diff --git a/docs/src/test-reporter-api/class-suite.md b/docs/src/test-reporter-api/class-suite.md
index 0c0c75691f..fc6b3e0aa9 100644
--- a/docs/src/test-reporter-api/class-suite.md
+++ b/docs/src/test-reporter-api/class-suite.md
@@ -26,6 +26,12 @@ Reporter is given a root suite in the [`method: Reporter.onBegin`] method.
 
 Returns the list of all test cases in this suite and its descendants, as opposite to [`property: Suite.tests`].
 
+## method: Suite.entries
+* since: v1.44
+- type: <[Array]<[TestCase]|[Suite]>>
+
+Test cases and suites defined directly in this suite. The elements are returned in their declaration order. You can discriminate between different entry types using [`property: TestCase.type`] and [`property: Suite.type`].
+
 ## property: Suite.location
 * since: v1.10
 - type: ?<[Location]>
@@ -72,3 +78,10 @@ Suite title.
 - returns: <[Array]<[string]>>
 
 Returns a list of titles from the root down to this suite.
+
+## property: Suite.type
+* since: v1.44
+- returns: <[SuiteType]<'root' | 'project' | 'file' | 'describe'>>
+
+Returns the type of the suite. The Suites form the following hierarchy:
+`root` -> `project` -> `file` -> `describe` -> ...`describe` -> `test`.
diff --git a/docs/src/test-reporter-api/class-testcase.md b/docs/src/test-reporter-api/class-testcase.md
index d1e7b63927..0abfa5c8d4 100644
--- a/docs/src/test-reporter-api/class-testcase.md
+++ b/docs/src/test-reporter-api/class-testcase.md
@@ -108,3 +108,8 @@ Test title as passed to the [`method: Test.(call)`] call.
 
 Returns a list of titles from the root down to this test.
 
+## property: TestCase.type
+* since: v1.44
+- returns: <[TestCaseType]<'test'>>
+
+Returns type of the test.
diff --git a/packages/playwright/src/common/test.ts b/packages/playwright/src/common/test.ts
index 0d05ac5dfd..50f547b6ee 100644
--- a/packages/playwright/src/common/test.ts
+++ b/packages/playwright/src/common/test.ts
@@ -64,6 +64,14 @@ export class Suite extends Base {
     this._testTypeImpl = testTypeImpl;
   }
 
+  get type(): 'root' | 'project' | 'file' | 'describe' {
+    return this._type;
+  }
+
+  entries() {
+    return this._entries;
+  }
+
   get suites(): Suite[] {
     return this._entries.filter(entry => entry instanceof Suite) as Suite[];
   }
@@ -240,6 +248,7 @@ export class TestCase extends Base implements reporterTypes.TestCase {
   results: reporterTypes.TestResult[] = [];
   location: Location;
   parent!: Suite;
+  type: 'test' = 'test';
 
   expectedStatus: reporterTypes.TestStatus = 'passed';
   timeout = 0;
diff --git a/packages/playwright/src/isomorphic/teleReceiver.ts b/packages/playwright/src/isomorphic/teleReceiver.ts
index e675ce336b..879d37e010 100644
--- a/packages/playwright/src/isomorphic/teleReceiver.ts
+++ b/packages/playwright/src/isomorphic/teleReceiver.ts
@@ -57,8 +57,7 @@ export type JsonProject = {
 export type JsonSuite = {
   title: string;
   location?: JsonLocation;
-  suites: JsonSuite[];
-  tests: JsonTestCase[];
+  entries: (JsonSuite | JsonTestCase)[];
 };
 
 export type JsonTestCase = {
@@ -144,8 +143,7 @@ export class TeleReporterReceiver {
   }
 
   reset() {
-    this._rootSuite.suites = [];
-    this._rootSuite.tests = [];
+    this._rootSuite._entries = [];
     this._tests.clear();
   }
 
@@ -203,12 +201,12 @@ export class TeleReporterReceiver {
     let projectSuite = this._options.mergeProjects ? this._rootSuite.suites.find(suite => suite.project()!.name === project.name) : undefined;
     if (!projectSuite) {
       projectSuite = new TeleSuite(project.name, 'project');
-      this._rootSuite.suites.push(projectSuite);
-      projectSuite.parent = this._rootSuite;
+      this._rootSuite._addSuite(projectSuite);
     }
     // Always update project in watch mode.
     projectSuite._project = this._parseProject(project);
-    this._mergeSuitesInto(project.suites, projectSuite);
+    for (const suite of project.suites)
+      this._mergeSuiteInto(suite, projectSuite);
   }
 
   private _onBegin() {
@@ -336,31 +334,29 @@ export class TeleReporterReceiver {
     });
   }
 
