diff --git a/testing/web-platform/tests/inert/frame/button.html b/testing/web-platform/tests/inert/frame/button.html
deleted file mode 100644
index 5867c758142c6..0000000000000
--- a/testing/web-platform/tests/inert/frame/button.html
+++ /dev/null
@@ -1,36 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<style>
-body {
-  overflow: hidden;
-}
-
-button#background {
-  position: absolute;
-  top: 0;
-  left: 0;
-  width: 150px;
-  height: 40px;
-  line-height: 53px;
-}
-
-button.clicked {
-  background-color: red;
-}
-
-button.clicked::after {
-  content: " (clicked)";
-}
-
-</style>
-</head>
-<body>
-  <button id="background">background</button>
-<script>
-document.body.addEventListener('click', (e) => {
-  e.target.classList.add('clicked');
-});
-</script>
-</body>
-</html>
diff --git a/testing/web-platform/tests/inert/inert-retargeting-iframe.tentative.html b/testing/web-platform/tests/inert/inert-retargeting-iframe.tentative.html
deleted file mode 100644
index 579fc57be258a..0000000000000
--- a/testing/web-platform/tests/inert/inert-retargeting-iframe.tentative.html
+++ /dev/null
@@ -1,279 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/resources/testdriver.js"></script>
-<script src="/resources/testdriver-actions.js"></script>
-<script src="/resources/testdriver-vendor.js"></script>
-<style>
-button#foreground,
-button#background {
-  position: absolute;
-  top: 75px;
-  left: 50px;
-  width: 100px;
-  height: 20px;
-}
-
-button#background {
-  left: 75px;
-  width: 150px;
-  height: 40px;
-  top: 125px;
-  line-height: 53px;
-}
-
-.clicked {
-  background-color: red;
-}
-
-#ancestorContainer.clicked {
-  background-color: green;
-}
-
-#ancestorContainer {
-  position: absolute;
-  top: 200px;
-  left: 10px;
-  width: 300px;
-  height: 300px;
-  background-color: blue;
-}
-
-#displacedAncestor {
-  position: absolute;
-  top: 13px;
-  left: 240px;
-  width: 300px;
-  height: 250px;
-  background-color: #ff89;
-}
-
-#displacedAncestor.clicked {
-  background-color: #f009;
-}
-
-#inertContainer {
-  background-color: #fff9;
-  position: absolute;
-  top: 35px;
-  left: -192px;
-  width: 200px;
-  height: 200px;
-}
-
-fieldset {
-  margin: 0;
-  padding: 0;
-  border: 1px solid black;
-}
-
-legend {
-  background-color: white;
-  border: 1px solid black;
-  margin-left: 5px;
-}
-</style>
-</head>
-<body>
-  <p>Click on "Inert button".</p>
-  <ul>
-    <li>The blue square ("Non-inert ancestor container") should turn green.</li>
-    <li>The yellow, semi-transparent square ("Non-inert, displaced container") should not turn red.</li>
-    <li>"Non-inert button" should not turn red.</li>
-  </ul>
-  <p style="margin-bottom:250px">(The full test suite checks a range of events.)</p>
-  <fieldset id="ancestorContainer">
-    <legend>Non-inert ancestor container</legend>
-    <iframe id="background" src="frame/button.html"></iframe>
-    <fieldset id="displacedAncestor">
-      <legend>Non-inert, displaced ancestor</legend>
-      <fieldset id="inertContainer" inert>
-        <legend>Inert container</legend>
-        <button id="foreground">foreground</button>
-      </fieldset>
-    </fieldset>
-  </fieldset>
-
-  <script>
-document.body.addEventListener('click', (e) => {
-  e.target.classList.add('clicked');
-});
-
-function clickOn(element) {
-  return new test_driver.Actions()
-      .pointerMove(0, 0, {origin: element})
-      .pointerDown({button: test_driver.Actions.prototype.ButtonType.LEFT})
-      .pointerUp({button: test_driver.Actions.prototype.ButtonType.LEFT})
-      .send();
-}
-
-function auxClickOn(element) {
-  return new test_driver.Actions()
-      .pointerMove(0, 0, {origin: element})
-      .pointerDown({button: test_driver.Actions.prototype.ButtonType.RIGHT})
-      .pointerUp({button: test_driver.Actions.prototype.ButtonType.RIGHT})
-      .send();
-}
-
-function dblClickOn(element) {
-  return new test_driver.Actions()
-      .pointerMove(0, 0, {origin: element})
