diff --git a/test/pagespeed_test.conf.template b/test/pagespeed_test.conf.template
index e3a9cdae8..64ee9f774 100644
--- a/test/pagespeed_test.conf.template
+++ b/test/pagespeed_test.conf.template
@@ -566,6 +566,10 @@ http {
     pagespeed UrlValuedAttribute img alt-src Image;
     pagespeed UrlValuedAttribute video alt-a Image;
     pagespeed UrlValuedAttribute video alt-b Image;
+    pagespeed UrlValuedAttribute link data-stylesheet Stylesheet;
+    pagespeed UrlValuedAttribute span data-stylesheet-a Stylesheet;
+    pagespeed UrlValuedAttribute span data-stylesheet-b Stylesheet;
+    pagespeed UrlValuedAttribute span data-stylesheet-c Stylesheet;
 
     # Also test that we can redefine spec-defined attributes.
     pagespeed UrlValuedAttribute blockquote cite Image;