-  private _mergeSuitesInto(jsonSuites: JsonSuite[], parent: TeleSuite) {
-    for (const jsonSuite of jsonSuites) {
-      let targetSuite = parent.suites.find(s => s.title === jsonSuite.title);
-      if (!targetSuite) {
-        targetSuite = new TeleSuite(jsonSuite.title, parent._type === 'project' ? 'file' : 'describe');
-        targetSuite.parent = parent;
-        parent.suites.push(targetSuite);
-      }
-      targetSuite.location = this._absoluteLocation(jsonSuite.location);
-      this._mergeSuitesInto(jsonSuite.suites, targetSuite);
-      this._mergeTestsInto(jsonSuite.tests, targetSuite);
+  private _mergeSuiteInto(jsonSuite: JsonSuite, parent: TeleSuite): void {
+    let targetSuite = parent.suites.find(s => s.title === jsonSuite.title);
+    if (!targetSuite) {
+      targetSuite = new TeleSuite(jsonSuite.title, parent.type === 'project' ? 'file' : 'describe');
+      parent._addSuite(targetSuite);
     }
+    targetSuite.location = this._absoluteLocation(jsonSuite.location);
+    jsonSuite.entries.forEach(e => {
+      if ('testId' in e)
+        this._mergeTestInto(e, targetSuite!);
+      else
+        this._mergeSuiteInto(e, targetSuite!);
+    });
   }
 
-  private _mergeTestsInto(jsonTests: JsonTestCase[], parent: TeleSuite) {
-    for (const jsonTest of jsonTests) {
-      let targetTest = this._options.mergeTestCases ? parent.tests.find(s => s.title === jsonTest.title && s.repeatEachIndex === jsonTest.repeatEachIndex) : undefined;
-      if (!targetTest) {
-        targetTest = new TeleTestCase(jsonTest.testId, jsonTest.title, this._absoluteLocation(jsonTest.location), jsonTest.repeatEachIndex);
-        targetTest.parent = parent;
-        parent.tests.push(targetTest);
-        this._tests.set(targetTest.id, targetTest);
-      }
-      this._updateTest(jsonTest, targetTest);
+  private _mergeTestInto(jsonTest: JsonTestCase, parent: TeleSuite) {
+    let targetTest = this._options.mergeTestCases ? parent.tests.find(s => s.title === jsonTest.title && s.repeatEachIndex === jsonTest.repeatEachIndex) : undefined;
+    if (!targetTest) {
+      targetTest = new TeleTestCase(jsonTest.testId, jsonTest.title, this._absoluteLocation(jsonTest.location), jsonTest.repeatEachIndex);
+      parent._addTest(targetTest);
+      this._tests.set(targetTest.id, targetTest);
     }
+    this._updateTest(jsonTest, targetTest);
   }
 
   private _updateTest(payload: JsonTestCase, test: TeleTestCase): TeleTestCase {
@@ -395,28 +391,43 @@ export class TeleSuite implements reporterTypes.Suite {
   title: string;
   location?: reporterTypes.Location;
   parent?: TeleSuite;
+  _entries: (TeleSuite | TeleTestCase)[] = [];
   _requireFile: string = '';
-  suites: TeleSuite[] = [];
-  tests: TeleTestCase[] = [];
   _timeout: number | undefined;
   _retries: number | undefined;
   _project: TeleFullProject | undefined;
   _parallelMode: 'none' | 'default' | 'serial' | 'parallel' = 'none';
-  readonly _type: 'root' | 'project' | 'file' | 'describe';
+  private readonly _type: 'root' | 'project' | 'file' | 'describe';
 
   constructor(title: string, type: 'root' | 'project' | 'file' | 'describe') {
     this.title = title;
     this._type = type;
   }
 
