Fix value-no-vendor-prefix for -webkit-box

[ybiquitous]

Which issue, if any, is this issue related to?

Closes stylelint/stylelint#6372

Is there anything in the PR that needs further explanation?

No, it's self-explanatory.

[jeddy3]

LGTM.

This can be a patch release as it makes the config more permissive.

[ybiquitous]

This can be a patch release as it makes the config more permissive.

Thanks for your review. I agree. 👍🏼

[Mouvedia]

The -webkit-discard value behaves identically to discard, except that it only takes effect if the computed value of the display property on the parent is -webkit-box or -webkit-inline-box and the computed value of the -webkit-box-orient property on the parent is vertical.

Then shouldn't we add inline-box as well?

[ybiquitous]

@Mouvedia Good catch. Can you please open a new pull request to add inline-box?

[Mouvedia]

@ybiquitous I would if I could include -webkit-inline-box but exclude -moz-inline-box.
I don't know how to do that using ignoreValues.

[ybiquitous]

@Mouvedia Indeed, the current rule implementation cannot do it. But that's also true for -moz-box, so inline-box would be acceptable.

If users hope more strict checks, they can override the config like this:

{
  "extends": ["stylelint-config-standard"],
  "rules": {
    "value-no-vendor-prefix": true
  }
}