diff --git a/assets/core.styl b/assets/core.styl
index e562f97e92..98f6c7df18 100644
--- a/assets/core.styl
+++ b/assets/core.styl
@@ -57,7 +57,10 @@ resets(arr)
     margin: 0
     padding: 0
   p, h1, h2, h3, h4, h5, h6
-    counter-reset: resets(0..MAX_INDENT)
+    @supports (counter-set: none)
+      counter-set: resets(0..MAX_INDENT)
+    @supports not (counter-set: none)
+      counter-reset: resets(0..MAX_INDENT)
   table
     border-collapse: collapse
   td