-  allTests(): TeleTestCase[] {
-    const result: TeleTestCase[] = [];
-    const visit = (suite: TeleSuite) => {
-      for (const entry of [...suite.suites, ...suite.tests]) {
-        if (entry instanceof TeleSuite)
-          visit(entry);
-        else
+  get type() {
+    return this._type;
+  }
+
+  get suites(): TeleSuite[] {
+    return this._entries.filter(e => e.type !== 'test') as TeleSuite[];
+  }
+
+  get tests(): TeleTestCase[] {
+    return this._entries.filter(e => e.type === 'test') as TeleTestCase[];
+  }
+
+  entries() {
+    return this._entries;
+  }
+
+  allTests(): reporterTypes.TestCase[] {
+    const result: reporterTypes.TestCase[] = [];
+    const visit = (suite: reporterTypes.Suite) => {
+      for (const entry of suite.entries()) {
+        if (entry.type === 'test')
           result.push(entry);
+        else
+          visit(entry);
       }
     };
     visit(this);
@@ -434,6 +445,16 @@ export class TeleSuite implements reporterTypes.Suite {
   project(): TeleFullProject | undefined {
     return this._project ?? this.parent?.project();
   }
+
+  _addTest(test: TeleTestCase) {
+    test.parent = this;
+    this._entries.push(test);
+  }
+
+  _addSuite(suite: TeleSuite) {
+    suite.parent = this;
+    this._entries.push(suite);
+  }
 }
 
 export class TeleTestCase implements reporterTypes.TestCase {
@@ -442,6 +463,7 @@ export class TeleTestCase implements reporterTypes.TestCase {
   results: TeleTestResult[] = [];
   location: reporterTypes.Location;
   parent!: TeleSuite;
+  type: 'test' = 'test';
 
   expectedStatus: reporterTypes.TestStatus = 'passed';
   timeout = 0;
diff --git a/packages/playwright/src/reporters/blob.ts b/packages/playwright/src/reporters/blob.ts
index 019fa8b7ca..1c95658f6c 100644
--- a/packages/playwright/src/reporters/blob.ts
+++ b/packages/playwright/src/reporters/blob.ts
@@ -32,7 +32,7 @@ type BlobReporterOptions = {
   fileName?: string;
 };
 
-export const currentBlobReportVersion = 1;
+export const currentBlobReportVersion = 2;
 
 export type BlobReportMetadata = {
   version: number;
diff --git a/packages/playwright/src/reporters/html.ts b/packages/playwright/src/reporters/html.ts
index 8f38346c83..9b67ea69b4 100644
--- a/packages/playwright/src/reporters/html.ts
+++ b/packages/playwright/src/reporters/html.ts
@@ -246,7 +246,7 @@ class HtmlBuilder {
         }
         const { testFile, testFileSummary } = fileEntry;
         const testEntries: TestEntry[] = [];
-        this._processJsonSuite(fileSuite, fileId, projectSuite.project()!.name, [], testEntries);
+        this._processSuite(fileSuite, fileId, projectSuite.project()!.name, [], testEntries);
         for (const test of testEntries) {
           testFile.tests.push(test.testCase);
           testFileSummary.tests.push(test.testCaseSummary);
@@ -346,10 +346,14 @@ class HtmlBuilder {
     this._dataZipFile.addBuffer(Buffer.from(JSON.stringify(data)), fileName);
   }
 
-  private _processJsonSuite(suite: Suite, fileId: string, projectName: string, path: string[], outTests: TestEntry[]) {
+  private _processSuite(suite: Suite, fileId: string, projectName: string, path: string[], outTests: TestEntry[]) {
     const newPath = [...path, suite.title];
-    suite.suites.forEach(s => this._processJsonSuite(s, fileId, projectName, newPath, outTests));
-    suite.tests.forEach(t => outTests.push(this._createTestEntry(fileId, t, projectName, newPath)));
+    suite.entries().forEach(e => {
+      if (e.type === 'test')
+        outTests.push(this._createTestEntry(fileId, e, projectName, newPath));
+      else
+        this._processSuite(e, fileId, projectName, newPath, outTests);
+    });
   }
 
