Holloway Additions
Some users have rules to write additions in the guide. When we hover on some paragraph on the right side we can see a bubble with 3 icons: Add an addition, Share via Twitter and add this paragraph to your bookmarks.
Full case: https://medium.com/@maxkalik/holloway-ui-concept-vol-01-b171b3c27a78
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About Holloway
Holloway is a new type of publishing company. They publish fully digital Guides to high-stakes, complex subjects. The titles and the product are created by experts and designed to improve with community contribution over time.