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Re: [csswg-drafts] [css-pseudo] clarify paired-cascading behavior (#6386)

From: Delan Azabani via GitHub <sysbot+gh@w3.org>
Date: Thu, 29 Jul 2021 10:23:24 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-888997679-1627554202-sysbot+gh@w3.org>
> A bit of work went into cleaning up the previous "specified/modified by the author" mess we had related to disabling of appearance:auto. We have sane behavior there now which is basically: any value except `revert` (but including `unset`) counts as "specified by the author". We should stick to the same here.

To expand on this, after discussing it with @andruud: in Blink, we decided to treat unset as author-specified when rendering non-disregarded properties for widgets with native appearance (auto), at least in part because it gives authors the option of setting something to inherit-or-initial, which might be different to the UA stylesheet and/or native appearance. This is distinct from revert, where we would roll back to UA defaults (or user styles, if any).

While none of that is really specified behaviour, we thought the choice made more sense there, and we’re primarily trying to avoid a situation where we have two different concepts of “specified by the author/non-UA” with subtle differences.

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