   private _createTestEntry(fileId: string, test: TestCasePublic, projectName: string, path: string[]): TestEntry {
diff --git a/packages/playwright/src/reporters/merge.ts b/packages/playwright/src/reporters/merge.ts
index 1aba179549..90eb22f1a7 100644
--- a/packages/playwright/src/reporters/merge.ts
+++ b/packages/playwright/src/reporters/merge.ts
@@ -18,7 +18,7 @@ import fs from 'fs';
 import path from 'path';
 import type { ReporterDescription } from '../../types/test';
 import type { FullConfigInternal } from '../common/config';
-import type { JsonConfig, JsonEvent, JsonFullResult, JsonLocation, JsonProject, JsonSuite, JsonTestResultEnd, JsonTestStepStart } from '../isomorphic/teleReceiver';
+import type { JsonConfig, JsonEvent, JsonFullResult, JsonLocation, JsonProject, JsonSuite, JsonTestCase, JsonTestResultEnd, JsonTestStepStart } from '../isomorphic/teleReceiver';
 import { TeleReporterReceiver } from '../isomorphic/teleReceiver';
 import { JsonStringInternalizer, StringInternPool } from '../isomorphic/stringInternPool';
 import { createReporters } from '../runner/reporters';
@@ -27,6 +27,7 @@ import { ZipFile } from 'playwright-core/lib/utils';
 import { currentBlobReportVersion, type BlobReportMetadata } from './blob';
 import { relativeFilePath } from '../util';
 import type { TestError } from '../../types/testReporter';
+import type * as blobV1 from './versions/blobV1';
 
 type StatusCallback = (message: string) => void;
 
@@ -136,15 +137,17 @@ async function extractAndParseReports(dir: string, shardFiles: string[], interna
       const content = await zipFile.read(entryName);
       if (entryName.endsWith('.jsonl')) {
         fileName = reportNames.makeUnique(fileName);
-        const parsedEvents = parseCommonEvents(content);
+        let parsedEvents = parseCommonEvents(content);
         // Passing reviver to JSON.parse doesn't work, as the original strings
         // keep beeing used. To work around that we traverse the parsed events
         // as a post-processing step.
         internalizer.traverse(parsedEvents);
+        const metadata = findMetadata(parsedEvents, file);
+        parsedEvents = modernizer.modernize(metadata.version, parsedEvents);
         shardEvents.push({
           file,
           localPath: fileName,
-          metadata: findMetadata(parsedEvents, file),
+          metadata,
           parsedEvents
         });
       }
@@ -386,14 +389,20 @@ class IdsPatcher {
   }
 
   private _updateTestIds(suite: JsonSuite) {
-    suite.tests.forEach(test => {
-      test.testId = this._mapTestId(test.testId);
-      if (this._botName) {
-        test.tags = test.tags || [];
-        test.tags.unshift('@' + this._botName);
-      }
+    suite.entries.forEach(entry => {
+      if ('testId' in entry)
+        this._updateTestId(entry);
+      else
+        this._updateTestIds(entry);
     });
-    suite.suites.forEach(suite => this._updateTestIds(suite));
+  }
+
+  private _updateTestId(test: JsonTestCase) {
+    test.testId = this._mapTestId(test.testId);
+    if (this._botName) {
+      test.tags = test.tags || [];
+      test.tags.unshift('@' + this._botName);
+    }
   }
 
   private _mapTestId(testId: string): string {
@@ -459,10 +468,12 @@ class PathSeparatorPatcher {
     this._updateLocation(suite.location);
     if (isFileSuite)
       suite.title = this._updatePath(suite.title);
-    for (const child of suite.suites)
-      this._updateSuite(child);
-    for (const test of suite.tests)
-      this._updateLocation(test.location);
+    for (const entry of suite.entries) {
+      if ('testId' in entry)
+        this._updateLocation(entry.location);
+      else
+        this._updateSuite(entry);
+    }
   }
 
