The Timing-Allow-Origin response header specifies origins that are allowed to see values of attributes retrieved via features of the Resource Timing API, which would otherwise be reported as zero due to cross-origin restrictions.


Timing-Allow-Origin: *
Timing-Allow-Origin: <origin>[, <origin>]*


The server may specify "*" as a wildcard, thereby allowing any origin to see timing resources.
Specifies a URI that may see the timing resources. You can specify multiple origins, separated by commas.


To allow any resource to see timing resources:

Timing-Allow-Origin: *

To allow https://developer.mozilla.org to see timing resources, you can specify:

Timing-Allow-Origin: https://developer.mozilla.org


Specification Status Comment
Resource Timing Level 3
The definition of 'Timing-Allow-Origin' in that specification.
Editor's Draft Initial definition.

Browser compatibility

Feature Chrome Edge Firefox Internet Explorer Opera Safari
Basic support Yes ? Yes ? Yes Yes
Feature Android webview Chrome for Android Edge mobile Firefox for Android IE mobile Opera Android iOS Safari
Basic support Yes Yes ? Yes ? Yes Yes

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.