Fix css changes with macOS 13 and Safari

lib/web_ui/test/engine/semantics/semantics_test.dart

@@ -799,7 +799,12 @@ void _testContainer() {
         owner().semanticsHost.querySelector('flt-semantics-container')!;
 
     expect(parentElement.style.transform, 'matrix(1, 0, 0, 1, 10, 10)');
-    expect(parentElement.style.transformOrigin, '0px 0px 0px');
+    if (isSafari) {
+      // macOS 13 returns different values than macOS 12.
+      expect(parentElement.style.transformOrigin, anyOf(contains('0px 0px 0px'), contains('0px 0px')));
+    } else {
+      expect(parentElement.style.transformOrigin, '0px 0px 0px');
+    }
     expect(container.style.top, '-10px');
     expect(container.style.left, '-10px');
     semantics().semanticsEnabled = false;

lib/web_ui/test/engine/text_editing_test.dart

@@ -3075,11 +3075,18 @@ Future<void> testMain() async {
 
       final DomHTMLElement input = editingStrategy!.activeDomElement;
       expect(input.style.color, contains('transparent'));
-      expect(input.style.background, contains('transparent'));
+      if (isSafari) {
+        // macOS 13 returns different values than macOS 12.
+        expect(input.style.background, anyOf(contains('transparent'), contains('none')));
+        expect(input.style.outline, anyOf(contains('none'), contains('currentcolor')));
+        expect(input.style.border, anyOf(contains('none'), contains('medium')));
+      } else {
+        expect(input.style.background, contains('transparent'));
+        expect(input.style.outline, contains('none'));
+        expect(input.style.border, contains('none'));
+      }
       expect(input.style.backgroundColor, contains('transparent'));
       expect(input.style.caretColor, contains('transparent'));
-      expect(input.style.outline, contains('none'));
-      expect(input.style.border, contains('none'));
       expect(input.style.textShadow, contains('none'));
     });