diff --git a/web/core/src/jsTest/kotlin/StaticComposableTests.kt b/web/core/src/jsTest/kotlin/StaticComposableTests.kt
index 720f287357..865982678d 100644
--- a/web/core/src/jsTest/kotlin/StaticComposableTests.kt
+++ b/web/core/src/jsTest/kotlin/StaticComposableTests.kt
@@ -257,24 +257,6 @@ class StaticComposableTests {
         assertEquals("flex-shrink: 0.6;", (root.children[3] as HTMLElement).style.cssText)
     }
 
-    @Test
-    fun stylesWidth() {
-        val root = "div".asHtmlElement()
-        renderComposable(
-            root = root
-        ) {
-            Div(
-                {
-                    style {
-                        width(100.px)
-                    }
-                }
-            )
-        }
-
-        assertEquals("width: 100px;", (root.children[0] as HTMLElement).style.cssText)
-    }
-
     @Test
     fun stylesBorderRadius() {
         val root = "div".asHtmlElement()
@@ -424,24 +406,6 @@ class StaticComposableTests {
         assertEquals("right: 100%;", (root.children[1] as HTMLElement).style.cssText)
     }
 
-    @Test
-    fun stylesHeight() {
-        val root = "div".asHtmlElement()
-        renderComposable(
-            root = root
-        ) {
-            Div(
-                {
-                    style {
-                        height(100.px)
-                    }
-                }
-            )
-        }
-
-        assertEquals("height: 100px;", (root.children[0] as HTMLElement).style.cssText)
-    }
-
     @Test
     fun stylesDisplay() {
         val root = "div".asHtmlElement()
diff --git a/web/core/src/jsTest/kotlin/css/CSSBoxTests.kt b/web/core/src/jsTest/kotlin/css/CSSBoxTests.kt
new file mode 100644
index 0000000000..19b53299d6
--- /dev/null
+++ b/web/core/src/jsTest/kotlin/css/CSSBoxTests.kt
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2020-2021 JetBrains s.r.o. and respective authors and developers.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE.txt file.
+ */
+
+package org.jetbrains.compose.web.core.tests.css
+
+import org.jetbrains.compose.web.core.tests.asHtmlElement
+import org.jetbrains.compose.web.core.tests.runTest
+import org.jetbrains.compose.web.css.height
+import org.jetbrains.compose.web.css.px
+import org.jetbrains.compose.web.css.width
+import org.jetbrains.compose.web.dom.Div
+import org.jetbrains.compose.web.renderComposable
+import org.w3c.dom.HTMLElement
+import org.w3c.dom.get
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class CSSBoxTests {
+
+    @Test
+    fun stylesWidth() = runTest {
+        composition {
+            Div(
+                {
+                    style {
+                        width(100.px)
+                    }
+                }
+            )
+        }
+
+        assertEquals("100px", (root.children[0] as HTMLElement).style.width)
+    }
+
+    @Test
+    fun stylesHeight() = runTest {
+        composition {
+            Div(
+                {
+                    style {
+                        height(90.px)
+                    }
+                }
+            )
+        }
+
+        assertEquals("90px", (root.children[0] as HTMLElement).style.height)
+    }
+
+}
\ No newline at end of file