According to this API Usage list, 0% of the scanned sites use the little known "padding" css property. Did someone double check this before publishing?
The others have it: "padding" is one of many so-called "shorthand properties", and the data does in fact indicate usage of the actual (non-shorthand) properties for each of them.
I actually worked on this project. This is just an issue with how browsers give back the parsed data (which is what it is reporting, rather than the authored styles). This is covered in the FAQ - https://developer.microsoft.com/en-us/microsoft-edge/platfor...
Just to remember you: Low usage of a CSS property, or an API, does not mean no one wants to use it. It can simply mean, that people just cant use it, because of missing browser support