-      .pointerDown({button: test_driver.Actions.prototype.ButtonType.LEFT})
-      .pointerUp({button: test_driver.Actions.prototype.ButtonType.LEFT})
-      .pointerDown({button: test_driver.Actions.prototype.ButtonType.LEFT})
-      .pointerUp({button: test_driver.Actions.prototype.ButtonType.LEFT})
-      .send();
-}
-
-function movePointerOver(element) {
-  let rect = element.getBoundingClientRect();
-  return new test_driver.Actions()
-      .pointerMove(0, 0, { origin: element })
-      .send();
-}
-
-function movePointerTo(x, y) {
-  return new test_driver.Actions()
-      .pointerMove(Math.ceil(x), Math.ceil(y), { origin: "viewport" })
-      .send();
-}
-
-function expectEventsOn(events, element) {
-  let promises = [];
-  for (event of events) {
-    ((event, element) => {
-      var promise = new Promise((resolve, reject) => {
-        let f = (e) => {
-          assert_equals(e.type, event);
-          assert_equals(e.target, element);
-          resolve();
-        }
-        element.addEventListener(event, f, { capture: true, once: true });
-
-        step_timeout(() => {
-          element.removeEventListener(event, f, { capture: true });
-          reject("did not get " + event + " on " + element.id);
-        }, 5000);
-      });
-      promises.push(promise);
-    })(event, element);
-  }
-  return promises;
-}
-
-function unexpectEventsOn(events, element) {
-  let promises = [];
-  for (event of events) {
-    ((event, element) => {
-      var promise = new Promise((resolve, reject) => {
-        let f = (e) => {
-          assert_equals(e.type, event);
-          assert_equals(e.target, element);
-          reject("got " + e.type + " on " + e.target.id);
-        }
-        element.addEventListener(event, f, { capture: true, once: true });
-
-        step_timeout(() => {
-          element.removeEventListener(event, f, { capture: true });
-          resolve();
-        }, 1000);
-      });
-      promises.push(promise);
-    })(event, element);
-  }
-  return promises;
-}
-
-test(() => {
-  let rect = foreground.getBoundingClientRect();
-  let center_x = rect.left + (rect.width / 2);
-  let center_y = rect.top + (rect.height / 2);
-  assert_equals(document.elementsFromPoint(center_x, center_y)[0], foreground);
-}, "elementsFromPoint returns inert element");
-
-promise_test(async () => {
-  // Test mouse events on non-inert element - events should go to "foreground"
-  inertContainer.inert = false;
-  await movePointerTo(0, 0);
-  let promises = expectEventsOn(["mouseover", "mouseenter", "mousemove", "mousedown",
-                                 "mouseup", "click", "auxclick", "mouseout",
-                                 "mouseleave"],
-                                foreground);
-  await clickOn(foreground);
-  await auxClickOn(foreground);
-  await dblClickOn(foreground);
-  let ancestorBox = ancestorContainer.getBoundingClientRect();
-  let inertBox = inertContainer.getBoundingClientRect();
-  let x = ancestorBox.left + (ancestorBox.width / 2);
-  let y = inertBox.bottom + ((ancestorBox.bottom - inertBox.bottom) / 2);
-  await movePointerTo(x, y);
-  await Promise.all(promises);
-}, "Tests that any mouse event on a non-inert element is correctly targeted to that element");
-
-promise_test(async () => {
-  // Make the containing element inert - now events should go to "container"
-  // which is the non-inert ancestor at the same position
-  inertContainer.inert = true;
-  await movePointerTo(0, 0);
-
-  let promises = expectEventsOn(["mouseover", "mouseenter", "mousemove", "mousedown",
-                                 "mouseup", "click", "auxclick"],
-                                ancestorContainer);
-
-  promises = promises.concat(unexpectEventsOn(["mouseout", "mouseleave"],
-                                              ancestorContainer));
-
-  await clickOn(foreground);
-  await auxClickOn(foreground);
-  await dblClickOn(foreground);
-  let ancestorBox = ancestorContainer.getBoundingClientRect();
