diff --git a/packages/browser-core/src/domain/error/error.types.ts b/packages/browser-core/src/domain/error/error.types.ts
index 90f036b934..6b68c01515 100644
--- a/packages/browser-core/src/domain/error/error.types.ts
+++ b/packages/browser-core/src/domain/error/error.types.ts
@@ -23,12 +23,14 @@ export interface RawErrorCause {
 
 export interface Csp {
   disposition: 'enforce' | 'report'
+  featureId?: string
 }
 
 export interface RawError {
   startClocks: ClocksState
   message: string
   type?: string
+  featureId?: string
   stack?: string
   source: ErrorSource
   originalError?: unknown
diff --git a/packages/browser-core/src/domain/report/browser.types.ts b/packages/browser-core/src/domain/report/browser.types.ts
index 1434b91b9b..d1637dc429 100644
--- a/packages/browser-core/src/domain/report/browser.types.ts
+++ b/packages/browser-core/src/domain/report/browser.types.ts
@@ -1,9 +1,9 @@
-export type ReportType = DeprecationReport['type'] | InterventionReport['type']
+export type ReportType = DeprecationReport['type'] | InterventionReport['type'] | DocumentPolicyViolationReport['type']
 
 interface Report {
   type: ReportType
   url: string
-  body: DeprecationReportBody | InterventionReportBody
+  body: DeprecationReportBody | InterventionReportBody | DocumentPolicyViolationReportBody
   toJSON(): any
 }
 
@@ -36,3 +36,16 @@ export interface InterventionReportBody extends ReportBody {
   columnNumber: number | null
   sourceFile: string | null
 }
+
+export interface DocumentPolicyViolationReport extends Report {
+  type: 'document-policy-violation'
+  body: DocumentPolicyViolationReportBody
+}
+export interface DocumentPolicyViolationReportBody extends ReportBody {
+  featureId: string
+  message: string
+  disposition: 'enforce' | 'report'
+  lineNumber: null
+  columnNumber: null
+  sourceFile: string | null
+}
diff --git a/packages/browser-core/src/domain/report/reportObservable.spec.ts b/packages/browser-core/src/domain/report/reportObservable.spec.ts
index 95da8f37d0..07f7b2f0a3 100644
--- a/packages/browser-core/src/domain/report/reportObservable.spec.ts
+++ b/packages/browser-core/src/domain/report/reportObservable.spec.ts
@@ -1,5 +1,10 @@
 import type { MockCspEventListener, MockReportingObserver } from '../../../test'
-import { mockReportingObserver, mockCspEventListener, FAKE_CSP_VIOLATION_EVENT } from '../../../test'
+import {
+  mockReportingObserver,
+  mockCspEventListener,
+  FAKE_CSP_VIOLATION_EVENT,
+  FAKE_DOCUMENT_POLICY_VIOLATION_REPORT,
+} from '../../../test'
 import type { Subscription } from '../../tools/observable'
 import { ErrorHandling, ErrorSource } from '../error/error.types'
 import type { RawReportError } from './reportObservable'
@@ -74,4 +79,43 @@ describe('report observable', () => {
 
     expect(notifyReport).not.toHaveBeenCalled()
   })
+
+  it(`should notify ${RawReportType.documentPolicyViolation} reports`, () => {
+    consoleSubscription = initReportObservable([RawReportType.documentPolicyViolation]).subscribe(notifyReport)
+    reportingObserver.raiseReport('document-policy-violation')
+
+    expect(notifyReport).toHaveBeenCalledOnceWith(
+      jasmine.objectContaining({
+        message: 'document-policy-violation: Document policy violation: resource compression is required.',
+        type: 'document-policy-violation',
+        featureId: 'network-efficiency-guardrails',
+        csp: { disposition: 'report' },
+      })
+    )
+  })
+
+  it(`should compute stack for ${RawReportType.documentPolicyViolation}`, () => {
+    consoleSubscription = initReportObservable([RawReportType.documentPolicyViolation]).subscribe(notifyReport)
+    reportingObserver.raiseReport('document-policy-violation')
+
+    const [report] = notifyReport.calls.mostRecent().args
+
+    expect(report.stack)
+      .toEqual(`network-efficiency-guardrails: Document policy violation: resource compression is required.
+  at <anonymous> @ https://foo.bar/large-uncompressed.js`)
+  })
+
+  it(`should notify ${RawReportType.documentPolicyViolation} reports regardless of featureId`, () => {
+    consoleSubscription = initReportObservable([RawReportType.documentPolicyViolation]).subscribe(notifyReport)
+    reportingObserver.raiseReport('document-policy-violation', {
+      body: { ...FAKE_DOCUMENT_POLICY_VIOLATION_REPORT.body, featureId: 'some-other-policy' },
+    })
+
+    expect(notifyReport).toHaveBeenCalledOnceWith(
+      jasmine.objectContaining({
+        type: 'document-policy-violation',
+        featureId: 'some-other-policy',
+      })
+    )
+  })
 })
diff --git a/packages/browser-core/src/domain/report/reportObservable.ts b/packages/browser-core/src/domain/report/reportObservable.ts
index 21a36fd735..a31d64c4c0 100644
--- a/packages/browser-core/src/domain/report/reportObservable.ts
+++ b/packages/browser-core/src/domain/report/reportObservable.ts
@@ -6,18 +6,19 @@ import { addEventListener, DOM_EVENT, isEventSupported } from '../../browser/add
 import { safeTruncate } from '../../tools/utils/stringUtils'
 import type { RawError } from '../error/error.types'
 import { ErrorHandling, ErrorSource } from '../error/error.types'
-import type { ReportType, InterventionReport, DeprecationReport } from './browser.types'
+import type { ReportType, InterventionReport, DeprecationReport, DocumentPolicyViolationReport } from './browser.types'
 
