Filesystem & FileWriter API
- UNOFFMethod of reading and writing files to a sandboxed file system.
Chrome
- 4 - 7: Not supported
- 8 - 12: Partial support
- 13 - 122: Supported
- 123: Supported
- 124 - 126: Supported
Edge
- 12 - 18: Not supported
- 79 - 122: Supported
- 123: Supported
Safari
- 3.1 - 17.3: Not supported
- 17.4: Not supported
- TP: Not supported
Firefox
- 2 - 123: Not supported
- 124: Not supported
- 125 - 127: Not supported
Opera
- 9 - 12.1: Not supported
- 15 - 107: Supported
- 108: Supported
IE
- 5.5 - 10: Not supported
- 11: Not supported
Chrome for Android
- 122: Supported
Safari on iOS
- 3.2 - 17.3: Not supported
- 17.4: Not supported
Samsung Internet
- 4: Not supported
- 5 - 22: Supported
- 23: Supported
Opera Mini
- all: Not supported
Opera Mobile
- 10 - 12.1: Not supported
- 80: Supported
UC Browser for Android
- 15.5: Supported
Android Browser
- 2.1 - 4.4.4: Not supported
- 122: Not supported
Firefox for Android
- 123: Not supported
QQ Browser
- 14.9: Not supported
Baidu Browser
- 13.52: Supported
KaiOS Browser
- 2.5: Not supported
- 3: Not supported
The File API: Directories and System specification is no longer being maintained and support may be dropped in future versions.