Working on cards.

lib/bundle.js

@@ -20,6 +20,9 @@ import {Cycle, Colors, Elements, Angle, Dates, Points, Polygon, Rect, Sets, Stri
 import UITest from './uitest.js'
 
 import {CardWrapper} from './card/wrapper.js'
+import {Highlight} from './card/highlight.js'
+
+
 /* Needed to ensure that rollup.js includes class definitions and the classes
 are visible inside doctests.
 */
@@ -84,4 +87,5 @@ window.debounce = debounce
 window.randomInt = randomInt
 window.randomFloat = randomFloat
 
-window.CardWrapper = CardWrapper
+window.CardWrapper = CardWrapper
+window.Highlight = Highlight