-  let inertBox = inertContainer.getBoundingClientRect();
-  let x = ancestorBox.left + (ancestorBox.width / 2);
-  let y = inertBox.bottom + ((ancestorBox.bottom - inertBox.bottom) / 2);
-  await movePointerTo(x, y);
-  await Promise.all(promises);
-}, 'Tests that any mouse event on an inert element is targeted to the nearest non-inert ancestor at the same coordinates');
-
-promise_test(async () => {
-  // Test pointer events on non-inert element - events should go to "foreground"
-  inertContainer.inert = false;
-  await movePointerTo(0, 0);
-
-  let promises = expectEventsOn(["pointerover", "pointerenter", "pointermove",
-                                 "pointerdown", "pointerup", "pointerout",
-                                 "pointerleave"],
-                                foreground);
-  await clickOn(foreground);
-  let ancestorBox = ancestorContainer.getBoundingClientRect();
-  let inertBox = inertContainer.getBoundingClientRect();
-  let x = ancestorBox.left + (ancestorBox.width / 2);
-  let y = inertBox.bottom + ((ancestorBox.bottom - inertBox.bottom) / 2);
-  await movePointerTo(x, y);
-  await Promise.all(promises);
-}, "Tests that any pointer event on a non-inert element is correctly targeted to that element");
-
-promise_test(async () => {
-  // Make the containing element inert - now events should go to "container"
-  // which is the non-inert ancestor at the same position
-  inertContainer.inert = true;
-  await movePointerTo(0, 0);
-
-  let promises = expectEventsOn(["pointerover", "pointerenter", "pointermove",
-                                 "pointerdown", "pointerup" ],
-                                ancestorContainer);
-
-  promises = promises.concat(unexpectEventsOn(["pointerout", "pointerleave"],
-                                              ancestorContainer));
-  await clickOn(foreground);
-  let ancestorBox = ancestorContainer.getBoundingClientRect();
-  let inertBox = inertContainer.getBoundingClientRect();
-  let x = ancestorBox.left + (ancestorBox.width / 2);
-  let y = inertBox.bottom + ((ancestorBox.bottom - inertBox.bottom) / 2);
-  await movePointerTo(x, y);
-  await Promise.all(promises);
-}, 'Tests that any pointer event on an inert element is targeted to the nearest non-inert ancestor at the same coordinates');
-  </script>
-</body>
-</html>
diff --git a/testing/web-platform/tests/inert/inert-retargeting.tentative.html b/testing/web-platform/tests/inert/inert-retargeting.tentative.html
deleted file mode 100644
index 2280cf5a5d1fb..0000000000000
--- a/testing/web-platform/tests/inert/inert-retargeting.tentative.html
+++ /dev/null
@@ -1,290 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/resources/testdriver.js"></script>
-<script src="/resources/testdriver-actions.js"></script>
-<script src="/resources/testdriver-vendor.js"></script>
-<style>
-button#foreground,
-button#background {
-  position: absolute;
-  top: 75px;
-  left: 50px;
-  width: 100px;
-  height: 20px;
-}
-
-button#background {
-  left: 75px;
-  width: 150px;
-  height: 40px;
-  top: 125px;
-  line-height: 53px;
-}
-
-.clicked {
-  background-color: red;
-}
-
-#ancestorContainer.clicked {
-  background-color: green;
-}
-
-#ancestorContainer {
-  position: relative;
-  width: 300px;
-  height: 300px;
-  background-color: blue;
-}
-
-#displacedAncestor {
-  position: absolute;
-  top: 13px;
-  left: 240px;
-  width: 300px;
-  height: 250px;
-  background-color: #ff89;
-}
-
-#displacedAncestor.clicked {
-  background-color: #f009;
-}
-
-#inertContainer {
-  background-color: #fff9;
-  position: absolute;
-  top: 35px;
-  left: -192px;
-  width: 200px;
-  height: 200px;
-}
-
-fieldset {
-  margin: 0;
-  padding: 0;
-  border: 1px solid black;
-}
-
-legend {
-  background-color: white;
-  border: 1px solid black;
-  margin-left: 5px;
-}
-
-button.clicked::after {
-  content: " (clicked)";
-}
-
-.clicked > legend::after {
-  content: " (clicked)";
-}
-
-</style>
-</head>
-<body>
-  <p>Click on "foreground".</p>
