diff --git a/test/fixtures/wpt/interfaces/fedcm.idl b/test/fixtures/wpt/interfaces/fedcm.idl
index ba99f1174c8..443d3311a24 100644
--- a/test/fixtures/wpt/interfaces/fedcm.idl
+++ b/test/fixtures/wpt/interfaces/fedcm.idl
@@ -43,6 +43,7 @@ dictionary IdentityProviderRequestOptions : IdentityProviderConfig {
   USVString nonce;
   DOMString loginHint;
   DOMString domainHint;
+  any params;
 };
 
 dictionary IdentityProviderWellKnown {
diff --git a/test/fixtures/wpt/interfaces/invokers.tentative.idl b/test/fixtures/wpt/interfaces/invokers.tentative.idl
index 4724d7deb08..046a365939c 100644
--- a/test/fixtures/wpt/interfaces/invokers.tentative.idl
+++ b/test/fixtures/wpt/interfaces/invokers.tentative.idl
@@ -1,15 +1,15 @@
-interface mixin InvokerElement {
-  [CEReactions,Reflect=invoketarget] attribute Element? commandForElement;
-  [CEReactions,Reflect=invokeaction] attribute DOMString command;
+interface mixin CommandElement {
+  [CEReactions,Reflect=commandfor] attribute Element? commandForElement;
+  [CEReactions,Reflect=command] attribute DOMString command;
 };
 
 interface CommandEvent : Event {
     constructor(DOMString type, optional CommandEventInit eventInitDict = {});
-    readonly attribute Element? invoker;
+    readonly attribute Element? source;
     readonly attribute DOMString command;
 };
 
 dictionary CommandEventInit : EventInit {
-    Element? invoker = null;
+    Element? source = null;
     DOMString command = "";
 };
diff --git a/test/fixtures/wpt/interfaces/mediasession.idl b/test/fixtures/wpt/interfaces/mediasession.idl
index 5c6942be5a0..9c050b0efdf 100644
--- a/test/fixtures/wpt/interfaces/mediasession.idl
+++ b/test/fixtures/wpt/interfaces/mediasession.idl
@@ -59,7 +59,7 @@ interface MediaMetadata {
   attribute DOMString title;
   attribute DOMString artist;
   attribute DOMString album;
-  attribute FrozenArray<MediaImage> artwork;
+  attribute FrozenArray<object> artwork;
   [SameObject] readonly attribute FrozenArray<ChapterInformation> chapterInfo;
 };
 
diff --git a/test/fixtures/wpt/interfaces/webaudio.idl b/test/fixtures/wpt/interfaces/webaudio.idl
index 74aab7e2362..d14eb96820f 100644
--- a/test/fixtures/wpt/interfaces/webaudio.idl
+++ b/test/fixtures/wpt/interfaces/webaudio.idl
@@ -1,7 +1,7 @@
 // GENERATED CONTENT - DO NOT EDIT
 // Content was automatically extracted by Reffy into webref
 // (https://github.com/w3c/webref)
-// Source: Web Audio API (https://webaudio.github.io/web-audio-api/)
+// Source: Web Audio API 1.1 (https://webaudio.github.io/web-audio-api/)
 
 enum AudioContextState {
     "suspended",
@@ -33,8 +33,8 @@ interface BaseAudioContext : EventTarget {
     AnalyserNode createAnalyser ();
     BiquadFilterNode createBiquadFilter ();
     AudioBuffer createBuffer (unsigned long numberOfChannels,
-                              unsigned long length,
-                              float sampleRate);
+                                unsigned long length,
+                                float sampleRate);
     AudioBufferSourceNode createBufferSource ();
     ChannelMergerNode createChannelMerger (optional unsigned long numberOfInputs = 6);
     ChannelSplitterNode createChannelSplitter (
@@ -45,12 +45,12 @@ interface BaseAudioContext : EventTarget {
     DynamicsCompressorNode createDynamicsCompressor ();
     GainNode createGain ();
     IIRFilterNode createIIRFilter (sequence<double> feedforward,
-                                   sequence<double> feedback);
+                                    sequence<double> feedback);
     OscillatorNode createOscillator ();
     PannerNode createPanner ();
     PeriodicWave createPeriodicWave (sequence<float> real,
-                                     sequence<float> imag,
-                                     optional PeriodicWaveConstraints constraints = {});
+                                        sequence<float> imag,
+                                        optional PeriodicWaveConstraints constraints = {});
     ScriptProcessorNode createScriptProcessor(
         optional unsigned long bufferSize = 0,
         optional unsigned long numberOfInputChannels = 2,
diff --git a/test/fixtures/wpt/interfaces/webcodecs.idl b/test/fixtures/wpt/interfaces/webcodecs.idl
index 52731257f1f..98476281218 100644
--- a/test/fixtures/wpt/interfaces/webcodecs.idl
+++ b/test/fixtures/wpt/interfaces/webcodecs.idl
@@ -340,7 +340,7 @@ dictionary VideoFrameInit {
   AlphaOption alpha = "keep";
 
