SideNote

Annotation/Blog Comment that is associated with a specific Paragraph (Paragraph Addressable), and appears next to it in the Margin.

cf Node Web

Often used in 3rd party Annotation Systems.

• Live Fyre http://blog.livefyre.com/say-hello-to-sidenotes/
• http://sidenotes.co/ https://github.com/sidenotes/sidenotes

Can do them for your own Thinking Space

• Medium
• Comment Press
• http://acdlite.github.io/jquery.sidenotes/

Sidenotes For Web Design · Gwern.net (Gwern Branwen)

Comparison of sidenotes implementations for web pages

Similar approaches (some of these are more limited than Tufte-CSS; typically, authors fail to handle narrow/mobile):

(2019-10-04) Nielsen Matuschak How Can We Develop Transformative Tools For Thought: 2019 (mobile: floating footnotes)