diff --git a/html/semantics/popovers/idlharness.tentative.html b/html/semantics/popovers/idlharness.tentative.html
index 1cab891261cfd4..d1a258bb4ad3ac 100644
--- a/html/semantics/popovers/idlharness.tentative.html
+++ b/html/semantics/popovers/idlharness.tentative.html
@@ -41,12 +41,12 @@
         'document.getElementById("b3")',
       ],
       BeforeToggleEvent: [
-        'new ToggleEvent("beforetoggle")',
-        'new ToggleEvent("beforetoggle", {oldState: "open"})',
-        'new ToggleEvent("beforetoggle", {oldState: "open",newState: "open"})',
-        'new ToggleEvent("toggle")',
-        'new ToggleEvent("toggle", {oldState: "open"})',
-        'new ToggleEvent("toggle", {oldState: "open",newState: "open"})',
+        'new PopoverToggleEvent("beforetoggle")',
+        'new PopoverToggleEvent("beforetoggle", {currentState: "open"})',
+        'new PopoverToggleEvent("beforetoggle", {currentState: "open",newState: "open"})',
+        'new PopoverToggleEvent("aftertoggle")',
+        'new PopoverToggleEvent("aftertoggle", {currentState: "open"})',
+        'new PopoverToggleEvent("aftertoggle", {currentState: "open",newState: "open"})',
       ],
     });
   }
diff --git a/html/semantics/popovers/popover-events.tentative.html b/html/semantics/popovers/popover-events.tentative.html
index b299424570024c..b96a0f5a53f489 100644
--- a/html/semantics/popovers/popover-events.tentative.html
+++ b/html/semantics/popovers/popover-events.tentative.html
@@ -10,13 +10,6 @@
 <div popover>Popover</div>
 
 <script>
-function getPopoverAndSignal(t) {
-  const popover = document.querySelector('[popover]');
-  const controller = new AbortController();
-  const signal = controller.signal;
-  t.add_cleanup(() => controller.abort());
-  return {popover, signal};
-}
 window.onload = () => {
   for(const method of ["listener","attribute"]) {
     promise_test(async t => {
@@ -29,48 +22,52 @@
       function listener(e) {
         if (e.type === "beforetoggle") {
           if (e.newState === "open") {
-            ++showCount;
-            assert_equals(e.oldState,"closed",'The "beforetoggle" event should be fired before the popover is open');
+            assert_equals(e.currentState,"closed",'The "beforetoggle" event should be fired before the popover is open');
             assert_true(e.target.matches(':closed'),'The popover should be in the :closed state when the opening event fires.');
             assert_false(e.target.matches(':open'),'The popover should *not* be in the :open state when the opening event fires.');
+            ++showCount;
           } else {
-            ++hideCount;
             assert_equals(e.newState,"closed",'Popover toggleevent states should be "open" and "closed"');
-            assert_equals(e.oldState,"open",'The "beforetoggle" event should be fired before the popover is closed')
+            assert_equals(e.currentState,"open",'The "beforetoggle" event should be fired before the popover is closed')
             assert_true(e.target.matches(':open'),'The popover should be in the :open state when the hiding event fires.');
             assert_false(e.target.matches(':closed'),'The popover should *not* be in the :closed state when the hiding event fires.');
+            ++hideCount;
           }
         } else {
-          assert_equals(e.type,"toggle",'Popover events should be "beforetoggle" and "toggle"')
+          assert_equals(e.type,"aftertoggle",'Popover events should be "beforetoggle" and "aftertoggle"')
           if (e.newState === "open") {
-            ++afterShowCount;
+            assert_equals(e.currentState,"open",'Aftertoggle should be fired after the popover is open');
             if (document.body.contains(e.target)) {
               assert_true(e.target.matches(':open'),'The popover should be in the :open state when the after opening event fires.');
               assert_false(e.target.matches(':closed'),'The popover should *not* be in the :closed state when the after opening event fires.');
             }
+            ++afterShowCount;
           } else {
-            ++afterHideCount;
             assert_equals(e.newState,"closed",'Popover toggleevent states should be "open" and "closed"');
+            assert_equals(e.currentState,"closed",'Aftertoggle should be fired after the popover is closed');
             assert_true(e.target.matches(':closed'),'The popover should be in the :closed state when the after hiding event fires.');
             assert_false(e.target.matches(':open'),'The popover should *not* be in the :open state when the after hiding event fires.');
+            ++afterHideCount;
           }
-          e.preventDefault(); // "toggle" should not be cancelable.
+          e.preventDefault(); // "aftertoggle" should not be cancelable.
         }
       };
       switch (method) {
         case "listener":
-          const {signal} = getPopoverAndSignal(t);
+          const controller = new AbortController();
+          const signal = controller.signal;
+          t.add_cleanup(() => controller.abort());
           // These events bubble.
           document.addEventListener('beforetoggle', listener, {signal});
-          document.addEventListener('toggle', listener, {signal});
+          document.addEventListener('aftertoggle', listener, {signal});
           break;
         case "attribute":
           assert_false(popover.hasAttribute('onbeforetoggle'));
           t.add_cleanup(() => popover.removeAttribute('onbeforetoggle'));
           popover.onbeforetoggle = listener;
-          assert_false(popover.hasAttribute('ontoggle'));
-          t.add_cleanup(() => popover.removeAttribute('ontoggle'));
-          popover.ontoggle = listener;
+          assert_false(popover.hasAttribute('onaftertoggle'));
+          t.add_cleanup(() => popover.removeAttribute('onaftertoggle'));
+          popover.onaftertoggle = listener;
           break;
         default: assert_unreached();
       }
@@ -85,7 +82,7 @@
       assert_equals(0,afterShowCount);
       assert_equals(0,afterHideCount);
       await waitForRender();
-      assert_equals(1,afterShowCount,'toggle show is fired asynchronously');
+      assert_equals(1,afterShowCount,'aftertoggle show is fired asynchronously');
       assert_equals(0,afterHideCount);
       assert_true(popover.matches(':open'));
       popover.hidePopover();
@@ -96,7 +93,7 @@
       assert_equals(0,afterHideCount);
       await waitForRender();
       assert_equals(1,afterShowCount);
-      assert_equals(1,afterHideCount,'toggle hide is fired asynchronously');
+      assert_equals(1,afterHideCount,'aftertoggle hide is fired asynchronously');
       // No additional events
       await waitForRender();
       await waitForRender();
@@ -109,7 +106,10 @@
   }
 
