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diff --git a/testing/web-platform/tests/html/semantics/forms/the-button-element/button-activate-keyup-prevented.html b/testing/web-platform/tests/html/semantics/forms/the-button-element/button-activate-keyup-prevented.html
new file mode 100644
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+++ b/testing/web-platform/tests/html/semantics/forms/the-button-element/button-activate-keyup-prevented.html
@@ -0,0 +1,38 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Button activation submits on keyup, but not if keydown is defaultPrevented</title>
+<link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1481400">
+<link rel=author href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel=author href="https://mozilla.org" title="Mozilla">
+<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>
+<button>The button</button>
+<script>
+let button = document.querySelector("button");
+promise_test(async t => {
+  button.focus();
+  assert_equals(document.activeElement, button, "Button should be focused");
+  let clickPromise = new Promise(resolve => {
+    button.addEventListener("click", resolve, { once: true });
+  });
+
+  await test_driver.send_keys(button, " ");
+
+  await clickPromise;
+
+  assert_true(true, "Button should have activated");
+
+  document.addEventListener("keydown", t.step_func(function(e) {
+    e.preventDefault();
+  }));
+
+  button.addEventListener("click", t.unreached_func("button got incorrectly activated"));
+
+  await test_driver.send_keys(button, " ");
+
+  await new Promise(resolve => t.step_timeout(resolve, 0));
+  assert_true(true, "Button should not have activated");
+});
+</script>