-  <ul>
-    <li>The blue square ("Non-inert ancestor container") should turn green.</li>
-    <li>The yellow, semi-transparent square ("Non-inert, displaced container") should not turn red.</li>
-    <li>"Non-inert button" should not turn red.</li>
-  </ul>
-  <p>(The full test suite checks a range of events.)</p>
-  <fieldset id="ancestorContainer">
-    <legend>Non-inert ancestor container</legend>
-    <button id="background">background</button>
-    <fieldset id="displacedAncestor">
-      <legend>Non-inert, displaced ancestor</legend>
-      <fieldset id="inertContainer" inert>
-        <legend>Inert container</legend>
-        <button id="foreground">foreground</button>
-      </fieldset>
-    </fieldset>
-  </fieldset>
-
-  <script>
-document.body.addEventListener('click', (e) => {
-  e.target.classList.add('clicked');
-});
-
-function clickOn(element) {
-  return new test_driver.Actions()
-      .pointerMove(0, 0, {origin: element})
-      .pointerDown({button: test_driver.Actions.prototype.ButtonType.LEFT})
-      .pointerUp({button: test_driver.Actions.prototype.ButtonType.LEFT})
-      .send();
-}
-
-function auxClickOn(element) {
-  return new test_driver.Actions()
-      .pointerMove(0, 0, {origin: element})
-      .pointerDown({button: test_driver.Actions.prototype.ButtonType.RIGHT})
-      .pointerUp({button: test_driver.Actions.prototype.ButtonType.RIGHT})
-      .send();
-}
-
-function dblClickOn(element) {
-  return new test_driver.Actions()
-      .pointerMove(0, 0, {origin: element})
-      .pointerDown({button: test_driver.Actions.prototype.ButtonType.LEFT})
-      .pointerUp({button: test_driver.Actions.prototype.ButtonType.LEFT})
-      .pointerDown({button: test_driver.Actions.prototype.ButtonType.LEFT})
-      .pointerUp({button: test_driver.Actions.prototype.ButtonType.LEFT})
-      .send();
-}
-
-function movePointerOver(element) {
-  let rect = element.getBoundingClientRect();
-  return new test_driver.Actions()
-      .pointerMove(0, 0, { origin: element })
-      .send();
-}
-
-function movePointerTo(x, y) {
-  return new test_driver.Actions()
-      .pointerMove(x, y, { origin: "viewport" })
-      .send();
-}
-
-function expectEventsOn(events, element) {
-  let promises = [];
-  for (event of events) {
-    ((event, element) => {
-      var promise = new Promise((resolve, reject) => {
-        let f = (e) => {
-          assert_equals(e.type, event);
-          assert_equals(e.target, element);
-          resolve();
-        }
-        element.addEventListener(event, f, { capture: true, once: true });
-
-        step_timeout(() => {
-          element.removeEventListener(event, f, { capture: true });
-          reject("did not get " + event + " on " + element.id);
-        }, 1000);
-      });
-      promises.push(promise);
-    })(event, element);
-  }
-  return promises;
-}
-
-function unexpectEventsOn(events, element) {
-  let promises = [];
-  for (event of events) {
-    ((event, element) => {
-      var promise = new Promise((resolve, reject) => {
-        let f = (e) => {
-          assert_equals(e.type, event);
-          assert_equals(e.target, element);
-          reject("got " + e.type + " on " + e.target.id);
-        }
-        element.addEventListener(event, f, { capture: true, once: true });
-
-        step_timeout(() => {
-          element.removeEventListener(event, f, { capture: true });
-          resolve();
-        }, 1000);
-      });
-      promises.push(promise);
-    })(event, element);
-  }
-  return promises;
-}
-
-test(() => {
-  let rect = foreground.getBoundingClientRect();
-  let center_x = rect.left + (rect.width / 2);
-  let center_y = rect.top + (rect.height / 2);
-  assert_equals(document.elementsFromPoint(center_x, center_y)[0], foreground);
-}, "elementsFromPoint returns inert element");
-
-promise_test(async () => {
-  // Test mouse events on non-inert element - events should go to "foreground"
-  inertContainer.inert = false;
-  await movePointerTo(0, 0);