   promise_test(async t => {
-    const {popover,signal} = getPopoverAndSignal(t);
+    const popover = document.querySelector('[popover]');
+    const controller = new AbortController();
+    const signal = controller.signal;
+    t.add_cleanup(() => controller.abort());
     let cancel = true;
     popover.addEventListener('beforetoggle',(e) => {
       if (e.newState !== "open")
@@ -128,7 +128,10 @@
   }, 'The "beforetoggle" event is cancelable for the "opening" transition');
 
   promise_test(async t => {
-    const {popover,signal} = getPopoverAndSignal(t);
+    const popover = document.querySelector('[popover]');
+    const controller = new AbortController();
+    const signal = controller.signal;
+    t.add_cleanup(() => {controller.abort();});
     popover.addEventListener('beforetoggle',(e) => {
       assert_not_equals(e.newState,"closed",'The "beforetoggle" event was fired for the closing transition');
     }, {signal});
@@ -141,74 +144,5 @@
     await waitForRender(); // Check for async events also
     assert_false(popover.matches(':open'));
   }, 'The "beforetoggle" event is not fired for element removal');
-
-  promise_test(async t => {
-    const {popover,signal} = getPopoverAndSignal(t);
-    let events;
-    function resetEvents() {
-      events = {
-        singleShow: false,
-        singleHide: false,
-        coalescedShow: false,
-        coalescedHide: false,
-      };
-    }
-    function setEvent(type) {
-      assert_equals(events[type],false,'event repeated');
-      events[type] = true;
-    }
-    function assertOnly(type,msg) {
-      Object.keys(events).forEach(val => {
-        assert_equals(events[val],val===type,`${msg} (${val})`);
-      });
-    }
-    popover.addEventListener('toggle',(e) => {
-      switch (e.newState) {
-        case "open":
-          switch (e.oldState) {
-            case "open": setEvent('coalescedShow'); break;
-            case "closed": setEvent('singleShow'); break;
-            default: assert_unreached();
-          }
-          break;
-        case "closed":
-          switch (e.oldState) {
-            case "closed": setEvent('coalescedHide'); break;
-            case "open": setEvent('singleHide'); break;
-            default: assert_unreached();
-          }
-          break;
-        default: assert_unreached();
-      }
-    }, {signal});
-
-    resetEvents();
-    assertOnly('none');
-    assert_false(popover.matches(':open'));
-    popover.showPopover();
-    await waitForRender();
-    assert_true(popover.matches(':open'));
-    assertOnly('singleShow','Single event should have been fired, which is a "show"');
-
-    resetEvents();
-    popover.hidePopover();
-    popover.showPopover(); // Immediate re-show
-    await waitForRender();
-    assert_true(popover.matches(':open'));
-    assertOnly('coalescedShow','Single coalesced event should have been fired, which is a "show"');
-
-    resetEvents();
-    popover.hidePopover();
-    await waitForRender();
-    assertOnly('singleHide','Single event should have been fired, which is a "hide"');
-    assert_false(popover.matches(':open'));
-
-    resetEvents();
-    popover.showPopover();
-    popover.hidePopover(); // Immediate re-hide
-    await waitForRender();
-    assertOnly('coalescedHide','Single coalesced event should have been fired, which is a "hide"');
-    assert_false(popover.matches(':open'));
-  }, 'The "toggle" event is coalesced');
 };
 </script>
diff --git a/html/semantics/popovers/toggleevent-interface.tentative.html b/html/semantics/popovers/toggleevent-interface.tentative.html
index 45709458b00c46..4d437b0c0ad523 100644
--- a/html/semantics/popovers/toggleevent-interface.tentative.html
+++ b/html/semantics/popovers/toggleevent-interface.tentative.html
@@ -7,200 +7,200 @@
 
