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-rw-r--r--lib/ur/basis.urs2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/ur/basis.urs b/lib/ur/basis.urs
index 8b0561c8..dc4d9ba2 100644
--- a/lib/ur/basis.urs
+++ b/lib/ur/basis.urs
@@ -602,6 +602,8 @@ val setval : sql_sequence -> int -> transaction unit
type css_class
val show_css_class : show css_class
+val null : css_class
+(* No special formatting *)
val classes : css_class -> css_class -> css_class
(* The equivalent of writing one class after the other, separated by a space, in
* an HTML 'class' attribute *)