Social share buttons

Removing Social Sharing Buttons Increases Conversions. Yes, You Heard That Right! http://web.archive.org/web/20160906132300/http://exisweb.net:80/truth-about-share-buttons No Share Buttons On Mobile Sites (except This One Weird Case)

https://developers.google.com/web/updates/2016/10/navigator-share

Back to top buttons

http://www.nngroup.com/articles/learn-more-links/

Text-resize buttons

http://idlewords.com/talks/website_obesity.htm