   private _updateLocation(location?: JsonLocation) {
@@ -507,3 +518,37 @@ class JsonEventPatchers {
     }
   }
 }
+
+class BlobModernizer {
+  modernize(fromVersion: number, events: JsonEvent[]): JsonEvent[] {
+    const result = [];
+    for (const event of events)
+      result.push(...this._modernize(fromVersion, event));
+    return result;
+  }
+
+  private _modernize(fromVersion: number, event: JsonEvent): JsonEvent[] {
+    let events = [event];
+    for (let version = fromVersion; version < currentBlobReportVersion; ++version)
+      events = (this as any)[`_modernize_${version}_to_${version + 1}`].call(this, events);
+    return events;
+  }
+
+  _modernize_1_to_2(events: JsonEvent[]): JsonEvent[] {
+    return events.map(event => {
+      if (event.method === 'onProject') {
+        const modernizeSuite = (suite: blobV1.JsonSuite): JsonSuite => {
+          const newSuites = suite.suites.map(modernizeSuite);
+          // eslint-disable-next-line @typescript-eslint/no-unused-vars
+          const { suites, tests, ...remainder } = suite;
+          return { entries: [...newSuites, ...tests], ...remainder };
+        };
+        const project = event.params.project;
+        project.suites = project.suites.map(modernizeSuite);
+      }
+      return event;
+    });
+  }
+}
+
+const modernizer = new BlobModernizer();
\ No newline at end of file
diff --git a/packages/playwright/src/reporters/teleEmitter.ts b/packages/playwright/src/reporters/teleEmitter.ts
index 2baef221aa..c374c5abe9 100644
--- a/packages/playwright/src/reporters/teleEmitter.ts
+++ b/packages/playwright/src/reporters/teleEmitter.ts
@@ -189,8 +189,11 @@ export class TeleReporterEmitter implements ReporterV2 {
     const result = {
       title: suite.title,
       location: this._relativeLocation(suite.location),
-      suites: suite.suites.map(s => this._serializeSuite(s)),
-      tests: suite.tests.map(t => this._serializeTest(t)),
+      entries: suite.entries().map(e => {
+        if (e.type === 'test')
+          return this._serializeTest(e);
+        return this._serializeSuite(e);
+      })
     };
     return result;
   }
diff --git a/packages/playwright/src/reporters/versions/blobV1.ts b/packages/playwright/src/reporters/versions/blobV1.ts
new file mode 100644
index 0000000000..5ea9350285
--- /dev/null
+++ b/packages/playwright/src/reporters/versions/blobV1.ts
@@ -0,0 +1,127 @@
+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import type { Metadata } from '../../../types/test';
+import type * as reporterTypes from '../../../types/testReporter';
+
+export type JsonLocation = reporterTypes.Location;
+export type JsonError = string;
+export type JsonStackFrame = { file: string, line: number, column: number };
+
+export type JsonStdIOType = 'stdout' | 'stderr';
+
+export type JsonConfig = Pick<reporterTypes.FullConfig, 'configFile' | 'globalTimeout' | 'maxFailures' | 'metadata' | 'rootDir' | 'version' | 'workers'>;
+
+export type JsonPattern = {
+  s?: string;
+  r?: { source: string, flags: string };
+};
+
+export type JsonProject = {
+  grep: JsonPattern[];
+  grepInvert: JsonPattern[];
+  metadata: Metadata;
+  name: string;
+  dependencies: string[];
+  // This is relative to root dir.
+  snapshotDir: string;
+  // This is relative to root dir.
+  outputDir: string;
+  repeatEach: number;
+  retries: number;
+  suites: JsonSuite[];
+  teardown?: string;
+  // This is relative to root dir.
+  testDir: string;
+  testIgnore: JsonPattern[];
+  testMatch: JsonPattern[];
+  timeout: number;
+};
+
+export type JsonSuite = {
+  title: string;
+  location?: JsonLocation;
+  suites: JsonSuite[];
+  tests: JsonTestCase[];
+};
+
+export type JsonTestCase = {
+  testId: string;
+  title: string;
+  location: JsonLocation;
+  retries: number;
+  tags?: string[];
+  repeatEachIndex: number;
+};
+
+export type JsonTestEnd = {
+  testId: string;
+  expectedStatus: reporterTypes.TestStatus;
+  timeout: number;
+  annotations: { type: string, description?: string }[];
+};
+
+export type JsonTestResultStart = {
+  id: string;
+  retry: number;
+  workerIndex: number;
+  parallelIndex: number;
+  startTime: number;
+};
+
+export type JsonAttachment = Omit<reporterTypes.TestResult['attachments'][0], 'body'> & { base64?: string };
+
+export type JsonTestResultEnd = {
+  id: string;
+  duration: number;
+  status: reporterTypes.TestStatus;
+  errors: reporterTypes.TestError[];
+  attachments: JsonAttachment[];
+};
+
+export type JsonTestStepStart = {
+  id: string;
+  parentStepId?: string;
+  title: string;
+  category: string,
+  startTime: number;
+  location?: reporterTypes.Location;
+};
+
+export type JsonTestStepEnd = {
+  id: string;
+  duration: number;
+  error?: reporterTypes.TestError;
+};
+
+export type JsonFullResult = {
+  status: reporterTypes.FullResult['status'];
+  startTime: number;
+  duration: number;
+};
+
+export type JsonEvent = {
+  method: string;
+  params: any
+};
+
+export type BlobReportMetadata = {
+  version: number;
+  userAgent: string;
+  name?: string;
+  shard?: { total: number, current: number };
+  pathSeparator?: string;
+};
diff --git a/packages/playwright/types/testReporter.d.ts b/packages/playwright/types/testReporter.d.ts
index ed6f62e71d..987d51e004 100644
--- a/packages/playwright/types/testReporter.d.ts
+++ b/packages/playwright/types/testReporter.d.ts
@@ -40,6 +40,11 @@ export type { FullConfig, TestStatus, FullProject } from './test';
  * [reporter.onBegin(config, suite)](https://playwright.dev/docs/api/class-reporter#reporter-on-begin) method.
  */
 export interface Suite {
+  /**
+   * Returns the type of the suite. The Suites form the following hierarchy: `root` -> `project` -> `file` -> `describe`
+   * -> ...`describe` -> `test`.
+   */
+  type: 'root' | 'project' | 'file' | 'describe';
   /**
    * Configuration of the project this suite belongs to, or [void] for the root suite.
    */
@@ -50,6 +55,14 @@ export interface Suite {
    */
   allTests(): Array<TestCase>;
 
