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

go-back-with-backspace/is_editable.js

Index: go-back-with-backspace/is_editable.js
diff --git a/go-back-with-backspace/is_editable.js b/go-back-with-backspace/is_editable.js
index 585aa4fa856968be03aff0afcf704fd936eccf04..d0e4114ebee40f58b60fb4a8a973e24391118a08 100644
--- a/go-back-with-backspace/is_editable.js
+++ b/go-back-with-backspace/is_editable.js
@@ -6,16 +6,24 @@ function isEditable(path) {
   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;
   }