-  let promises = expectEventsOn(["mouseover", "mouseenter", "mousemove", "mousedown",
-                                 "mouseup", "click", "auxclick", "mouseout",
-                                 "mouseleave"],
-                                foreground);
-  await clickOn(foreground);
-  await auxClickOn(foreground);
-  await dblClickOn(foreground);
-  let ancestorBox = ancestorContainer.getBoundingClientRect();
-  let inertBox = inertContainer.getBoundingClientRect();
-  let x = ancestorBox.left + (ancestorBox.width / 2);
-  let y = inertBox.bottom + ((ancestorBox.bottom - inertBox.bottom) / 2);
-  await movePointerTo(x, y);
-  await Promise.all(promises);
-}, "Tests that any mouse event on a non-inert element is correctly targeted to that element");
-
-promise_test(async () => {
-  // Make the containing element inert - now events should go to "container"
-  // which is the non-inert ancestor at the same position
-  inertContainer.inert = true;
-  await movePointerTo(0, 0);
-
-  let promises = expectEventsOn(["mouseover", "mouseenter", "mousemove", "mousedown",
-                                 "mouseup", "click", "auxclick"],
-                                ancestorContainer);
-
-  // TODO(aboxhall): We are getting these unexpected events. Why?
-  promises = promises.concat(unexpectEventsOn(["mouseout", "mouseleave"],
-                                              ancestorContainer));
-
-  await clickOn(foreground);
-  await auxClickOn(foreground);
-  await dblClickOn(foreground);
-  let ancestorBox = ancestorContainer.getBoundingClientRect();
-  let inertBox = inertContainer.getBoundingClientRect();
-  let x = ancestorBox.left + (ancestorBox.width / 2);
-  let y = inertBox.bottom + ((ancestorBox.bottom - inertBox.bottom) / 2);
-  await movePointerTo(x, y);
-  await Promise.all(promises);
-}, 'Tests that any mouse event on an inert element is targeted to the nearest non-inert ancestor at the same coordinates');
-
-promise_test(async () => {
-  // Test pointer events on non-inert element - events should go to "foreground"
-  inertContainer.inert = false;
-  await movePointerTo(0, 0);
-
-  let promises = expectEventsOn(["pointerover", "pointerenter", "pointermove",
-                                 "pointerdown", "pointerup", "pointerout",
-                                 "pointerleave"],
-                                foreground);
-  await clickOn(foreground);
-  let ancestorBox = ancestorContainer.getBoundingClientRect();
-  let inertBox = inertContainer.getBoundingClientRect();
-  let x = ancestorBox.left + (ancestorBox.width / 2);
-  let y = inertBox.bottom + ((ancestorBox.bottom - inertBox.bottom) / 2);
-  await movePointerTo(x, y);
-  await Promise.all(promises);
-}, "Tests that any pointer event on a non-inert element is correctly targeted to that element");
-
-promise_test(async () => {
-  // Make the containing element inert - now events should go to "container"
-  // which is the non-inert ancestor at the same position
-  inertContainer.inert = true;
-  await movePointerTo(0, 0);
-
-  let promises = expectEventsOn(["pointerover", "pointerenter", "pointermove",
-                                 "pointerdown", "pointerup" ],
-                                ancestorContainer);
-
-  // TODO(aboxhall): We are getting these unexpected events. Why?
-  promises = promises.concat(unexpectEventsOn(["pointerout", "pointerleave"],
-                                              ancestorContainer));
-
-  await clickOn(foreground);
-  let ancestorBox = ancestorContainer.getBoundingClientRect();
-  let inertBox = inertContainer.getBoundingClientRect();
-  let x = ancestorBox.left + (ancestorBox.width / 2);
-  let y = inertBox.bottom + ((ancestorBox.bottom - inertBox.bottom) / 2);
-  await movePointerTo(x, y);
-  await Promise.all(promises);
-}, 'Tests that any pointer event on an inert element is targeted to the nearest non-inert ancestor at the same coordinates');
-
-</script>
-</body>
-</html>
