Minimal support for backgroundOrigin in CSS API

web/core/src/jsMain/kotlin/androidx/compose/web/css/properties/background.kt

@@ -27,6 +27,11 @@ fun StyleBuilder.backgroundImage(value: String) {
     property("background-image", value)
 }
 
+// https://developer.mozilla.org/en-US/docs/Web/CSS/background-origin
+fun StyleBuilder.backgroundOrigin(value: String) {
+    property("background-origin", value)
+}
+
 // https://developer.mozilla.org/en-US/docs/Web/CSS/background-position
 fun StyleBuilder.backgroundPosition(value: String) {
     property("background-position", value)

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

@@ -122,4 +122,25 @@ class CSSBackgroundTests {
         assertEquals("padding-box", window.getComputedStyle(root.children[1] as HTMLElement).backgroundClip)
         assertEquals("content-box", window.getComputedStyle(root.children[2] as HTMLElement).backgroundClip)
     }
+
+    @Test
+    fun backgroundOrigin() = runTest {
+        composition {
+            Div({style {
+                backgroundOrigin("border-box")
+            }})
+            Div({style {
+                backgroundOrigin("padding-box")
+            }})
+            Div({style {
+                backgroundOrigin("content-box")
+            }})
+        }
+
+
+        assertEquals("border-box", window.getComputedStyle(root.children[0] as HTMLElement).backgroundOrigin)
+        assertEquals("padding-box", window.getComputedStyle(root.children[1] as HTMLElement).backgroundOrigin)
+        assertEquals("content-box", window.getComputedStyle(root.children[2] as HTMLElement).backgroundOrigin)
+    }
+
 }