 export const RawReportType = {
   intervention: 'intervention',
   deprecation: 'deprecation',
   cspViolation: 'csp_violation',
+  documentPolicyViolation: 'document-policy-violation',
 } as const
 
 export type RawReportType = (typeof RawReportType)[keyof typeof RawReportType]
 
 export type RawReportError = RawError & {
-  originalError: SecurityPolicyViolationEvent | DeprecationReport | InterventionReport
+  originalError: SecurityPolicyViolationEvent | DeprecationReport | InterventionReport | DocumentPolicyViolationReport
 }
 
 export function initReportObservable(apis: RawReportType[]) {
@@ -27,7 +28,7 @@ export function initReportObservable(apis: RawReportType[]) {
     observables.push(createCspViolationReportObservable())
   }
 
-  const reportTypes = apis.filter((api: RawReportType): api is ReportType => api !== RawReportType.cspViolation)
+  const reportTypes = apis.filter((api): api is ReportType => api !== RawReportType.cspViolation)
   if (reportTypes.length) {
     observables.push(createReportObservable(reportTypes))
   }
@@ -41,8 +42,9 @@ function createReportObservable(reportTypes: ReportType[]) {
       return
     }
 
-    const handleReports = monitor((reports: Array<DeprecationReport | InterventionReport>, _: ReportingObserver) =>
-      reports.forEach((report) => observable.notify(buildRawReportErrorFromReport(report)))
+    const handleReports = monitor(
+      (reports: Array<DeprecationReport | InterventionReport | DocumentPolicyViolationReport>, _: ReportingObserver) =>
+        reports.forEach((report) => observable.notify(buildRawReportErrorFromReport(report)))
     ) as ReportingObserverCallback
 
     const observer = new window.ReportingObserver(handleReports, {
@@ -72,9 +74,22 @@ function createCspViolationReportObservable() {
   })
 }
 
-function buildRawReportErrorFromReport(report: DeprecationReport | InterventionReport): RawReportError {
-  const { type, body } = report
+function buildRawReportErrorFromReport(
+  report: DeprecationReport | InterventionReport | DocumentPolicyViolationReport
+): RawReportError {
+  if (report.type === 'document-policy-violation') {
+    const { featureId, message, disposition, sourceFile } = report.body
+    return buildRawReportError({
+      type: report.type,
+      featureId,
+      message: `${report.type}: ${message}`,
+      originalError: report,
+      csp: { disposition },
+      stack: buildStack(featureId, message, sourceFile, null, null),
+    })
+  }
 
+  const { type, body } = report
   return buildRawReportError({
     type: body.id,
     message: `${type}: ${body.message}`,
diff --git a/packages/browser-core/test/emulate/mockReportingObserver.ts b/packages/browser-core/test/emulate/mockReportingObserver.ts
index a278ece395..95699933ed 100644
--- a/packages/browser-core/test/emulate/mockReportingObserver.ts
+++ b/packages/browser-core/test/emulate/mockReportingObserver.ts
@@ -1,4 +1,8 @@
-import type { InterventionReport, ReportType } from '../../src/domain/report/browser.types'
+import type {
+  DocumentPolicyViolationReport,
+  InterventionReport,
+  ReportType,
+} from '../../src/domain/report/browser.types'
 import { noop } from '../../src/tools/utils/functionUtils'
 import { registerCleanupTask } from '../registerCleanupTask'
 import { createNewEvent } from './createNewEvent'
@@ -39,9 +43,13 @@ export function mockReportingObserver() {
   })
 
