diff --git a/src/trix/core/helpers/custom_elements.js b/src/trix/core/helpers/custom_elements.js
index 5273fe63b..1e0fc5734 100644
--- a/src/trix/core/helpers/custom_elements.js
+++ b/src/trix/core/helpers/custom_elements.js
@@ -20,7 +20,8 @@ const insertStyleElementForTagName = function(tagName) {
 const getCSPNonce = function() {
   const element = getMetaElement("trix-csp-nonce") || getMetaElement("csp-nonce")
   if (element) {
-    return element.getAttribute("content")
+    const { nonce, content } = element
+    return nonce == "" ? content : nonce
   }
 }