 <script>
 test(function() {
-  var event = new ToggleEvent("");
-  assert_true(event instanceof window.ToggleEvent);
-}, "the event is an instance of ToggleEvent");
+  var event = new PopoverToggleEvent("");
+  assert_true(event instanceof window.PopoverToggleEvent);
+}, "the event is an instance of PopoverToggleEvent");
 
 test(function() {
-  var event = new ToggleEvent("");
+  var event = new PopoverToggleEvent("");
   assert_true(event instanceof window.Event);
 }, "the event inherts from Event");
 
 test(function() {
   assert_throws_js(TypeError, function() {
-    new ToggleEvent();
+    new PopoverToggleEvent();
   }, 'First argument (type) is required, so was expecting a TypeError.');
 }, 'Missing type argument');
 
 test(function() {
-  var event = new ToggleEvent("test");
+  var event = new PopoverToggleEvent("test");
   assert_equals(event.type, "test");
 }, "type argument is string");
 
 test(function() {
-  var event = new ToggleEvent(null);
+  var event = new PopoverToggleEvent(null);
   assert_equals(event.type, "null");
 }, "type argument is null");
 
 test(function() {
-  var event = new ToggleEvent(undefined);
+  var event = new PopoverToggleEvent(undefined);
   assert_equals(event.type, "undefined");
 }, "event type set to undefined");
 
 test(function() {
-  var event = new ToggleEvent("test");
-  assert_equals(event.oldState, "");
-}, "oldState has default value of empty string");
+  var event = new PopoverToggleEvent("test");
+  assert_equals(event.currentState, "");
+}, "currentState has default value of empty string");
 
 test(function() {
-  var event = new ToggleEvent("test");
-  assert_readonly(event, "oldState", "readonly attribute value");
-}, "oldState is readonly");
+  var event = new PopoverToggleEvent("test");
+  assert_readonly(event, "currentState", "readonly attribute value");
+}, "currentState is readonly");
 
 test(function() {
-  var event = new ToggleEvent("test");
+  var event = new PopoverToggleEvent("test");
   assert_equals(event.newState, "");
 }, "newState has default value of empty string");
 
 test(function() {
-  var event = new ToggleEvent("test");
+  var event = new PopoverToggleEvent("test");
   assert_readonly(event, "newState", "readonly attribute value");
 }, "newState is readonly");
 
 test(function() {
-  var event = new ToggleEvent("test", null);
-  assert_equals(event.oldState, "");
+  var event = new PopoverToggleEvent("test", null);
+  assert_equals(event.currentState, "");
   assert_equals(event.newState, "");
-}, "ToggleEventInit argument is null");
+}, "PopoverToggleEventInit argument is null");
 
 test(function() {
-  var event = new ToggleEvent("test", undefined);
-  assert_equals(event.oldState, "");
+  var event = new PopoverToggleEvent("test", undefined);
+  assert_equals(event.currentState, "");
   assert_equals(event.newState, "");
-}, "ToggleEventInit argument is undefined");
+}, "PopoverToggleEventInit argument is undefined");
 
 test(function() {
-  var event = new ToggleEvent("test", {});
-  assert_equals(event.oldState, "");
+  var event = new PopoverToggleEvent("test", {});
+  assert_equals(event.currentState, "");
   assert_equals(event.newState, "");
-}, "ToggleEventInit argument is empty dictionary");
+}, "PopoverToggleEventInit argument is empty dictionary");
 
