Fix #35743 - wrong assertion in background-position-y-valid.html (#35744)

diff --git a/css/css-backgrounds/parsing/background-position-y-valid.html b/css/css-backgrounds/parsing/background-position-y-valid.html
index 55c54b8..5a474a4 100644
--- a/css/css-backgrounds/parsing/background-position-y-valid.html
+++ b/css/css-backgrounds/parsing/background-position-y-valid.html
@@ -25,7 +25,7 @@
 test_valid_value("background-position-y", "-20%, 10px");
 test_valid_value("background-position-y", "center, top, bottom");
 test_valid_value("background-position-y", "0.5em, y-start, y-end");
-test_valid_value("background-position-y", "calc(10px - 0.5em), top -20%, bottom 10px", "calc(-0.5em + 10px), top -20%, top 10px");
+test_valid_value("background-position-y", "calc(10px - 0.5em), top -20%, bottom 10px", "calc(-0.5em + 10px), top -20%, bottom 10px");
 </script>
 </body>
 </html>