   // Default matches image. May be used to efficiently crop. Will trigger
-  // new computation of displayWidth and displayHeight using image’s pixel
+  // new computation of displayWidth and displayHeight using image's pixel
   // aspect ratio unless an explicit displayWidth and displayHeight are given.
   DOMRectInit visibleRect;
 
diff --git a/test/fixtures/wpt/interfaces/webgpu.idl b/test/fixtures/wpt/interfaces/webgpu.idl
index 421685c7a8f..58e43d02f5e 100644
--- a/test/fixtures/wpt/interfaces/webgpu.idl
+++ b/test/fixtures/wpt/interfaces/webgpu.idl
@@ -119,6 +119,7 @@ enum GPUFeatureName {
     "rg11b10ufloat-renderable",
     "bgra8unorm-storage",
     "float32-filterable",
+    "float32-blendable",
     "clip-distances",
     "dual-source-blending",
 };
diff --git a/test/fixtures/wpt/interfaces/webtransport.idl b/test/fixtures/wpt/interfaces/webtransport.idl
index 6e9d1036736..24fe5b7e61b 100644
--- a/test/fixtures/wpt/interfaces/webtransport.idl
+++ b/test/fixtures/wpt/interfaces/webtransport.idl
@@ -96,7 +96,8 @@ dictionary WebTransportConnectionStats {
   required DOMHighResTimeStamp rttVariation;
   required DOMHighResTimeStamp minRtt;
   required WebTransportDatagramStats datagrams;
-  required unsigned long long? estimatedSendRate;
+  unsigned long long? estimatedSendRate = null;
+  boolean atSendCapacity = false;
 };
 
 dictionary WebTransportDatagramStats {
diff --git a/test/fixtures/wpt/interfaces/webusb.idl b/test/fixtures/wpt/interfaces/webusb.idl
index 3b362d2351d..d6484db3e88 100644
--- a/test/fixtures/wpt/interfaces/webusb.idl
+++ b/test/fixtures/wpt/interfaces/webusb.idl
@@ -40,7 +40,7 @@ dictionary USBConnectionEventInit : EventInit {
 };
 
 [
-  Exposed=(DedicatedWorker,SharedWorker,Window),
+  Exposed=(Worker,Window),
   SecureContext
 ]
 interface USBConnectionEvent : Event {
@@ -55,7 +55,7 @@ enum USBTransferStatus {
 };
 
 [
-  Exposed=(DedicatedWorker,SharedWorker,Window),
+  Exposed=(Worker,Window),
   SecureContext
 ]
 interface USBInTransferResult {
@@ -65,7 +65,7 @@ interface USBInTransferResult {
 };
 
 [
-  Exposed=(DedicatedWorker,SharedWorker,Window),
+  Exposed=(Worker,Window),
   SecureContext
 ]
 interface USBOutTransferResult {
@@ -75,7 +75,7 @@ interface USBOutTransferResult {
 };
 
 [
-  Exposed=(DedicatedWorker,SharedWorker,Window),
+  Exposed=(Worker,Window),
   SecureContext
 ]
 interface USBIsochronousInTransferPacket {
@@ -85,7 +85,7 @@ interface USBIsochronousInTransferPacket {
 };
 
 [
-  Exposed=(DedicatedWorker,SharedWorker,Window),
+  Exposed=(Worker,Window),
   SecureContext
 ]
 interface USBIsochronousInTransferResult {
@@ -95,7 +95,7 @@ interface USBIsochronousInTransferResult {
 };
 
 [
-  Exposed=(DedicatedWorker,SharedWorker,Window),
+  Exposed=(Worker,Window),
   SecureContext
 ]
 interface USBIsochronousOutTransferPacket {
@@ -105,7 +105,7 @@ interface USBIsochronousOutTransferPacket {
 };
 