 test(function() {
-  var event = new ToggleEvent("test", {oldState: "sample"});
-  assert_equals(event.oldState, "sample");
-}, "oldState set to 'sample'");
+  var event = new PopoverToggleEvent("test", {currentState: "sample"});
+  assert_equals(event.currentState, "sample");
+}, "currentState set to 'sample'");
 
 test(function() {
-  var event = new ToggleEvent("test", {oldState: undefined});
-  assert_equals(event.oldState, "");
-}, "oldState set to undefined");
+  var event = new PopoverToggleEvent("test", {currentState: undefined});
+  assert_equals(event.currentState, "");
+}, "currentState set to undefined");
 
 test(function() {
-  var event = new ToggleEvent("test", {oldState: null});
-  assert_equals(event.oldState, "null");
-}, "oldState set to null");
+  var event = new PopoverToggleEvent("test", {currentState: null});
+  assert_equals(event.currentState, "null");
+}, "currentState set to null");
 
 test(function() {
-  var event = new ToggleEvent("test", {oldState: false});
-  assert_equals(event.oldState, "false");
-}, "oldState set to false");
+  var event = new PopoverToggleEvent("test", {currentState: false});
+  assert_equals(event.currentState, "false");
+}, "currentState set to false");
 
 test(function() {
-  var event = new ToggleEvent("test", {oldState: true});
-  assert_equals(event.oldState, "true");
-}, "oldState set to true");
+  var event = new PopoverToggleEvent("test", {currentState: true});
+  assert_equals(event.currentState, "true");
+}, "currentState set to true");
 
 test(function() {
-  var event = new ToggleEvent("test", {oldState: 0.5});
-  assert_equals(event.oldState, "0.5");
-}, "oldState set to a number");
+  var event = new PopoverToggleEvent("test", {currentState: 0.5});
+  assert_equals(event.currentState, "0.5");
+}, "currentState set to a number");
 
 test(function() {
-  var event = new ToggleEvent("test", {oldState: []});
-  assert_equals(event.oldState, "");
-}, "oldState set to []");
+  var event = new PopoverToggleEvent("test", {currentState: []});
+  assert_equals(event.currentState, "");
+}, "currentState set to []");
 
 test(function() {
-  var event = new ToggleEvent("test", {oldState: [1, 2, 3]});
-  assert_equals(event.oldState, "1,2,3");
-}, "oldState set to [1, 2, 3]");
+  var event = new PopoverToggleEvent("test", {currentState: [1, 2, 3]});
+  assert_equals(event.currentState, "1,2,3");
+}, "currentState set to [1, 2, 3]");
 
 test(function() {
-  var event = new ToggleEvent("test", {oldState: {sample: 0.5}});
-  assert_equals(event.oldState, "[object Object]");
-}, "oldState set to an object");
+  var event = new PopoverToggleEvent("test", {currentState: {sample: 0.5}});
+  assert_equals(event.currentState, "[object Object]");
+}, "currentState set to an object");
 
 test(function() {
-  var event = new ToggleEvent("test",
-      {oldState: {valueOf: function () { return 'sample'; }}});
-  assert_equals(event.oldState, "[object Object]");
-}, "oldState set to an object with a valueOf function");
+  var event = new PopoverToggleEvent("test",
+      {currentState: {valueOf: function () { return 'sample'; }}});
+  assert_equals(event.currentState, "[object Object]");
+}, "currentState set to an object with a valueOf function");
 
 test(function() {
-  var eventInit = {oldState: "sample",newState: "sample2"};
-  var event = new ToggleEvent("test", eventInit);
-  assert_equals(event.oldState, "sample");
+  var eventInit = {currentState: "sample",newState: "sample2"};
+  var event = new PopoverToggleEvent("test", eventInit);
+  assert_equals(event.currentState, "sample");
   assert_equals(event.newState, "sample2");
-}, "ToggleEventInit properties set value");
+}, "PopoverToggleEventInit properties set value");
 
 test(function() {
-  var eventInit = {oldState: "open",newState: "closed"};
-  var event = new ToggleEvent("beforetoggle", eventInit);
-  assert_equals(event.oldState, "open");
+  var eventInit = {currentState: "open",newState: "closed"};
+  var event = new PopoverToggleEvent("beforetoggle", eventInit);
+  assert_equals(event.currentState, "open");
   assert_equals(event.newState, "closed");
-}, "ToggleEventInit properties set value 2");
+}, "PopoverToggleEventInit properties set value 2");
 
