![ckeditor5 MentionCustomization Cannot read property 'createAttributeElement' of undefined - Stack Overflow ckeditor5 MentionCustomization Cannot read property 'createAttributeElement' of undefined - Stack Overflow](https://i.stack.imgur.com/bNYQ5.png)
ckeditor5 MentionCustomization Cannot read property 'createAttributeElement' of undefined - Stack Overflow
![The mention list should highlight the last item when the list is displayed above the text. · Issue #4644 · ckeditor/ckeditor5 · GitHub The mention list should highlight the last item when the list is displayed above the text. · Issue #4644 · ckeditor/ckeditor5 · GitHub](https://user-images.githubusercontent.com/247363/55540284-f5dc2400-56c2-11e9-84c0-2f1f822928d0.png)
The mention list should highlight the last item when the list is displayed above the text. · Issue #4644 · ckeditor/ckeditor5 · GitHub
markerToHighlight should mention how to apply highlight on custom containers · Issue #8864 · ckeditor/ckeditor5 · GitHub
![Create a CKEditor plugin to select and embed a media item from the Media Library [#2994699] | Drupal.org Create a CKEditor plugin to select and embed a media item from the Media Library [#2994699] | Drupal.org](https://www.drupal.org/files/issues/2019-06-28/2994699-13%20selected%20media.png)