   return {
-    raiseReport(type: ReportType) {
+    raiseReport(type: ReportType, overrides?: Partial<DocumentPolicyViolationReport>) {
       if (callbacks[type]) {
-        callbacks[type].forEach((callback) => callback([{ ...FAKE_REPORT, type }], reportingObserver))
+        const report =
+          type === 'document-policy-violation'
+            ? { ...FAKE_DOCUMENT_POLICY_VIOLATION_REPORT, ...overrides }
+            : { ...FAKE_REPORT, type }
+        callbacks[type].forEach((callback) => callback([report], reportingObserver))
       }
     },
   }
@@ -85,6 +93,21 @@ export const FAKE_CSP_VIOLATION_EVENT = createNewEvent('securitypolicyviolation'
   violatedDirective: 'worker-src',
 })
 
+export const FAKE_DOCUMENT_POLICY_VIOLATION_REPORT: DocumentPolicyViolationReport = {
+  type: 'document-policy-violation',
+  url: 'http://foo.bar',
+  body: {
+    featureId: 'network-efficiency-guardrails',
+    message: 'Document policy violation: resource compression is required.',
+    disposition: 'report',
+    lineNumber: null,
+    columnNumber: null,
+    sourceFile: 'https://foo.bar/large-uncompressed.js',
+    toJSON: noop,
+  },
+  toJSON: noop,
+}
+
 export const FAKE_REPORT: InterventionReport = {
   type: 'intervention',
   url: 'http://foo.bar',
diff --git a/packages/browser-logs/src/domain/createErrorFieldFromRawError.spec.ts b/packages/browser-logs/src/domain/createErrorFieldFromRawError.spec.ts
index 1ce6d3e5d3..802b19bf04 100644
--- a/packages/browser-logs/src/domain/createErrorFieldFromRawError.spec.ts
+++ b/packages/browser-logs/src/domain/createErrorFieldFromRawError.spec.ts
@@ -14,6 +14,7 @@ describe('createErrorFieldFromRawError', () => {
     componentStack: 'at Flex',
     originalError: new Error('baz'),
     type: 'qux',
+    featureId: 'quux-feature',
     message: 'quux',
     stack: 'quuz',
     causes: [
@@ -43,6 +44,7 @@ describe('createErrorFieldFromRawError', () => {
     expect(createErrorFieldFromRawError(exhaustiveRawError)).toEqual({
       message: undefined,
       kind: 'qux',
+      feature_id: 'quux-feature',
       stack: 'quuz',
       causes: [
         {
diff --git a/packages/browser-logs/src/domain/createErrorFieldFromRawError.ts b/packages/browser-logs/src/domain/createErrorFieldFromRawError.ts
index a098151f95..cc0d80b053 100644
--- a/packages/browser-logs/src/domain/createErrorFieldFromRawError.ts
+++ b/packages/browser-logs/src/domain/createErrorFieldFromRawError.ts
@@ -14,6 +14,7 @@ export function createErrorFieldFromRawError(
   return {
     stack: rawError.stack,
     kind: rawError.type,
+    feature_id: rawError.featureId,
     message: includeMessage ? rawError.message : undefined,
     causes: rawError.causes,
     fingerprint: rawError.fingerprint,
diff --git a/packages/browser-logs/src/rawLogsEvent.types.ts b/packages/browser-logs/src/rawLogsEvent.types.ts
index 8ae09d843e..0bd0dc3b20 100644
--- a/packages/browser-logs/src/rawLogsEvent.types.ts
+++ b/packages/browser-logs/src/rawLogsEvent.types.ts
@@ -13,6 +13,7 @@ export type RawLogsEvent =
 interface Error {
   message?: string
   kind?: string
+  feature_id?: string
   stack?: string
   fingerprint?: string
   causes?: RawErrorCause[]
diff --git a/packages/browser-rum-core/src/domain/error/errorCollection.ts b/packages/browser-rum-core/src/domain/error/errorCollection.ts
index e4bd4c972a..e02498445c 100644
--- a/packages/browser-rum-core/src/domain/error/errorCollection.ts
+++ b/packages/browser-rum-core/src/domain/error/errorCollection.ts
@@ -70,20 +70,24 @@ export function doStartErrorCollection(lifeCycle: LifeCycle) {
 function processError(error: RawError): RawRumEventCollectedData<RawRumErrorEvent> {
   const rawRumEvent: RawRumErrorEvent = {
     date: error.startClocks.timeStamp,
-    error: {
-      id: generateUUID(),
-      message: error.message,
-      source: error.source,
-      stack: error.stack,
-      handling_stack: error.handlingStack,
-      component_stack: error.componentStack,
-      type: error.type,
-      handling: error.handling,
-      causes: error.causes,
-      source_type: 'browser',
-      fingerprint: error.fingerprint,
-      csp: error.csp,
-    },
+    error: combine(
+      {
+        id: generateUUID(),
+        message: error.message,
+        source: error.source,
+        stack: error.stack,
+        handling_stack: error.handlingStack,
+        component_stack: error.componentStack,
+        type: error.type,
+        handling: error.handling,
+        causes: error.causes,
+        source_type: 'browser' as const,
+        fingerprint: error.fingerprint,
+        csp: error.csp,
+      },
+      // TODO: add feature_id to the rum-events-format schema then remove this combine()
+      error.featureId !== undefined ? { feature_id: error.featureId } : {}
+    ),
     type: RumEventType.ERROR,
     context: error.context,
   }
diff --git a/packages/browser-rum-core/src/domain/error/trackReportError.ts b/packages/browser-rum-core/src/domain/error/trackReportError.ts
index afa136e7c1..cf76b23f2d 100644
--- a/packages/browser-rum-core/src/domain/error/trackReportError.ts
+++ b/packages/browser-rum-core/src/domain/error/trackReportError.ts
@@ -1,9 +1,11 @@
 import type { Observable, RawError } from '@datadog/browser-core'
 import { initReportObservable, RawReportType } from '@datadog/browser-core'
 export function trackReportError(errorObservable: Observable<RawError>) {
-  const subscription = initReportObservable([RawReportType.cspViolation, RawReportType.intervention]).subscribe(
-    (rawError) => errorObservable.notify(rawError)
-  )
+  const subscription = initReportObservable([
+    RawReportType.cspViolation,
+    RawReportType.intervention,
+    RawReportType.documentPolicyViolation,
+  ]).subscribe((rawError) => errorObservable.notify(rawError))
 
