1 files changed, 11 insertions, 2 deletions
diff --git a/lib/js/urweb.js b/lib/js/urweb.js
index bf20cfd4..f81f05e3 100644
--- a/lib/js/urweb.js
+++ b/lib/js/urweb.js
@@ -1310,6 +1310,9 @@ function dynClass(pnode, html, s_class, s_style) {
     var x = null;
     var y = null;
 
+    var classNameBefore = html.className;
+    var styleCssBefore = html.style.cssText;
+
     if (s_class) {
         x = document.createElement("script");
         x.dead = false;
@@ -1322,7 +1325,10 @@ function dynClass(pnode, html, s_class, s_style) {
                 freeClosure(ls.data);
 
             var cls = {v : null};
-            html.className = flatten(cls, v);
+            var s = flatten(cls, v);
+            if (classNameBefore)
+                s += " " + classNameBefore;
+            html.className = s;
 	    x.closures = concat(cls.v, htmlCls);
         }
 
@@ -1342,7 +1348,10 @@ function dynClass(pnode, html, s_class, s_style) {
                 freeClosure(ls.data);
 
             var cls = {v : null};
-            html.style.cssText = flatten(cls, v);
+            var s = flatten(cls, v);
+            if (styleCssBefore)
+                s += " " + styleCssBefore;
+            html.style.cssText = s;
 	    y.closures = concat(cls.v, htmlCls2);
         }