diff --git a/testing/web-platform/tests/compute-pressure/compute_pressure_cross_origin_focus_control.tentative.https.window.js b/testing/web-platform/tests/compute-pressure/compute_pressure_cross_origin_focus_control.tentative.https.window.js
new file mode 100644
index 00000000000000..982e4bba0e6cb7
--- /dev/null
+++ b/testing/web-platform/tests/compute-pressure/compute_pressure_cross_origin_focus_control.tentative.https.window.js
@@ -0,0 +1,50 @@
+// META: timeout=long
+// META: script=/common/get-host-info.sub.js
+
+'use strict';
+
+promise_test(t => {
+  const iframe = document.createElement('iframe');
+  iframe.src = get_host_info().HTTPS_REMOTE_ORIGIN +
+      '/compute-pressure/resources/support-iframe.html';
+  document.body.appendChild(iframe);
+  iframe.contentWindow.focus();
+
+  const observer = new PressureObserver(() => {
+    assert_unreached('The observer callback should not be called');
+  });
+  t.add_cleanup(() => {
+    observer.disconnect();
+    iframe.remove();
+  });
+
+  return new Promise(resolve => t.step_timeout(resolve, 2000));
+}, 'Observer in main frame should not receive PressureRecord when focused on cross-origin iframe');
+
+promise_test(async t => {
+  const iframe = document.createElement('iframe');
+  iframe.src = get_host_info().HTTPS_REMOTE_ORIGIN +
+      '/compute-pressure/resources/support-iframe.html';
+  iframe.allow = 'compute-pressure';
+  const iframeLoadWatcher = new EventWatcher(t, iframe, 'load');
+  document.body.appendChild(iframe);
+  await iframeLoadWatcher.wait_for('load');
+  // Focus on the main frame to make the iframe lose focus, so that
+  // PressureObserver in the iframe can't receive PressureRecord by default.
+  // If the main frame has focus, but the iframe is cross-origin with the main
+  // frame, PressureObserver in the iframe still can't receive PressureRecord.
+  window.focus();
+
+  return new Promise((resolve, reject) => {
+    window.addEventListener('message', (e) => {
+      if (e.data.result === 'timeout') {
+        resolve();
+      } else if (e.data.result === 'success') {
+        reject('Observer should not receive PressureRecord');
+      } else {
+        reject('Got unexpected reply');
+      }
+    }, {once: true});
+    iframe.contentWindow.postMessage({command: 'start'}, '*');
+  });
+}, 'Observer in iframe should not receive PressureRecord when focused on cross-origin main frame');
diff --git a/testing/web-platform/tests/compute-pressure/compute_pressure_privacy_test.tentative.https.window.js b/testing/web-platform/tests/compute-pressure/compute_pressure_privacy_test.tentative.https.window.js
index 3a4198f547cc4b..ceea886323cdfc 100644
--- a/testing/web-platform/tests/compute-pressure/compute_pressure_privacy_test.tentative.https.window.js
+++ b/testing/web-platform/tests/compute-pressure/compute_pressure_privacy_test.tentative.https.window.js
@@ -16,12 +16,13 @@ promise_test(async t => {
   assert_not_equals(pipWindow.height, 0);
 
   const iframe = document.createElement('iframe');
+  iframe.src = get_host_info().HTTPS_REMOTE_ORIGIN +
+      '/compute-pressure/resources/support-iframe.html';
   document.body.appendChild(iframe);
-  // Focus on the iframe to make the main frame lose focus, so that
-  // PressureObserver in the main frame can't receive PressureRecord
-  // by default. However, if the main frame is the initiator of active
-  // Picture-in-Picture session, PressureObserver in the main frame can
-  // receive PressureRecord.
+  // Focus on the cross-origin iframe, so that PressureObserver in the main
+  // frame can't receive PressureRecord by default. However, if the main
+  // frame is the initiator of active Picture-in-Picture session,
+  // PressureObserver in the main frame can receive PressureRecord.
   iframe.contentWindow.focus();
 
   await new Promise(resolve => {
@@ -45,11 +46,13 @@ promise_test(async t => {
   assert_true(stream.active);
 
   const iframe = document.createElement('iframe');
+  iframe.src = get_host_info().HTTPS_REMOTE_ORIGIN +
+      '/compute-pressure/resources/support-iframe.html';
   document.body.appendChild(iframe);
-  // Focus on the iframe to make the main frame lose focus, so that
-  // PressureObserver in the main frame can't receive PressureRecord
-  // by default. However, if the main frame's browsing context is capturing,
-  // PressureObserver in the main frame can receive PressureRecord.
+  // Focus on the cross-origin iframe, so that PressureObserver in the main
+  // frame can't receive PressureRecord by default. However, if the main
+  // frame's browsing context is capturing, PressureObserver in the main
+  // frame can receive PressureRecord.
   iframe.contentWindow.focus();
 
