Support in current browsers

Checked against the current browser versions recorded in MDN browser data 8.1.5.

BrowserMinimumOutcomeReason
Chrome155WorksEvery required mapped BCD feature is available without a recorded qualification.
Edge154WorksEvery required mapped BCD feature is available without a recorded qualification.
Firefox157WorksEvery required mapped BCD feature is available without a recorded qualification.
Safari27UnknownBCD does not provide enough comparable support data for this browser baseline.
Chrome for Android155WorksEvery required mapped BCD feature is available without a recorded qualification.
Firefox for Android157WorksEvery required mapped BCD feature is available without a recorded qualification.
Safari on iOS27Not supportedAt least one required mapped feature is not available at this browser baseline.
Android WebView155WorksEvery required mapped BCD feature is available without a recorded qualification.
Samsung Internet30.0WorksEvery required mapped BCD feature is available without a recorded qualification.
The release trace

How support changed

Each segment groups recorded releases with the same result. Gaps between recorded versions are not filled in. This is support at each release, rather than the planner’s check of every release above a minimum.

Chrome

http.headers.Origin-Agent-Cluster
  1. 1 – 8988 recorded releases
    Not supported
  2. 90 – 15566 recorded releases
    Works

Edge

http.headers.Origin-Agent-Cluster
  1. 12 – 8917 recorded releases
    Not supported
  2. 90 – 15465 recorded releases
    Works

Firefox

http.headers.Origin-Agent-Cluster
  1. 1 – 137140 recorded releases
    Not supported
  2. 138 – 15720 recorded releases
    Works

Safari

http.headers.Origin-Agent-Cluster
  1. 1 – 2761 recorded releases
    Unknown
    • Support begins at an imprecise version: preview

Chrome for Android

http.headers.Origin-Agent-Cluster
  1. 18 – 8965 recorded releases
    Not supported
  2. 90 – 15566 recorded releases
    Works

Firefox for Android

http.headers.Origin-Agent-Cluster
  1. 4 – 137121 recorded releases
    Not supported
  2. 138 – 15720 recorded releases
    Works

Safari on iOS

http.headers.Origin-Agent-Cluster
  1. 1 – 2758 recorded releases
    Not supported

Android WebView

http.headers.Origin-Agent-Cluster
  1. 1 – 8960 recorded releases
    Not supported
  2. 90 – 15566 recorded releases
    Works

Samsung Internet

http.headers.Origin-Agent-Cluster
  1. 1.0 – 14.233 recorded releases
    Not supported
  2. 15.0 – 30.019 recorded releases
    Works

BCD 8.1.5 · catalogue 2.3.0. Source corrections can change this trace without a new browser release.

What this feature can and cannot do

Helps protect against

  • Unnecessary same-site process sharing
  • Origin isolation ambiguity

Does not guarantee

  • Complete process isolation
  • Application authorisation
  • Browser defects

What you need before using it

  • Consistent delivery across an origin

Fallback to keep in place

Use separate origins for security boundaries and avoid relying on process placement.