WIP.

src/highlightediting.js

@@ -8,6 +8,7 @@
  */
 
 import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
+import AttributeElement from '@ckeditor/ckeditor5-engine/src/view/attributeelement';
 
 import HighlightCommand from './highlightcommand';
 
@@ -107,9 +108,14 @@ function _buildDefinition( options ) {
 
 	for ( const option of options ) {
 		definition.model.values.push( option.model );
-		definition.view[ option.model ] = {
-			name: 'mark',
-			classes: option.class
+		definition.view[ option.model ] = ( modelAttributeValue, viewWriter ) => {
+			if ( modelAttributeValue !== option.model ) {
+				return null;
+			}
+
+			const attributes = { priority: AttributeElement.DEFAULT_PRIORITY + 5 };
+
+			return viewWriter.createAttributeElement( 'mark', { class: option.class }, attributes );
 		};
 	}