We need to create a toolbar in the demo page for OOJS UI which has same menus as VE toolbar. So it's easier to visualize the the OOJS UI changes in VE.
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The one added in https://gerrit.wikimedia.org/r/#/c/197441/ should be close enough. It's already live on http://tools.wmflabs.org/oojs-ui/oojs-ui/demos/#toolbars-mediawiki-vector-ltr.