 [
-  Exposed=(DedicatedWorker,SharedWorker,Window),
+  Exposed=(Worker,Window),
   SecureContext
 ]
 interface USBIsochronousOutTransferResult {
@@ -113,7 +113,7 @@ interface USBIsochronousOutTransferResult {
   readonly attribute FrozenArray<USBIsochronousOutTransferPacket> packets;
 };
 
-[Exposed=(DedicatedWorker,SharedWorker,Window), SecureContext]
+[Exposed=(Worker,Window), SecureContext]
 interface USBDevice {
   readonly attribute octet usbVersionMajor;
   readonly attribute octet usbVersionMinor;
@@ -171,7 +171,7 @@ dictionary USBControlTransferParameters {
 };
 
 [
-  Exposed=(DedicatedWorker,SharedWorker,Window),
+  Exposed=(Worker,Window),
   SecureContext
 ]
 interface USBConfiguration {
@@ -182,7 +182,7 @@ interface USBConfiguration {
 };
 
 [
-  Exposed=(DedicatedWorker,SharedWorker,Window),
+  Exposed=(Worker,Window),
   SecureContext
 ]
 interface USBInterface {
@@ -194,7 +194,7 @@ interface USBInterface {
 };
 
 [
-  Exposed=(DedicatedWorker,SharedWorker,Window),
+  Exposed=(Worker,Window),
   SecureContext
 ]
 interface USBAlternateInterface {
@@ -219,7 +219,7 @@ enum USBEndpointType {
 };
 
 [
-  Exposed=(DedicatedWorker,SharedWorker,Window),
+  Exposed=(Worker,Window),
   SecureContext
 ]
 interface USBEndpoint {
@@ -252,7 +252,7 @@ dictionary USBPermissionStorage {
   sequence<AllowedUSBDevice> allowedDevices = [];
 };
 
-[Exposed=(DedicatedWorker,SharedWorker,Window)]
+[Exposed=(Worker,Window)]
 interface USBPermissionResult : PermissionStatus {
   attribute FrozenArray<USBDevice> devices;
 };
diff --git a/test/fixtures/wpt/service-workers/service-worker/tentative/static-router/static-router-resource-timing.https.html b/test/fixtures/wpt/service-workers/service-worker/tentative/static-router/static-router-resource-timing.https.html
index 74d84eb3c9f..e32436da41b 100644
--- a/test/fixtures/wpt/service-workers/service-worker/tentative/static-router/static-router-resource-timing.https.html
+++ b/test/fixtures/wpt/service-workers/service-worker/tentative/static-router/static-router-resource-timing.https.html
@@ -63,6 +63,7 @@
       if (entry.workerFinalSourceType === 'cache') {
         assert_equals(entry.fetchStart, entry.responseStart, description);
         assert_less_than_equal(entry.workerCacheLookupStart, entry.responseStart, description);
+        assert_equals(entry.deliveryType, 'cache-storage', description);
       } else {
         assert_less_than_equal(entry.workerCacheLookupStart, entry.fetchStart, description);
       }
diff --git a/test/fixtures/wpt/storage/quotachange-in-detached-iframe.tentative.https.html b/test/fixtures/wpt/storage/quotachange-in-detached-iframe.tentative.https.html
deleted file mode 100644
index 123af50e3ce..00000000000
--- a/test/fixtures/wpt/storage/quotachange-in-detached-iframe.tentative.https.html
+++ /dev/null
@@ -1,21 +0,0 @@
-<!doctype html>
-<meta charset="utf-8">
-<title>quotachange event on DOMWindow of detached iframe</title>
-<link rel="author" href="jarrydg@chromium.org" title="Jarryd">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<iframe id="iframe"></iframe>
-<script>
-'use strict';
-
-test(t => {
-  const iframe = document.getElementById('iframe');
-  const frameWindow = iframe.contentWindow;
-  const storageManager = frameWindow.navigator.storage;
-
-  iframe.parentNode.removeChild(iframe);
-  const emptyListener = () => {};
-  storageManager.addEventListener('quotachange', emptyListener);
-  storageManager.removeEventListener('quotachange', emptyListener);
-}, "Add quotachange listener on detached iframe.");
-</script>
diff --git a/test/fixtures/wpt/xhr/formdata/constructor-submitter-coordinate.html b/test/fixtures/wpt/xhr/formdata/constructor-submitter-coordinate.html
index 992f64b7217..b7bf128bd12 100644
--- a/test/fixtures/wpt/xhr/formdata/constructor-submitter-coordinate.html
+++ b/test/fixtures/wpt/xhr/formdata/constructor-submitter-coordinate.html
@@ -1,18 +1,21 @@
 <!DOCTYPE html>
 <meta charset='utf-8'>
+<meta name=viewport content='width=device-width,initial-scale=1'>
 <link rel='help' href='https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#constructing-the-form-data-set'>
 <link ref='help' href='https://xhr.spec.whatwg.org/#dom-formdata'>
 <script src='/resources/testharness.js'></script>
 <script src='/resources/testharnessreport.js'></script>
 