+  /**
+   * Test cases and suites defined directly in this suite. The elements are returned in their declaration order. You can
+   * discriminate between different entry types using
+   * [testCase.type](https://playwright.dev/docs/api/class-testcase#test-case-type) and
+   * [suite.type](https://playwright.dev/docs/api/class-suite#suite-type).
+   */
+  entries(): Array<TestCase|Suite>;
+
   /**
    * Returns a list of titles from the root down to this suite.
    */
@@ -98,6 +111,10 @@ export interface Suite {
  * projects' suites.
  */
 export interface TestCase {
+  /**
+   * Returns type of the test.
+   */
+  type: 'test';
   /**
    * Expected test status.
    * - Tests marked as
diff --git a/tests/assets/blob-1.42.zip b/tests/assets/blob-1.42.zip
new file mode 100644
index 0000000000..da16671ccc
Binary files /dev/null and b/tests/assets/blob-1.42.zip differ
diff --git a/tests/playwright-test/reporter-blob.spec.ts b/tests/playwright-test/reporter-blob.spec.ts
index e57d8ff223..2ddfcfcc96 100644
--- a/tests/playwright-test/reporter-blob.spec.ts
+++ b/tests/playwright-test/reporter-blob.spec.ts
@@ -1281,7 +1281,7 @@ test('blob report should include version', async ({ runInlineTest }) => {
 
   const events = await extractReport(test.info().outputPath('blob-report', 'report.zip'), test.info().outputPath('tmp'));
   const metadataEvent = events.find(e => e.method === 'onBlobReportMetadata');
-  expect(metadataEvent.params.version).toBe(1);
+  expect(metadataEvent.params.version).toBe(2);
   expect(metadataEvent.params.userAgent).toBe(getUserAgent());
 });
 
