Basic support for boxSizing in CSS API

web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/properties/box.kt

@@ -22,3 +22,8 @@ fun StyleBuilder.height(value: CSSNumeric) {
 fun StyleBuilder.height(value: CSSAutoKeyword) {
     property("height", value)
 }
+
+// https://developer.mozilla.org/en-US/docs/Web/CSS/box-sizing
+fun StyleBuilder.boxSizing(value: String) {
+    property("box-sizing", value)
+}

web/core/src/jsTest/kotlin/css/CSSBoxTests.kt

@@ -7,6 +7,7 @@ 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.boxSizing
 import org.jetbrains.compose.web.css.height
 import org.jetbrains.compose.web.css.px
 import org.jetbrains.compose.web.css.width
@@ -49,4 +50,28 @@ class CSSBoxTests {
         assertEquals("90px", (root.children[0] as HTMLElement).style.height)
     }
 
+    @Test
+    fun boxSizing() = runTest {
+        composition {
+            Div(
+                {
+                    style {
+                        boxSizing("border-box")
+                    }
+                }
+            )
+            Div(
+                {
+                    style {
+                        boxSizing("content-box")
+                    }
+                }
+            )
+        }
+
+        assertEquals("border-box", (root.children[0] as HTMLElement).style.boxSizing)
+        assertEquals("content-box", (root.children[1] as HTMLElement).style.boxSizing)
+    }
+
+
 }