diff --git a/testing/web-platform/tests/longtask-timing/supported-longtask-types.any.js b/testing/web-platform/tests/longtask-timing/supported-longtask-types.window.js
similarity index 100%
rename from testing/web-platform/tests/longtask-timing/supported-longtask-types.any.js
rename to testing/web-platform/tests/longtask-timing/supported-longtask-types.window.js
diff --git a/testing/web-platform/tests/navigation-timing/supported_navigation_type.any.js b/testing/web-platform/tests/navigation-timing/supported_navigation_type.window.js
similarity index 100%
rename from testing/web-platform/tests/navigation-timing/supported_navigation_type.any.js
rename to testing/web-platform/tests/navigation-timing/supported_navigation_type.window.js
diff --git a/testing/web-platform/tests/paint-timing/idlharness.window.js b/testing/web-platform/tests/paint-timing/idlharness.window.js
index 115af73dfc80..049f0f18f1be 100644
--- a/testing/web-platform/tests/paint-timing/idlharness.window.js
+++ b/testing/web-platform/tests/paint-timing/idlharness.window.js
@@ -19,6 +19,9 @@ idl_test(
         resolve();
       });
       observer.observe({ entryTypes: ['paint'] });
+      const div = document.createElement('div');
+      div.innerHTML = 'Hello World';
+      document.body.appendChild(div);
     });
     const timeout = new Promise((_, reject) => {
       t.step_timeout(() => reject('Timed out waiting for paint event'), 3000);
diff --git a/testing/web-platform/tests/paint-timing/supported-paint-type.any.js b/testing/web-platform/tests/paint-timing/supported-paint-type.window.js
similarity index 100%
rename from testing/web-platform/tests/paint-timing/supported-paint-type.any.js
rename to testing/web-platform/tests/paint-timing/supported-paint-type.window.js