 test(function() {
-  var eventInit = {oldState: "closed",newState: "open"};
-  var event = new ToggleEvent("toggle", eventInit);
-  assert_equals(event.oldState, "closed");
+  var eventInit = {currentState: "closed",newState: "open"};
+  var event = new PopoverToggleEvent("aftertoggle", eventInit);
+  assert_equals(event.currentState, "closed");
   assert_equals(event.newState, "open");
-}, "ToggleEventInit properties set value 3");
+}, "PopoverToggleEventInit properties set value 3");
 
 test(function() {
-  var eventInit = {oldState: "open",newState: "open"};
-  var event = new ToggleEvent("beforetoggle", eventInit);
-  assert_equals(event.oldState, "open");
+  var eventInit = {currentState: "open",newState: "open"};
+  var event = new PopoverToggleEvent("beforetoggle", eventInit);
+  assert_equals(event.currentState, "open");
   assert_equals(event.newState, "open");
-}, "ToggleEventInit properties set value 4");
+}, "PopoverToggleEventInit properties set value 4");
 
 test(function() {
-  var event = new ToggleEvent("test", {newState: "sample"});
+  var event = new PopoverToggleEvent("test", {newState: "sample"});
   assert_equals(event.newState, "sample");
 }, "newState set to 'sample'");
 
 test(function() {
-  var event = new ToggleEvent("test", {newState: undefined});
+  var event = new PopoverToggleEvent("test", {newState: undefined});
   assert_equals(event.newState, "");
 }, "newState set to undefined");
 
 test(function() {
-  var event = new ToggleEvent("test", {newState: null});
+  var event = new PopoverToggleEvent("test", {newState: null});
   assert_equals(event.newState, "null");
 }, "newState set to null");
 
 test(function() {
-  var event = new ToggleEvent("test", {newState: false});
+  var event = new PopoverToggleEvent("test", {newState: false});
   assert_equals(event.newState, "false");
 }, "newState set to false");
 
 test(function() {
-  var event = new ToggleEvent("test", {newState: true});
+  var event = new PopoverToggleEvent("test", {newState: true});
   assert_equals(event.newState, "true");
 }, "newState set to true");
 
 test(function() {
-  var event = new ToggleEvent("test", {newState: 0.5});
+  var event = new PopoverToggleEvent("test", {newState: 0.5});
   assert_equals(event.newState, "0.5");
 }, "newState set to a number");
 
 test(function() {
-  var event = new ToggleEvent("test", {newState: []});
+  var event = new PopoverToggleEvent("test", {newState: []});
   assert_equals(event.newState, "");
 }, "newState set to []");
 
 test(function() {
-  var event = new ToggleEvent("test", {newState: [1, 2, 3]});
+  var event = new PopoverToggleEvent("test", {newState: [1, 2, 3]});
   assert_equals(event.newState, "1,2,3");
 }, "newState set to [1, 2, 3]");
 
 test(function() {
-  var event = new ToggleEvent("test", {newState: {sample: 0.5}});
+  var event = new PopoverToggleEvent("test", {newState: {sample: 0.5}});
   assert_equals(event.newState, "[object Object]");
 }, "newState set to an object");
 
 test(function() {
-  var event = new ToggleEvent("test",
+  var event = new PopoverToggleEvent("test",
       {newState: {valueOf: function () { return 'sample'; }}});
   assert_equals(event.newState, "[object Object]");
 }, "newState set to an object with a valueOf function");
diff --git a/interfaces/popover.tentative.idl b/interfaces/popover.tentative.idl
index 4e8c85f7dacb14..bf23c7641d94e8 100644
--- a/interfaces/popover.tentative.idl
+++ b/interfaces/popover.tentative.idl
@@ -13,13 +13,13 @@ interface mixin PopoverTargetElement {
 HTMLInputElement includes PopoverTargetElement;
 HTMLButtonElement includes PopoverTargetElement;
 
-interface ToggleEvent : Event {
-    constructor(DOMString type, optional ToggleEventInit eventInitDict = {});
-    readonly attribute DOMString oldState;
+interface PopoverToggleEvent : Event {
+    constructor(DOMString type, optional PopoverToggleEventInit eventInitDict = {});
+    readonly attribute DOMString currentState;
     readonly attribute DOMString newState;
 };
 
-dictionary ToggleEventInit : EventInit {
-    DOMString oldState = "";
+dictionary PopoverToggleEventInit : EventInit {
+    DOMString currentState = "";
     DOMString newState = "";
 };