Update BlockUI.d.ts

components/lib/blockui/BlockUI.d.ts

@@ -31,6 +31,10 @@ export interface BlockUIPassThroughOptions {
      * Used to pass attributes to the root's DOM element.
      */
     root?: BlockUIPassThroughOptionType;
+    /**
+     * Used to pass attributes to the mask's DOM element.
+     */
+    mask?: BlockUIPassThroughOptionType;
     /**
      * Used to manage all lifecycle hooks
      * @see {@link BaseComponent.ComponentHooks}