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diff --git a/testing/web-platform/tests/fledge/tentative/join-leave-ad-interest-group.https.sub.window.js b/testing/web-platform/tests/fledge/tentative/join-leave-ad-interest-group.https.sub.window.js
new file mode 100644
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+++ b/testing/web-platform/tests/fledge/tentative/join-leave-ad-interest-group.https.sub.window.js
@@ -0,0 +1,570 @@
+// META: script=/resources/testdriver.js
+// META: script=/common/utils.js
+// META: script=resources/fledge-util.js
+
+"use strict;"
+
+// These tests are focused on joinAdInterestGroup() and leaveAdInterestGroup().
+// Most join tests do not run auctions, but instead only check the result of
+// the returned promise, since testing that interest groups are actually
+// joined, and that each interestGroup field behaves as intended, are covered
+// by other tests.
+
+// Minimal fields needed for a valid interest group. Used in most test cases.
+const BASE_INTEREST_GROUP = {
+  owner: window.location.origin,
+  name: 'default name',
+}
+
+// Each test case attempts to join and then leave an interest group, checking
+// if any exceptions are thrown from either operation.
+const SIMPLE_JOIN_LEAVE_TEST_CASES = [
+  { expectJoinSucces: false,
+    expectLeaveSucces: false,
+    interestGroup: null
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: false,
+    interestGroup: {}
+  },
+
+  // Basic success test case.
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: BASE_INTEREST_GROUP
+  },
+
+  // "owner" tests
+  { expectJoinSucces: false,
+    expectLeaveSucces: false,
+    interestGroup: { name: 'default name' }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: false,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     owner: null}
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: false,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     owner: window.location.origin.replace('https', 'http')}
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: false,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     owner: window.location.origin.replace('https', 'wss')}
+  },
+  // Cross-origin joins and leaves are not allowed without .well-known
+  // permissions.
+  { expectJoinSucces: false,
+    expectLeaveSucces: false,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     owner: '{{hosts[][www]}}' }
+  },
+
+  // "name" tests
+  { expectJoinSucces: false,
+    expectLeaveSucces: false,
+    interestGroup: { owner: window.location.origin }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     name: ''}
+  },
+
+  // "priority" tests
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     priority: 1}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     priority: 0}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     priority: -1.5}
+  },
+
+  // "priorityVector" tests
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     priorityVector: null}
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     priorityVector: 1}
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     priorityVector: {a: 'apple'}}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     priorityVector: {}}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     priorityVector: {a: 1}}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     priorityVector: {'a': 1, 'b': -4.5, 'a.b': 0}}
+  },
+
+  // "prioritySignalsOverrides" tests
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     prioritySignalsOverrides: null}
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     prioritySignalsOverrides: 1}
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     prioritySignalsOverrides: {a: 'apple'}}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     prioritySignalsOverrides: {}}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     prioritySignalsOverrides: {a: 1}}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     prioritySignalsOverrides: {'a': 1, 'b': -4.5, 'a.b': 0}}
+  },
+
+  // "enableBiddingSignalsPrioritization" tests
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     enableBiddingSignalsPrioritization: true}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     enableBiddingSignalsPrioritization: false}
+  },
+
+  // "biddingLogicUrl" tests
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     biddingLogicUrl: null }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     biddingLogicUrl: 'https://{{hosts[][www]}}/foo.js' }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     biddingLogicUrl: 'data:text/javascript,Foo' }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     biddingLogicUrl: `${window.location.origin}/foo.js`}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     biddingLogicUrl: 'relative/path' }
+  },
+
+  // "biddingWasmHelperUrl" tests
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     biddingWasmHelperUrl: null }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     biddingWasmHelperUrl: 'https://{{hosts[][www]}}/foo.js' }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     biddingWasmHelperUrl: 'data:application/wasm,Foo' }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     biddingWasmHelperUrl: `${window.location.origin}/foo.js`}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     biddingWasmHelperUrl: 'relative/path' }
+  },
+
+  // "dailyUpdateUrl" tests
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     dailyUpdateUrl: null }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     dailyUpdateUrl: 'https://{{hosts[][www]}}/foo.js' }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     dailyUpdateUrl: 'data:application/wasm,Foo' }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     dailyUpdateUrl: `${window.location.origin}/foo.js`}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     dailyUpdateUrl: 'relative/path' }
+  },
+
+  // "executionMode" tests
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     executionMode: 'compatibility' }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     executionMode: 'groupByOrigin' }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     executionMode: 'unknownValuesAreValid' }
+  },
+
+  // "trustedBiddingSignalsUrl" tests
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     trustedBiddingSignalsUrl: null }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     trustedBiddingSignalsUrl: 'https://{{hosts[][www]}}/foo.js' }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     trustedBiddingSignalsUrl: 'data:application/json,{}' }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     trustedBiddingSignalsUrl: `${window.location.origin}/foo.js`}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     trustedBiddingSignalsUrl: 'relative/path' }
+  },
+
+  // "trustedBiddingSignalsKeys" tests
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     trustedBiddingSignalsKeys: null }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     trustedBiddingSignalsKeys: {}}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     trustedBiddingSignalsKeys: []}
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     trustedBiddingSignalsKeys: ['a', 4, 'Foo']}
+  },
+
+  // "userBiddingSignals" tests
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     userBiddingSignals: null }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     userBiddingSignals: 'foo' }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     userBiddingSignals: 15 }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     userBiddingSignals: [5, 'foo', [-6.4, {a: 'b'}]] }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     userBiddingSignals: {a: [5, 'foo', {b: -6.4}] }}
+  },
+
+  // "ads" tests
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     ads: null }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     ads: 5 }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     ads: {} }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     ads: [] }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     ads: [{}] }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     ads: [{metadata: [{a:'b'}, 'c'], 1:[2,3]}] }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     ads: [{renderUrl: 'https://somewhere.test/'}] }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     ads: [{renderUrl: 'https://somewhere.test/'},
+                           {renderUrl: 'https://somewhere-else.test/'}] }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     ads: [{renderUrl: 'https://somewhere.test/',
+                            metadata: null}] }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     ads: [{renderUrl: 'https://somewhere.test/',
+                            metadata: null,
+                            someOtherField: 'foo'}] }
+  },
+
+  // "adComponents" tests
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     adComponents: null }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     adComponents: 5 }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     adComponents: {} }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     adComponents: [] }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     adComponents: [{}] }
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     adComponents: [{metadata: [{a:'b'}, 'c'], 1:[2,3]}] }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     adComponents: [{renderUrl: 'https://somewhere.test/'}] }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     adComponents: [{renderUrl: 'https://somewhere.test/'},
+                                    {renderUrl: 'https://elsewhere.test/'}] }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     adComponents: [{renderUrl: 'https://somewhere.test/',
+                                     metadata: null}] }
+  },
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     adComponents: [{renderUrl: 'https://somewhere.test/',
+                                     metadata: null,
+                                     someOtherField: 'foo'}] }
+  },
+
+  // Miscellaneous tests.
