Also, the other browsers may have launched a little too early while some weird spec corner cases were getting worked out. All of that got worked out a while ag

Also, the other browsers may have launched a little too early while some weird spec corner cases were getting worked out. All of that got worked out a while ago; you can read the CSSWG notes and check the bug trackers for WebKit, Firefox and Chrome. It’s not that WebKit, which shipped :has() back in March, was too early but Mozilla had some difficulties with their implementation [1]. It took Google (and Igalia) until the end of August to ship their implementation in Chrome 105 [2]. Even though web developers have been asking for this for nearly 20 years, it only recently got figured out. Based on Apple’s article [3] and Igalia's prototyping document [4], this is easily the most complex CSS selector that’s ever been implemented. I would cut Mozilla some slack. [1]: https://bugzilla.mozilla.org/show_bug.cgi?id=418039 https://bugzilla.mozilla.org/show_bug.cgi?id=418039 [2]: https://developer.chrome.com/blog/new-in-chrome-105/ https://developer.chrome.com/blog/new-in-chrome-105/ [3]: https://webkit.org/blog/13096/css-has-pseudo-class/ https://webkit.org/blog/13096/css-has-pseudo-class/ [4]: https://github.com/Igalia/explainers/blob/main/css/has/prototyping-details.md https://github.com/Igalia/explainers/blob/main/css/has/proto...