Autoprefixer processing comment to locally turn off grid polyfill continues to report IE related warnings

[rjgotten]

Given the following snippit of CSS

.usps > ul {
  display : flex; 
  // ...
}

@supports(grid-template-columns: repeat(auto-fit, minmax(200px, max-content))) {
  .usps > ul {
    /* autoprefixer grid: off */
    display               : grid;
    grid-gap              : 20px 10px;
    grid-template-columns : repeat(auto-fit, minmax(200px, max-content));
    justify-content       : center;
  }
}

Even though it is using the /* autoprefixer grid: off */ processing comment, this particular block continues to raise a warning that " IE does not support justify-content on grid containers ." when conditionally applying grid styling.

Elevating the processing comment to the scope of the @supports block itself yields the same result. It continues to report warnings related to IE's grid implementation. Only using /* autoprefixer: off */ in these places works as expected.

While that suffices in the current situation for my problem, it is highly non-desired that the entirety of Autoprefixer has to be turned off. This would start causing problems once these rules end up containing properties which do need prefixing, requiring that e.g. an artificially split CSS rule be maintained where autoprefixer can still be turned off.

Autoprefixer version : 9.8.4

[ai]

Thanks for the issue.

Do you want to send a pull request to save your name in the project history? You will need to add this.gridStatus(decl, result) check before the warning.

[rjgotten]

@ai
Nah; I'm good as is. I just filed the issue; you actually found the fix. 👍
(Plus, I'm a bit pre-occupied currently in keeping other plates spinning, so to say.)

[ai]

I will be able to fix it only after a few weeks. Too much work too.

[rjgotten]

When it rains it pours, right? ;)

Anyway; the current work-arounds I have will hold for the short term, so a few weeks is fine.
(A quick guessstimate is that a few weeks would be the time window before I could start on a PR as well.)

If for some reason I find the time to work on it sooner, can I notify you through this issue?

[ai]

I am preparing PostCSS 8 right now. This release could take 2-4 weeks.

[ai]

The fix was released in 9.8.5.