@@ -1703,3 +1703,52 @@ test('TestSuite.project() should return owning project', async ({ runInlineTest,
   expect(exitCode).toBe(0);
   expect(output).toContain(`test project: my-project`);
 });
+
+test('open blob-1.42', async ({ runInlineTest, mergeReports }) => {
+  test.info().annotations.push({ type: 'issue', description: 'https://github.com/microsoft/playwright/issues/29984' });
+  await runInlineTest({
+    'echo-reporter.js': `
+      export default class EchoReporter {
+        lines = [];
+        onTestBegin(test) {
+          this.lines.push(test.titlePath().join(' > '));
+        }
+        onEnd() {
+          console.log(this.lines.join('\\n'));
+        }
+      };
+    `,
+    'merge.config.ts': `module.exports = {
+      testDir: 'mergeRoot',
+      reporter: './echo-reporter.js'
+     };`,
+  });
+
+  const blobDir = test.info().outputPath('blob-report');
+  await fs.promises.mkdir(blobDir, { recursive: true });
+  await fs.promises.copyFile(path.join(__dirname, '../assets/blob-1.42.zip'), path.join(blobDir, 'blob-1.42.zip'));
+
+  const { exitCode, output } = await mergeReports(blobDir, undefined, { additionalArgs: ['--config', 'merge.config.ts'] });
+  expect(exitCode).toBe(0);
+  expect(output).toContain(` > chromium > example.spec.ts > test 0
+ > chromium > example.spec.ts > describe 1 > describe 2 > test 3
+ > chromium > example.spec.ts > describe 1 > describe 2 > test 4
+ > chromium > example.spec.ts > describe 1 > describe 2 > test 2
+ > chromium > example.spec.ts > describe 1 > test 1
+ > chromium > example.spec.ts > describe 1 > test 5
+ > chromium > example.spec.ts > test 6
+ > firefox > example.spec.ts > describe 1 > describe 2 > test 2
+ > firefox > example.spec.ts > describe 1 > describe 2 > test 3
+ > firefox > example.spec.ts > test 0
+ > firefox > example.spec.ts > describe 1 > describe 2 > test 4
+ > firefox > example.spec.ts > describe 1 > test 1
+ > firefox > example.spec.ts > test 6
+ > firefox > example.spec.ts > describe 1 > test 5
+ > webkit > example.spec.ts > describe 1 > describe 2 > test 4
+ > webkit > example.spec.ts > test 0
+ > webkit > example.spec.ts > describe 1 > test 1
+ > webkit > example.spec.ts > describe 1 > describe 2 > test 2
+ > webkit > example.spec.ts > describe 1 > describe 2 > test 3
+ > webkit > example.spec.ts > test 6
+ > webkit > example.spec.ts > describe 1 > test 5`);
+});
diff --git a/tests/playwright-test/reporter-html.spec.ts b/tests/playwright-test/reporter-html.spec.ts
index ad39504c64..f8a8215960 100644
--- a/tests/playwright-test/reporter-html.spec.ts
+++ b/tests/playwright-test/reporter-html.spec.ts
@@ -2058,6 +2058,39 @@ for (const useIntermediateMergeReport of [false, true] as const) {
       ]);
     });
 
+    test('html report should preserve declaration order within file', async ({ runInlineTest, showReport, page }) => {
+      test.info().annotations.push({ type: 'issue', description: 'https://github.com/microsoft/playwright/issues/29984' });
+      await runInlineTest({
+        'main.spec.ts': `
+          import { test, expect } from '@playwright/test';
+          test('test 0', async ({}) => {});
+          test.describe('describe 1', () => {
+            test('test 1', async ({}) => {});
+            test.describe('describe 2', () => {
+              test('test 2', async ({}) => {});
+              test('test 3', async ({}) => {});
+              test('test 4', async ({}) => {});
+            });
+            test('test 5', async ({}) => {});
+          });
+          test('test 6', async ({}) => {});
+        `,
+      }, { reporter: 'html' }, { PW_TEST_HTML_REPORT_OPEN: 'never' });
+
+      await showReport();
+
+      // Failing test first, then sorted by the run order.
+      await expect(page.locator('.test-file-title')).toHaveText([
+        /test 0/,
+        /describe 1 › test 1/,
+        /describe 1 › describe 2 › test 2/,
+        /describe 1 › describe 2 › test 3/,
+        /describe 1 › describe 2 › test 4/,
+        /describe 1 › test 5/,
+        /test 6/,
+      ]);
+    });
+
     test('tests should filter by file', async ({ runInlineTest, showReport, page }) => {
       const result = await runInlineTest({
         'file-a.test.js': `
diff --git a/utils/generate_types/overrides-testReporter.d.ts b/utils/generate_types/overrides-testReporter.d.ts
index 9aeb9c9d31..8faa956928 100644
--- a/utils/generate_types/overrides-testReporter.d.ts
+++ b/utils/generate_types/overrides-testReporter.d.ts
@@ -18,10 +18,12 @@ import type { FullConfig, FullProject, TestStatus, Metadata } from './test';
 export type { FullConfig, TestStatus, FullProject } from './test';
 
 export interface Suite {
+  type: 'root' | 'project' | 'file' | 'describe';
   project(): FullProject | undefined;
 }
 
 export interface TestCase {
+  type: 'test';
   expectedStatus: TestStatus;
 }