That’s what it does, and that’s wrong. Unspecified properties are not equivalent to 0. Example of code that this tool breaks: p { margin: 10px;

That’s what it does, and that’s wrong. Unspecified properties are not equivalent to 0. Example of code that this tool breaks: p { margin: 10px; } aside p { margin-left: 0; margin-right: 0; } This is turned into `aside p {margin: 0}` and that’s not what the authored CSS meant at all.