diff --git a/testing/web-platform/meta/web-locks/frames.tentative.https.html.ini b/testing/web-platform/meta/web-locks/frames.tentative.https.html.ini
index 1197d867ed38..f259eff8f0d8 100644
--- a/testing/web-platform/meta/web-locks/frames.tentative.https.html.ini
+++ b/testing/web-platform/meta/web-locks/frames.tentative.https.html.ini
@@ -1,23 +1,22 @@
 [frames.tentative.https.html]
-  expected: TIMEOUT
   [Window and Frame - shared mode]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Window and Frame - exclusive mode]
-    expected: NOTRUN
+    expected: FAIL
 
   [Frame and Frame - exclusive mode]
-    expected: NOTRUN
+    expected: FAIL
 
   [Terminated Frame with held lock]
-    expected: NOTRUN
+    expected: FAIL
 
   [Navigated Frame with held lock]
-    expected: NOTRUN
+    expected: FAIL
 
   [Navigated Frame with pending request]
-    expected: NOTRUN
+    expected: FAIL
 
   [Removed Frame with pending request]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/testing/web-platform/meta/web-locks/query-ordering.tentative.https.html.ini b/testing/web-platform/meta/web-locks/query-ordering.tentative.https.html.ini
index 99cf293ac0f4..57f0a6dcf0d3 100644
--- a/testing/web-platform/meta/web-locks/query-ordering.tentative.https.html.ini
+++ b/testing/web-platform/meta/web-locks/query-ordering.tentative.https.html.ini
@@ -1,5 +1,4 @@
 [query-ordering.tentative.https.html]
-  expected: TIMEOUT
   [Requests appear in state in order made.]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/testing/web-platform/meta/web-locks/workers.tentative.https.html.ini b/testing/web-platform/meta/web-locks/workers.tentative.https.html.ini
index 6ba13a75c84c..0ac4af39b8ca 100644
--- a/testing/web-platform/meta/web-locks/workers.tentative.https.html.ini
+++ b/testing/web-platform/meta/web-locks/workers.tentative.https.html.ini
@@ -1,14 +1,13 @@
 [workers.tentative.https.html]
-  expected: ERROR
   [Window and Worker - shared mode]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Window and Worker - exclusive mode]
-    expected: NOTRUN
+    expected: FAIL
 
   [Worker and Worker - exclusive mode]
-    expected: NOTRUN
+    expected: FAIL
 
   [Terminated Worker - exclusive mode]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/testing/web-platform/tests/web-locks/clientids.tentative.https.html b/testing/web-platform/tests/web-locks/clientids.tentative.https.html
index 9ce4c4e9d184..02dabfa606ad 100644
--- a/testing/web-platform/tests/web-locks/clientids.tentative.https.html
+++ b/testing/web-platform/tests/web-locks/clientids.tentative.https.html
@@ -17,6 +17,7 @@ function nextMessage() {
 }
 
 promise_test(async t => {
+  assert_implements(navigator.locks);
   const iframe_url = 'resources/sw-controlled-iframe.html';
 
   // Register a service worker that will control an iframe.
diff --git a/testing/web-platform/tests/web-locks/frames.tentative.https.html b/testing/web-platform/tests/web-locks/frames.tentative.https.html
index 7d8383cffc18..84760f2f4057 100644
--- a/testing/web-platform/tests/web-locks/frames.tentative.https.html
+++ b/testing/web-platform/tests/web-locks/frames.tentative.https.html
@@ -10,6 +10,7 @@
 'use strict';
 
 promise_test(async t => {
+  assert_implements(navigator.locks);
   const res = uniqueName(t);
 
   const frame = await iframe('resources/iframe.html');
@@ -25,6 +26,7 @@ promise_test(async t => {
 }, 'Window and Frame - shared mode');
 
 promise_test(async t => {
+  assert_implements(navigator.locks);
   const res = uniqueName(t);
 
   const frame = await iframe('resources/iframe.html');
@@ -54,6 +56,7 @@ promise_test(async t => {
 }, 'Window and Frame - exclusive mode');
 
 promise_test(async t => {
+  assert_implements(navigator.locks);
   const res = uniqueName(t);
 
   const frame1 = await iframe('resources/iframe.html');
@@ -86,6 +89,7 @@ promise_test(async t => {
 }, 'Frame and Frame - exclusive mode');
 
 promise_test(async t => {
+  assert_implements(navigator.locks);
   const res = uniqueName(t);
 
   const frame = await iframe('resources/iframe.html');
@@ -114,6 +118,7 @@ promise_test(async t => {
 }, 'Terminated Frame with held lock');
 
 promise_test(async t => {
+  assert_implements(navigator.locks);
   const res = uniqueName(t);
 
   const frame = await iframe('resources/iframe.html');
@@ -142,6 +147,7 @@ promise_test(async t => {
 }, 'Navigated Frame with held lock');
 
 promise_test(async t => {
+  assert_implements(navigator.locks);
   const res = uniqueName(t);
 
   // frame1 requests and holds res - should be granted immediately.
@@ -190,6 +196,7 @@ promise_test(async t => {
 }, 'Navigated Frame with pending request');
 
 promise_test(async t => {
+  assert_implements(navigator.locks);
   const res = uniqueName(t);
 
   // frame1 requests and holds res - should be granted immediately.
diff --git a/testing/web-platform/tests/web-locks/query-ordering.tentative.https.html b/testing/web-platform/tests/web-locks/query-ordering.tentative.https.html
index bbbee3880b7c..172a1db87b7d 100644
--- a/testing/web-platform/tests/web-locks/query-ordering.tentative.https.html
+++ b/testing/web-platform/tests/web-locks/query-ordering.tentative.https.html
@@ -42,6 +42,7 @@ function nextMessage() {
 // distinguishable client_ids (otherwise it would not be possible to
 // distinguish the requests and thus impossible to verify ordering).
 promise_test(async testCase => {
+  assert_implements(navigator.locks);
   const resourceName = uniqueName(testCase);
 
   // Set up clients.
diff --git a/testing/web-platform/tests/web-locks/workers.tentative.https.html b/testing/web-platform/tests/web-locks/workers.tentative.https.html
index 04af72c8ad04..f1f11c603a4d 100644
--- a/testing/web-platform/tests/web-locks/workers.tentative.https.html
+++ b/testing/web-platform/tests/web-locks/workers.tentative.https.html
@@ -9,6 +9,7 @@
 'use strict';
 
 promise_test(async t => {
+  assert_implements(navigator.locks);
   const worker = new Worker('resources/worker.js');
   t.add_cleanup(() => { worker.terminate(); });
 
@@ -24,6 +25,7 @@ promise_test(async t => {
 }, 'Window and Worker - shared mode');
 
 promise_test(async t => {
+  assert_implements(navigator.locks);
   const worker = new Worker('resources/worker.js');
   t.add_cleanup(() => { worker.terminate(); });
 
@@ -55,6 +57,7 @@ promise_test(async t => {
 }, 'Window and Worker - exclusive mode');
 
 promise_test(async t => {
+  assert_implements(navigator.locks);
   const worker1 = new Worker('resources/worker.js');
   const worker2 = new Worker('resources/worker.js');
   t.add_cleanup(() => { worker1.terminate(); worker2.terminate(); });
@@ -87,6 +90,7 @@ promise_test(async t => {
 }, 'Worker and Worker - exclusive mode');
 
 promise_test(async t => {
+  assert_implements(navigator.locks);
   const worker = new Worker('resources/worker.js');
 
   const res = 'exclusive resource 3';