diff --git a/service.js b/service.js
index 699eb4d..ae038aa 100644
--- a/service.js
+++ b/service.js
@@ -364,7 +364,12 @@ class BesService {
    * @returns true if editable; false otherwise
    */
   isContentEditable() {
-    return this.hostElement.contentEditable !== 'false'
+    switch (this.hostElement.contentEditable) {
+      case 'true':
+      case 'plaintext-only':
+        return true
+    }
+    return false
   }
 
   /**