The change avoids the exposure of workerStart timestamps for cross origin iframes without explicit opt-in from the cross-origin server.


Reduce the information exposed across origins, and prevent the fingerprintability and information exfiltration that exposing workerStart for cross-origin iframes enables.


Editor's draft

Status in Chromium


In development (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

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Last updated on 2021-04-25