# Web Experiment: Cookie consent management — Amplitude Changelog

The Web Experiment script now supports cookie consent gating. Customers can defer all device storage and third-party requests until a visitor consents — while still running experiments flicker-free while consent is pending.

Source: https://amplitude.com/en-us/releases/web-experiment-cookie-consent-management

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[Changelog](/releases)/Web Experiment: Cookie consent management

ExperimentAug 25, 2026

# Web Experiment: Cookie consent management

The Web Experiment script now supports cookie consent gating. Customers can defer all device storage and third-party requests until a visitor consents — while still running experiments flicker-free while consent is pending.

## What it is

**Description:** The Web Experiment script now supports cookie consent gating. Customers can defer all device storage and third-party requests until a visitor consents — while still running experiments flicker-free while consent is pending.

**Why:** EU customers (and others with CMP banners) need to run web experiments without writing cookies, localStorage, or sessionStorage — or firing impressions to third-party origins — before consent. Previously the only safe option was blocking the script entirely, which meant no experiments and visible flicker when consent arrived. This gives a compliant default that still delivers the test experience.

**What’s new:** • `consentOptions` on `window.experimentConfig` — opt in with `consentRequired: true` • `window.webExperiment.setConsentStatus()` — wire your CMP callback (`'granted'`/`'denied'`) • Script behavior ◦ While pending: experiments evaluate and variants apply with no flicker; cookie/storage writes, impression events, and the RTBT relay iframe stay in memory only ◦ On grant: buffered identity, storage, and impressions flush to the device; relay loads ◦ On deny: client doesn’t start (or erases prior-session data on revocation); nothing persists from the pending buffer

**Available in EUDC:** Yes

**When:** Now!

**Docs:** [amplitude.com/docs/web-experiment/cookies-and-consent-management](https://amplitude.com/docs/web-experiment/cookies-and-consent-management)

**Implementation snippet:**

```html
<script>
  window.experimentConfig = {
    consentOptions: { consentRequired: true },
  };
</script>
<!-- Web Experiment script tag -->
// CMP callback
window.webExperiment?.setConsentStatus('granted'); // or 'denied'
```

**Notes:** • This gates Web Experiment only. Analytics consent is separate — pair with [Browser SDK cookies & consent](https://amplitude.com/docs/sdks/analytics/browser/cookies-and-consent-management) if they use both. • Works with the anti-flicker snippet and cross-subdomain identity/RTBT.

Release details

- Release ID

  web-experiment-cookie-consent-management

- Shipped

  Aug 25, 2026

- Area

  Experiment

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