | ✗ | ✗ | ✗ | ✓ | ✓ | ✓ |
| fetch | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| WebSockets | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| XMLHttpRequest | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Storage | |||||||
| Cache | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| IndexedDB | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| LocalStorage | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| SessionStorage | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| WebSQL | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Binary | |||||||
| atob | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| Atomics | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Blob | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| btoa | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| createImageBitmap | ✓ | ✓ | ✗ | ✗ | ✓ | ✓ | ✓ |
| FileReader | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| FileReaderSync | ✗ | ✗ | ✗ | ✓ | ✓ | ✓ | ✗ |
| ImageData | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| SharedArrayBuffer | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Timers | |||||||
| clearImmediate | ✗ | ✗ | ✗ | ✓ | ✗ | ✗ | ✗ |
| clearInterval | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| clearTimeout | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| Promise | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| requestIdleCallback | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| setImmediate | ✗ | ✗ | ✗ | ✓ | ✗ | ✗ | ✗ |
| setInterval | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| setTimeout | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| Location | |||||||
| location.hash | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| location.host | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| location.hostname | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| location.origin | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| location.pathname | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| location.port | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| location.protocol | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| location.search | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| Navigator | |||||||
| navigator.onLine | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| navigator.product | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| navigator.sendBeacon | ✗ | ✗ | ✗ | ✓ | ✗ | ✗ | ✗ |
| navigator.userAgent | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| Miscellaneous | |||||||
| BroadcastChannel | ✓ | ✓ | ✗ | ✗ | ✗ | ✗ | ✓ |
| Channel Messaging | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| console | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| CustomEvent | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| DOMCursor | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| DOMRequest | ✗ | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ |
| FormData | ✓ | ✓ | ✗ | ✗ | ✗ | ✗ | ✓ |
| importScripts | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| Intl | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| Notifications | ✓ | ✓ | ✗ | ✓ | ✗ | ✗ | ✓ |
| OffscreenCanvas | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| performance | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| TextEncoder/TextDecoder | ✓ | ✓ | ✗ | ✗ | ✓ | ✓ | ✓ |
| URL | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| WebCrypto | ✓ | ✓ | ✗ | ✗ | ✓ | ✓ | ✓ |
| Worker | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |