Version: 55.0.2868.0 (Developer Build) (64-bit)
Revision: c25b23acf5c133b941ee35cb7a0e32b1e539dfbd-refs/heads/master@{#420151}
OS: Linux

What steps will reproduce the problem?
(1) With experimental web platform features enabled, visit http://output.jsbin.com/wuwelap
(2) Scroll down / up.

What is the expected output?
The bottom sticky element has "bottom: 0" so it should be touching the bottom of the viewport with no gap.

What do you see instead?
There is a single pixel gap between it and the bottom of the viewport.

Please use labels and text to provide additional information.