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Timing-Allow-Origin header - HTTP | MDN

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The HTTP 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. Any origin may 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: To allow https://developer.mozilla.org to see timing resources, you can specify: This page was last modified on ⁨Jul 4, 2025⁩ by MDN contributors. Your blueprint for a better internet. Visit Mozilla Corporation’s not-for-profit parent, the Mozilla Foundation. Portions of this content are ©1998–⁨2025⁩ by individual mozilla.org contributors. Content available under a Creative Commons license.

Timing-Allow-Origin header - HTTP | MDN Skip to main content Skip to search Timing-Allow-Origin header Baseline Widely available This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020. Learn more See full compatibility The HTTP 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. Header type Response header Syntax http Timing-Allow-Origin:

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