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diff --git a/testing/web-platform/tests/html/semantics/forms/the-button-element/active-onblur.html b/testing/web-platform/tests/html/semantics/forms/the-button-element/active-onblur.html
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+++ b/testing/web-platform/tests/html/semantics/forms/the-button-element/active-onblur.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" title="Joey Arhar" href="mailto:jarhar@chromium.org">
+<link rel="help" href="http://crbug.com/945854">
+<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>
+
+<!-- This behavior is not explicitly specified. -->
+
+<button id=b1>button one</button>
+<button id=b2>button two</button>
+
+<script>
+promise_test(async () => {
+  b1.focus();
+
+  // Hold spacebar down
+  await (new test_driver.Actions()).keyDown('\uE00D').send();
+  assert_equals(document.querySelector(':active'), b1,
+    'Buttons should be :active while the spacebar is pressed down.');
+
+  // Press tab
+  await (new test_driver.Actions()).keyDown('\uE004').keyUp('\uE004').send();
+  assert_equals(document.querySelector(':active'), null,
+    'Buttons should not be :active after tab is used to change focus.');
+
+  // Release spacebar
+  await (new test_driver.Actions()).keyUp('\uE00D').send();
+}, 'Buttons should clear :active when the user tabs away from them while holding spacebar.');
+</script>