   await new Promise(resolve => {
@@ -62,69 +65,3 @@ promise_test(async t => {
     observer.observe('cpu');
   });
 }, 'Observer should receive PressureRecord if browsing context is capturing');
-
-promise_test(async t => {
-  const iframe = document.createElement('iframe');
-  document.body.appendChild(iframe);
-  // Focus on the iframe to make the main frame lose focus, so that
-  // PressureObserver in the main frame can't receive PressureRecord
-  // by default.
-  iframe.contentWindow.focus();
-
-  const observer = new PressureObserver(() => {
-    assert_unreached('The observer callback should not be called');
-  });
-  t.add_cleanup(() => {
-    observer.disconnect();
-    iframe.remove();
-  });
-
-  return new Promise(resolve => t.step_timeout(resolve, 2000));
-}, 'Observer should not receive PressureRecord when top-level browsing context does not have system focus');
-
-promise_test(async t => {
-  const iframe = document.createElement('iframe');
-  document.body.appendChild(iframe);
-  // Focus on the main frame to make the iframe lose focus, so that
-  // PressureObserver in the iframe can't receive PressureRecord by default.
-  // However, if the iframe is same-origin with the main frame and the main
-  // frame has focus, PressureObserver in iframe can receive PressureRecord.
-  window.focus();
-
-  await new Promise(resolve => {
-    const observer = new iframe.contentWindow.PressureObserver(resolve);
-    t.add_cleanup(() => {
-      observer.disconnect();
-      iframe.remove();
-    });
-    observer.observe('cpu');
-  });
-}, 'Observer in iframe should receive PressureRecord when focused on same-origin main frame');
-
-promise_test(async t => {
-  const iframe = document.createElement('iframe');
-  iframe.src = get_host_info().HTTPS_REMOTE_ORIGIN +
-      '/compute-pressure/resources/support-iframe.html';
-  iframe.allow = 'compute-pressure';
-  const iframeLoadWatcher = new EventWatcher(t, iframe, 'load');
-  document.body.appendChild(iframe);
-  await iframeLoadWatcher.wait_for('load');
-  // Focus on the main frame to make the iframe lose focus, so that
-  // PressureObserver in the iframe can't receive PressureRecord by default.
-  // If the main frame has focus, but the iframe is cross-origin with the main
-  // frame, PressureObserver in the iframe still can't receive PressureRecord.
-  window.focus();
-
-  return new Promise((resolve, reject) => {
-    window.addEventListener('message', (e) => {
-      if (e.data.result === 'timeout') {
-        resolve();
-      } else if (e.data.result === 'success') {
-        reject('Observer should not receive PressureRecord');
-      } else {
-        reject('Got unexpected reply');
-      }
-    }, {once: true});
-    iframe.contentWindow.postMessage({command: 'start'}, '*');
-  });
-}, 'Observer in iframe should not receive PressureRecord when focused on cross-origin main frame');
diff --git a/testing/web-platform/tests/compute-pressure/compute_pressure_same_origin_focus_control.tentative.https.window.js b/testing/web-platform/tests/compute-pressure/compute_pressure_same_origin_focus_control.tentative.https.window.js
new file mode 100644
index 00000000000000..746f119f249c8c
--- /dev/null
+++ b/testing/web-platform/tests/compute-pressure/compute_pressure_same_origin_focus_control.tentative.https.window.js
@@ -0,0 +1,35 @@
+'use strict';
+
+promise_test(async t => {
+  const iframe = document.createElement('iframe');
+  document.body.appendChild(iframe);
+  iframe.contentWindow.focus();
+
+  await new Promise(resolve => {
+    const observer = new PressureObserver(resolve);
+    t.add_cleanup(async () => {
+      observer.disconnect();
+      iframe.remove();
+    });
+    observer.observe('cpu');
+  });
+}, 'Observer in main frame should receive PressureRecord when focused on same-origin iframe');
+
+promise_test(async t => {
+  const iframe = document.createElement('iframe');
+  document.body.appendChild(iframe);
+  // Focus on the main frame to make the iframe lose focus, so that
+  // PressureObserver in the iframe can't receive PressureRecord by default.
+  // However, if the iframe is same-origin with the main frame and the main
+  // frame has focus, PressureObserver in iframe can receive PressureRecord.
+  window.focus();
+
+  await new Promise(resolve => {
+    const observer = new iframe.contentWindow.PressureObserver(resolve);
+    t.add_cleanup(() => {
+      observer.disconnect();
+      iframe.remove();
+    });
+    observer.observe('cpu');
+  });
+}, 'Observer in iframe should receive PressureRecord when focused on same-origin main frame');