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     extra: false,
+                     fields: {do:'not'},
+                     matter: 'at',
+                     all: [3,4,5] }
+  },
+
+  // Interest group dictionaries must be less than 1 MB (1048576 bytes), so
+  // test that here by using a large name on an otherwise valid interest group
+  // dictionary. The first case is the largest name value that still results in
+  // a valid dictionary, whereas the second test case produces a dictionary
+  // that's one byte too large.
+  { expectJoinSucces: true,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     name: 'a'.repeat(1048528) },
+    testCaseName: "Largest possible interest group dictionary",
+  },
+  { expectJoinSucces: false,
+    expectLeaveSucces: true,
+    interestGroup: { ...BASE_INTEREST_GROUP,
+                     name: 'a'.repeat(1048529) },
+    testCaseName: "Oversized interest group dictionary",
+  },
+];
+
+for (testCase of SIMPLE_JOIN_LEAVE_TEST_CASES) {
+  var test_name = 'Join and leave interest group: ';
+  if ('testCaseName' in testCase) {
+    test_name += testCase.testCaseName;
+  } else {
+    test_name += JSON.stringify(testCase);
+  }
+
+  promise_test((async (testCase) => {
+    const INTEREST_GROUP_LIFETIME_SECS = 1;
+
+    let join_promise = navigator.joinAdInterestGroup(testCase.interestGroup,
+                                                     INTEREST_GROUP_LIFETIME_SECS);
+    assert_true(join_promise instanceof Promise, "join should return a promise");
+    if (testCase.expectJoinSucces) {
+      assert_equals(await join_promise, undefined);
+    } else {
+      let joinExceptionThrown = false;
+      try {
+        await join_promise;
+      } catch (e) {
+        joinExceptionThrown = true;
+      }
+      assert_true(joinExceptionThrown, 'Exception not thrown on join.');
+    }
+
+    let leave_promise = navigator.leaveAdInterestGroup(testCase.interestGroup);
+    assert_true(leave_promise instanceof Promise, "leave should return a promise");
+    if (testCase.expectLeaveSucces) {
+      assert_equals(await leave_promise, undefined);
+    } else {
+      let leaveExceptionThrown = false;
+      try {
+        await leave_promise;
+      } catch (e) {
+        leaveExceptionThrown = true;
+      }
+      assert_true(leaveExceptionThrown, 'Exception not thrown on leave.');
+    }
+  }).bind(undefined, testCase), test_name);
+}
+
+promise_test(async test => {
+  const uuid = generateUuid(test);
+
+  // Joining an interest group without a bidding script and run an auction.
+  // There should be no winner.
+  await joinInterestGroup(test, uuid, { biddingLogicUrl: null });
+  assert_equals(null, await runBasicFledgeAuction(test, uuid),
+                'Auction unexpectedly had a winner');
+
+  // Joining an interest group with a bidding script and the same owner/name as
+  // the previously joined interest group, and re-run the auction. There should
+  // be a winner this time.
+  await joinInterestGroup(test, uuid);
+  let config = await runBasicFledgeAuction(test, uuid);
+  assert_true(config instanceof FencedFrameConfig,
+              'Wrong value type returned from auction: ' +
+              config.constructor.name);
+
+  // Re-join the first interest group, and re-run the auction. The interest
+  // group should be overwritten again, and there should be no winner.
+  await joinInterestGroup(test, uuid, { biddingLogicUrl: null });
+  assert_equals(null, await runBasicFledgeAuction(test, uuid),
+                'Auction unexpectedly had a winner');
+}, 'Join same interest group overwrites old matching group.');
+
+promise_test(async test => {
+  const uuid = generateUuid(test);
+
+  // Join an interest group, run an auction to make sure it was joined.
+  await joinInterestGroup(test, uuid);
+  let config = await runBasicFledgeAuction(test, uuid);
+  assert_true(config instanceof FencedFrameConfig,
+              'Wrong value type returned from auction: ' +
+              config.constructor.name);
+
+  // Leave the interest group, re-run the auction. There should be no winner.
+  await leaveInterestGroup();
+  assert_equals(null, await runBasicFledgeAuction(test, uuid),
+                'Auction unexpectedly had a winner');
+}, 'Leaving interest group actually leaves interest group.');
+
+promise_test(async test => {
+  // This should not throw.
+  await leaveInterestGroup({ name: 'Never join group' });
+}, 'Leave an interest group that was never joined.');