diff --git a/index.html b/index.html
index 0289391..aae0877 100644
--- a/index.html
+++ b/index.html
@@ -42,6 +42,7 @@
   --header-background-color: #DDD;
   --header-text-color: #00A;
   --different-text-color: magenta;
+  --unknown-text-color: #458;
 }
 @media (prefers-color-scheme: dark) {
 
@@ -58,6 +59,7 @@
     --header-background-color: #333;
     --header-text-color: lightgreen;
     --different-text-color: orange;
+    --unknown-text-color: #8AF;
   }
 } 
 body {
@@ -133,6 +135,9 @@
 .different-worse {
   color: var(--error-text-color);
 }
+.unknown {
+  color: var(--unknown-text-color);
+}
 
 .limit>td:first-child,
 .feature>td:first-child,
diff --git a/index.js b/index.js
index 8cd7486..fdee523 100644
--- a/index.js
+++ b/index.js
@@ -244,15 +244,20 @@ function markDifferencesInLimits(adapter) {
       .map(([k, v]) => {
         const info = kLimitInfo[k];
         const isDiff = info && info.default !== v;
-        const diffClass = isDiff
-           ? differenceWorse(info, v) ? 'different-worse' : 'different-better'
-           : '';
+        const diffClass = info
+           ?  (isDiff
+                 ? differenceWorse(info, v) ? 'different-worse' : 'different-better'
+                : '')
+           : 'unknown';
         const value = v > 1024 && info ? `${v} (${shortSizeByType(v, info.type)})` : v;
         return [
           k,
           isDiff
             ? [value, {className: `${diffClass} nowrap`, title: `default${adapter.isCompatibilityMode ? ' in compat' : ''}: ${shortSizeByType(adapter.isCompatibilityMode ? info.compat : info.default, info.type)}`}]
-            : [value, {className: 'nowrap', title: 'same as default'}]
+            : info
+               ? [value, {className: 'nowrap', title: 'same as default'}]
+               : [value, {className: 'unknown nowrap', title: 'unknown limit (new?)'}]
+
         ];
       })
   );