This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The Connection.bandwidth read-only property is a double representing the estimated download bandwidth (in megabytes per second) of the current connection.


speed = connection.bandwidth

On return, speed is the estimated download bandwidth in megabytes per second. There are two special values: 0 is returned if the user is currently offline, and infinity is returned if the bandwidth is unknown.


Specification Status Comment
Network Information API
The definition of 'Connection.bandwidth' in that specification.
Editor's Draft Initial specification.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support 12.0 moz No support No support No support
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support 12.0 moz No support No support No support

Gecko notes

  • The Network API can be disabled using the preference.
  • As of Gecko 12.0, the Network API is implemented for Android systems only. Support for Linux (bug 712442) and Windows (bug 721306) systems is in progress.

See also

Document Tags and Contributors

Contributors to this page: fscholz, teoli, tregagnon, Jeremie, Sheppy
Last updated by: fscholz,