 <form>
-  <input type=image src='/media/1x1-green.png'></button>
+  <input type=image src='/images/100px-green-rect.svg'>
 </form>
 
 <script>
 "use strict";
 
-test(() => {
+promise_test(async () => {
+  await new Promise(r => window.addEventListener("load", r));
+
   const form = document.querySelector("form");
   const submitter = form.querySelector("input[type=image]");
 
@@ -23,14 +26,14 @@
   });
 
   const domRect = submitter.getBoundingClientRect();
+  const clientX = Math.round((domRect.left + domRect.right) / 7);
+  const clientY = Math.round((domRect.top + domRect.bottom) / 4);
+
   submitter.dispatchEvent(
-    new MouseEvent("click", {
-      clientX: Math.round(domRect.x) + 1,
-      clientY: Math.round(domRect.y) + 2
-    })
+    new MouseEvent("click", {clientX, clientY})
   );
 
-  assert_equals(formData?.get("x"), "1");
-  assert_equals(formData?.get("y"), "2");
+  assert_equals(formData?.get("x"), "23");
+  assert_equals(formData?.get("y"), "46");
 }, "The constructed FormData object should contain correct entries for Image Button submitter's dispatched coordinate");
 </script>
diff --git a/test/fixtures/wpt/xhr/formdata/submitter-coordinate-value.html b/test/fixtures/wpt/xhr/formdata/submitter-coordinate-value.html
new file mode 100644
index 00000000000..69bea0ac3f9
--- /dev/null
+++ b/test/fixtures/wpt/xhr/formdata/submitter-coordinate-value.html
@@ -0,0 +1,55 @@
+<!doctype html>
+<meta charset="utf-8">
+<meta name=viewport content="width=device-width,initial-scale=1">
+<title>Test image button coordinates</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/input.html#image-button-state-(type=image)">
+<link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=282266">
+<link rel="author" title="Zach Hoffman" href="mailto:zach@zrhoffman.net">
+<form id="myForm" onsubmit="return false;">
+  <input id="myImage" name="myImage" type="image" src="/images/100px-green-rect.svg">
+</form>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+promise_test(async t => {
+  await new Promise(r => window.addEventListener("load", r));
+
+  const xCoordinates = [];
+  const yCoordinates = [];
+
+  let formData;
+  myForm.addEventListener("submit", t.step_func(e => {
+    e.preventDefault();
+    formData = new FormData(myForm, myImage);
+    xCoordinates.push(formData.get("myImage.x"));
+    yCoordinates.push(formData.get("myImage.y"));
+  }));
+
+  await test_driver.click(myImage);
+
+  const [clientX, clientY] = getInViewCenterPoint(myImage.getBoundingClientRect());
+  const mouseEvent = new MouseEvent("click", {clientX, clientY});
+  myImage.dispatchEvent(mouseEvent);
+
+  assert_equals(xCoordinates.length, 2, "there should be 2 X coordinates");
+  assert_equals(yCoordinates.length, 2, "there should be 2 Y coordinates");
+  assert_equals(xCoordinates[1], xCoordinates[0], "dispatched event X coordinate should match user intention X coordinate");
+  assert_equals(yCoordinates[1], yCoordinates[0], "dispatched event Y coordinate should match user intention Y coordinate");
+}, "dispatched event coordinates should match user intention coordinates")
+
+// Private function from testdriver.js.
+function getInViewCenterPoint(rect) {
+  var left = Math.max(0, rect.left);
+  var right = Math.min(window.innerWidth, rect.right);
+  var top = Math.max(0, rect.top);
+  var bottom = Math.min(window.innerHeight, rect.bottom);
+
+  var x = 0.5 * (left + right);
+  var y = 0.5 * (top + bottom);
+
+  return [x, y];
+}
+</script>