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.

Well, it has >93% usage for padding-left, padding-right, padding-bottom, padding-top.

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...

even no `margin`, `background`..etc. I guess it counts as separated property.

padding: 0 15px 20px 30px; = padding-top:0; padding-right: 15px padding-bottom: 20px padding-left: 30px