   return {
     stop: () => {
diff --git a/test/e2e/lib/framework/serverApps/mock.ts b/test/e2e/lib/framework/serverApps/mock.ts
index 148f813600..63bacea6ef 100644
--- a/test/e2e/lib/framework/serverApps/mock.ts
+++ b/test/e2e/lib/framework/serverApps/mock.ts
@@ -181,10 +181,23 @@ export function createMockServerApp(servers: Servers, setup: string, setupOption
     if (req.query['js-profiling'] === 'true') {
       res.header('Document-Policy', 'js-profiling')
     }
+    if (req.query['network-efficiency-guardrails'] === 'true') {
+      res.header('Document-Policy', 'network-efficiency-guardrails')
+    }
     res.send(setup)
     res.end()
   })
 
+  // Serves an uncompressed JavaScript file large enough to trigger a network-efficiency-guardrails
+  // policy violation (text resources must be HTTP-compressed).
+  app.get('/uncompressed-script.js', (_req, res) => {
+    res.removeHeader('Content-Encoding')
+    res.header('Content-Type', 'application/javascript')
+    // Explicitly disable compression for this endpoint so the browser detects a violation
+    res.header('Cache-Control', 'no-store')
+    res.send(`// uncompressed script\n${'// padding\n'.repeat(500)}`)
+  })
+
   app.get('/no-blob-worker-csp', (_req, res) => {
     res.header(
       'Content-Security-Policy',
diff --git a/test/e2e/playwright.config.ts b/test/e2e/playwright.config.ts
index 9ffd74279e..294d2e81ad 100644
--- a/test/e2e/playwright.config.ts
+++ b/test/e2e/playwright.config.ts
@@ -168,10 +168,16 @@ function getProjects() {
 }
 
 function project(name: string, device: string) {
+  const isChromium = name === 'chromium'
   return {
     name,
     metadata: { sessionName: device, name } satisfies BrowserConfiguration,
-    use: devices[device],
+    use: {
+      ...devices[device],
+      // Required for experimental APIs (e.g. Network Efficiency Guardrails).
+      // Only passed to current Chromium — pinned browsers use pinnedProject() and may not support it.
+      ...(isChromium ? { launchOptions: { args: ['--enable-experimental-web-platform-features'] } } : {}),
+    },
   }
 }
 
