Add more input types, fix lowercase nodeName, support shift-backspace

go-back-with-backspace/is_editable.js

 // Determine whether focus is in an editable text field.
 function isEditable(path) {
   var target = path[0];
 
   // Elements may be explicitly marked as editable.
   if (target.isContentEditable)
     return true;
 
-  // Several types of input fields are editable, but not all (e.g., checkboxes).
-  var nodeName = target.nodeName;
-  var nodeType = target.type;
+  // Many types of input fields are editable, but not all (e.g., checkboxes).
+  var nodeName = target.nodeName.toUpperCase();
+  var nodeType = target.type || '';
+  nodeType = nodeType.toLowerCase();
   if (nodeName === 'TEXTAREA' ||
       (nodeName === 'INPUT' && (nodeType === 'text' ||
-                                nodeType === 'email' ||
-                                nodeType === 'number' ||
                                 nodeType === 'password' ||
                                 nodeType === 'search' ||
-                                nodeType === 'tel'))) {
+                                nodeType === 'date' ||
+                                nodeType === 'datetime' ||
+                                nodeType === 'datetime-local' ||
+                                nodeType === 'email' ||
+                                nodeType === 'month' ||
+                                nodeType === 'number' ||
+                                nodeType === 'tel' ||
+                                nodeType === 'time' ||
+                                nodeType === 'url' ||
+                                nodeType === 'week'))) {
     return true;
   }
 
   // Certain CSS styles, on elements or their parents, also indicate editable
   // fields.
   var pathLength = path.length;
   for (var i = 0; i < pathLength; ++i) {
     target = path[i];
     if (target.nodeType == 1) { // Only Elements have computed styles.
       var userModify = getComputedStyle(path[i])['-webkit-user-select'];
       if (userModify == 'read-write' || userModify == 'write-only')
         return true;
     }
   }
   return false;
 }