values of properties accepting properties should be always output prefixed.

[Stratos Moros]

Sorry for the confusing title but here is an example:

div {
    transition-property: filter;
}

This will output:

div {
    -webkit-transition-property: -webkit-filter, filter;
            transition-property: filter;
}

The result is that browsers that support transition-property and -webkit-filter will use the second declaration, thus not getting -webkit-filter.

The output should probably be:

div {
    -webkit-transition-property: -webkit-filter, filter;
            transition-property: -webkit-filter, filter;
}

since there is no guarantee that the same prefix is needed for both sides of the declaration.

[Andrey Sitnik]

Yeap. Ideally it should do so. But right now I have time for it. I am open for PR.

[Stratos Moros]

Thanks for your quick reply!

I'm afraid I'm not familiar with autoprefixer-core to open a PR. Shouldn't the issue remain open for someone else to fix?

[Andrey Sitnik]

I close it because there is no real issue here. It is only potential.