diff --git a/test/e2e/scenario/networkEfficiencyGuardrails.scenario.ts b/test/e2e/scenario/networkEfficiencyGuardrails.scenario.ts
new file mode 100644
index 0000000000..db9efb4250
--- /dev/null
+++ b/test/e2e/scenario/networkEfficiencyGuardrails.scenario.ts
@@ -0,0 +1,98 @@
+import { test, expect } from '@playwright/test'
+import { createTest } from '../lib/framework'
+import type { BrowserConfiguration } from '../../browsers.conf'
+
+// Network Efficiency Guardrails is a Document Policy feature currently only available in Edge 146+
+// and in Chromium behind the "Experimental Web Platform features" flag.
+// We run these tests only on Chromium.
+
+test.describe('network efficiency guardrails', () => {
+  test.beforeEach(({ browserName }) => {
+    const { version } = test.info().project.metadata as BrowserConfiguration
+    // Network Efficiency Guardrails requires Chromium 146+. Pinned projects set an explicit
+    // version; current (unversioned) Chromium is always new enough.
+    test.skip(
+      browserName !== 'chromium' || (version !== undefined && Number(version) < 146),
+      'Network Efficiency Guardrails requires Chromium 146+'
+    )
+  })
+
+  test.describe('RUM', () => {
+    createTest('should collect network-efficiency-guardrails violations as RUM errors')
+      .withRum()
+      .withBasePath('/?network-efficiency-guardrails=true')
+      .run(async ({ page, intakeRegistry, flushEvents, withBrowserLogs }) => {
+        // Trigger a violation after the SDK has initialized: fetch an uncompressed JS resource.
+        // The Document-Policy header on the page opts into monitoring, and the lack of
+        // Content-Encoding on this endpoint triggers a "resource compression" violation.
+        await page.evaluate(() => fetch('/uncompressed-script.js'))
+
+        await flushEvents()
+
+        const guardrailErrors = intakeRegistry.rumErrorEvents.filter((event) =>
+          event.error.message.startsWith('document-policy-violation:')
+        )
+
+        // The SDK bundles themselves (served uncompressed in dev) also trigger violations,
+        // so we may receive more than one. Assert we got at least one for our resource.
+        expect(guardrailErrors.length).toBeGreaterThanOrEqual(1)
+
+        const error = guardrailErrors[0].error
+        expect(error.source).toBe('report')
+        expect(error.handling).toBe('unhandled')
+        expect(error.csp?.disposition).toMatch(/enforce|report/)
+
+        // The browser logs a console error for each violation — acknowledge them so the
+        // framework teardown check doesn't fail.
+        withBrowserLogs((logs) => {
+          const errors = logs.filter((log) => log.level === 'error')
+          expect(errors.length).toBeGreaterThanOrEqual(1)
+          expect(errors[0].message).toContain('Document policy violation: resource compression is required')
+        })
+      })
+  })
+
+  test.describe('Logs', () => {
+    createTest('should forward network-efficiency-guardrails violations via forwardReports')
+      .withLogs({ forwardReports: ['document-policy-violation'] })
+      .withBasePath('/?network-efficiency-guardrails=true')
+      .run(async ({ page, intakeRegistry, flushEvents, withBrowserLogs }) => {
+        await page.evaluate(() => fetch('/uncompressed-script.js'))
+
+        await flushEvents()
+
+        const guardrailLogs = intakeRegistry.logsEvents.filter((event) =>
+          event.message.startsWith('document-policy-violation:')
+        )
+
+        expect(guardrailLogs).toHaveLength(1)
+        expect(guardrailLogs[0].origin).toBe('report')
+        expect(guardrailLogs[0].status).toBe('error')
+
+        withBrowserLogs((logs) => {
+          expect(logs.filter((log) => log.level === 'error')).toHaveLength(1)
+          expect(logs[0].message).toContain('Document policy violation: resource compression is required')
+        })
+      })
+
+    createTest('should not forward network-efficiency-guardrails violations when not opted in')
+      .withLogs({ forwardReports: [] })
+      .withBasePath('/?network-efficiency-guardrails=true')
+      .run(async ({ page, intakeRegistry, flushEvents, withBrowserLogs }) => {
+        await page.evaluate(() => fetch('/uncompressed-script.js'))
+
+        await flushEvents()
+
+        const guardrailLogs = intakeRegistry.logsEvents.filter((event) =>
+          event.message.startsWith('document-policy-violation:')
+        )
+
+        expect(guardrailLogs).toHaveLength(0)
+
+        withBrowserLogs((logs) => {
+          expect(logs.filter((log) => log.level === 'error')).toHaveLength(1)
+          expect(logs[0].message).toContain('Document policy violation: resource compression is required')
+        })
+      })
+  })
+})