diff --git a/html/browsers/windows/consume-user-activation/support/current.html b/html/browsers/windows/consume-user-activation/support/current.html
new file mode 100644
index 00000000000000..52bcc455e2abd7
--- /dev/null
+++ b/html/browsers/windows/consume-user-activation/support/current.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>Current page used as a test helper</title>
+<button id="focus-opener-button" onclick="opener.focus()">Focus opener</button>
+<script>
+'use strict';
+
+onload = async () => {
+  await opener.opener.test_driver.click(document.getElementById("focus-opener-button"));
+  opener.postMessage("current page", "*");
+};
+</script>
diff --git a/html/browsers/windows/consume-user-activation/support/incumbent.html b/html/browsers/windows/consume-user-activation/support/incumbent.html
new file mode 100644
index 00000000000000..a6ddd7ae4b0166
--- /dev/null
+++ b/html/browsers/windows/consume-user-activation/support/incumbent.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<title>Incumbent page used as a test helper</title>
+<button id="focus-opener-button" onclick="opener.focus()">Focus opener</button>
+<script>
+'use strict';
+
+function pageDone(expectedMessage) {
+  return new Promise(resolve => {
+    window.addEventListener('message', e => {
+      if (e.data === expectedMessage) {
+        resolve();
+      }
+    });
+  });
+}
+
+onload = async () => {
+  await opener.test_driver.bless("open current popup", null, window);
+  const currentDone = pageDone("current page");
+  const currentWin = window.open("current.html", "_blank");
+  await currentDone;
+  await opener.test_driver.bless("open relevant popup", null, window);
+  const relevantDone = pageDone("relevant page");
+  const relevantWin = window.open("relevant.html", "_blank");
+  await relevantDone;
+  window.openTestPopup = function() {
+    // This is the multi-global incarnation
+    return currentWin.open.call(relevantWin, "/resources/blank.html", "_blank");
+  };
+  opener.currentWin = currentWin;
+  opener.relevantWin = relevantWin;
+  await opener.test_driver.click(document.getElementById("focus-opener-button"));
+  opener.postMessage("incumbent page", "*");
+};
+</script>
diff --git a/html/browsers/windows/consume-user-activation/support/relevant.html b/html/browsers/windows/consume-user-activation/support/relevant.html
new file mode 100644
index 00000000000000..fa809b2d779d9f
--- /dev/null
+++ b/html/browsers/windows/consume-user-activation/support/relevant.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>Relevant page used as a test helper</title>
+<button id="focus-opener-button" onclick="opener.focus()">Focus opener</button>
+<script>
+'use strict';
+
+onload = async () => {
+  await opener.opener.test_driver.click(document.getElementById("focus-opener-button"));
+  opener.postMessage("relevant page", "*");
+};
+</script>
diff --git a/html/browsers/windows/consume-user-activation/window-open-multi-global.html b/html/browsers/windows/consume-user-activation/window-open-multi-global.html
new file mode 100644
index 00000000000000..ac8ed8a1264806
--- /dev/null
+++ b/html/browsers/windows/consume-user-activation/window-open-multi-global.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<title>window.open() and consuming user activation with multiple globals in play</title>
+<link rel="help" href="https://html.spec.whatwg.org/#window-open-steps">
+<link rel="help" href="https://html.spec.whatwg.org/#the-rules-for-choosing-a-navigable">
+<!--
+2. Let sourceDocument be the entry global object's associated Document.
+10. Let targetNavigable and windowType be the result of applying the rules for choosing a navigable
+    given target, sourceDocument's node navigable, and noopener.
+-->
+<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>
+
+<!-- This is the entry global -->
+
+<script>
+'use strict';
+
+function pageDone(expectedMessage) {
+  return new Promise(resolve => {
+    window.addEventListener('message', e => {
+      if (e.data === expectedMessage) {
+        resolve();
+      }
+    });
+  });
+}
+
+promise_test(async function(t) {
+  await test_driver.bless("open incumbent popup");
+  const incumbentDone = pageDone("incumbent page");
+  const incumbentWin = window.open("support/incumbent.html", "_blank");
+  // incumbent.html opens two further popups and sets these properties (for this window):
+  // window.currentWin
+  // window.relevantWin
+  await incumbentDone;
+  await test_driver.bless("user activation in entry global");
+  const testWin = incumbentWin.openTestPopup();
+  t.add_cleanup(() => {
+    testWin.close();
+    relevantWin.close();
+    currentWin.close();
+    incumbentWin.close();
+  });
+  assert_false(navigator.userActivation.isActive, "User activation of the entry global should be consumed");
+});
+</script>
diff --git a/html/browsers/windows/consume-user-activation/window-open.html b/html/browsers/windows/consume-user-activation/window-open.html
new file mode 100644
index 00000000000000..8328d99a1de07c
--- /dev/null
+++ b/html/browsers/windows/consume-user-activation/window-open.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<title>window.open() and consuming user activation</title>
+<link rel="help" href="https://html.spec.whatwg.org/#the-rules-for-choosing-a-navigable">
+<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>
+<script>
+'use strict';
+
+promise_test(async function(t) {
+  await test_driver.bless("user activation");
+  const testWin = window.open("/resources/blank.html", "_blank");
+  t.add_cleanup(() => {
+    testWin.close();
+  });
+  assert_false(navigator.userActivation.isActive, "User activation should be consumed");
+});
+</script>
