diff --git a/src/test/kotlin/html4tree/MainTest.kt b/src/test/kotlin/html4tree/MainTest.kt
index 7236b84..0a4b060 100644
--- a/src/test/kotlin/html4tree/MainTest.kt
+++ b/src/test/kotlin/html4tree/MainTest.kt
@@ -334,6 +334,8 @@ class MainTest {
         assertTrue(htmlContent.contains("font-family: system-ui, -apple-system, BlinkMacSystemFont, \"Segoe UI\", sans-serif;"))
         assertTrue(htmlContent.contains("line-height: 1.5;"))
         assertTrue(htmlContent.contains("padding: 1rem;"))
+        assertTrue(htmlContent.contains("transition: background-color"))
+        assertTrue(htmlContent.contains("prefers-reduced-motion"))
     }
 
     @Test