Add menu to list of button-type exceptions

Author: wooorm

index.js

@@ -197,7 +197,10 @@ function isNode(tagName, value) {
     }
 
     if (tagName === 'button') {
-        return type !== 'submit' && type !== 'reset' && type !== 'button';
+        return type !== 'menu' &&
+            type !== 'submit' &&
+            type !== 'reset' &&
+            type !== 'button';
     }
 
     return 'value' in value;

test.js

@@ -728,6 +728,24 @@ test('hastscript', function (t) {
             'a button has a valid type'
         );
 
+        st.deepEqual(
+            h('button', {
+                'type': 'menu',
+                'value': 'Send'
+            }),
+            {
+                'type': 'element',
+                'tagName': 'button',
+                'properties': {
+                    'type': 'menu',
+                    'value': 'Send'
+                },
+                'children': []
+            },
+            'should *not* allow omitting `properties` when ' +
+            'a button has a valid type'
+        );
+
         st.deepEqual(
             h('button', {
                 'type': 'text',