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diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/inert-inlines.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/inert-inlines.html
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+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/inert-inlines.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=author href="mailto:falken@chromium.org">
+<link rel=help href="https://html.spec.whatwg.org/multipage/interactive-elements.html#the-dialog-element">
+<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=241699">
+<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>
+
+<p>
+To test manually, click on all the "Click me"s.
+The test fails if you see red.
+</p>
+
+<style>
+dialog {
+  width: 50px;
+}
+</style>
+
+<a id="a" href="javascript:void(0)">Click me</a>
+<button id="button">Click me</button>
+<div id="div" style="background-color: blue; width: 50px; height: 50px">Click meeee</div>
+<span id="span">Click me</span>
+<div id="dialog-parent" style="width: 50px; height: 50px">
+  <span id="dialog-sibling">Click meeee</span>
+  <dialog></dialog>
+</div>
+
+<script>
+promise_test(async () => {
+  async function clickOn(element) {
+    let absoluteTop = 0;
+    let absoluteLeft = 0;
+    for (let parentNode = element; parentNode; parentNode = parentNode.offsetParent) {
+      absoluteLeft += parentNode.offsetLeft;
+      absoluteTop += parentNode.offsetTop;
+    }
+
+    const x = Math.round(absoluteLeft + element.offsetWidth / 2);
+    const y = Math.round(absoluteTop + element.offsetHeight / 2);
+    const actions = new test_driver.Actions()
+      .pointerMove(x, y)
+      .pointerDown()
+      .pointerUp()
+      .pointerMove(0, 0);
+    await actions.send();
+  }
+
+  function eventFiredOnInertElement(e) {
+    e.target.style.background = 'red';
+    inertElementFiredOn = true;
+  }
+
+  inertElements = ['a', 'button', 'div', 'span']
+  inertElements.forEach(function(id) {
+    element = document.getElementById(id);
+    element.addEventListener('click', eventFiredOnInertElement);
+    element.addEventListener('mousemove', eventFiredOnInertElement);
+  });
+
+  document.addEventListener('click', function(e) {
+    document.firedOn = true;
+  });
+
+  document.getElementById('dialog-parent').addEventListener('click', function(e) {
+    e.target.firedOn = true;
+  });
+
+  document.querySelector('dialog').showModal();
+  for (const id of inertElements) {
+    expectedTarget = document;
+    if (id == 'dialog-sibling')
+      expectedTarget = document.getElementById('dialog-parent')
+    element = document.getElementById(id);
+    inertElementFiredOn = false;
+    expectedTarget.firedOn = false;
+    await clickOn(element);
+    assert_false(inertElementFiredOn, 'clicking on ' + id);
+    assert_true(expectedTarget.firedOn, 'clicking on ' + id);
+  }
+}, 'Tests that inert inlines do not receive mouse events.');
+</script>