The float label pattern
http://bradfrost.com/blog/post/float-label-pattern/ Brad Frost explores the pros and cons of floating labels.
Floating labels are problematic
https://medium.com/simple-human/floating-labels-are-a-badidea-82edb64220f6 Adam Silver takes a deep dive into potential user experience issues with floating labels.
Are float labels really that problematic after all?
https://medium.com/@mds/are-float-labels-really-thatproblematic-after-all-da7ffe7d5417 Matt Smith, the inventor of floating labels, explains where floating labels can be useful, and how they can add value if done well.