reftests: Fix background-size-zero test

We were drawing nothing, causing a timeout.

diff --git a/testsuite/reftests/background-size-zero.css b/testsuite/reftests/background-size-zero.css
index 8e9389ba1e45ae1313ea89f3b5016791dacb9672..8dc2d3337e00f437502fc584020ebd0ad412718b 100644 (file)
--- a/testsuite/reftests/background-size-zero.css
+++ b/testsuite/reftests/background-size-zero.css
@@ -1,6 +1,7 @@
 @import "reset-to-defaults.css";
 
 .background {
+  background-color: red;
   background-image: linear-gradient(to right, blue, blue);
   background-size: 0%;
 }