explainers

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 [2]: https://developer.

I was neither sharing an opinion nor did I claim anything. I asked OP to elaborate and referred them to content of the article. > You know why it never happened? Yes, I do. > Especially when all we have is their word. Does that mean you don't trust their word? Good. Would you trust their own benchmark? No? The parent selector has been in Safari 15.4 since March, 2022. So feel free to do your own benchmark. There is not just their word. You might also find the lengthy explainer of Igalia, where performance is discussed, interesting: https://github.com/Igalia/explainers/tree/main/css/has Being skeptic is not a bad thing. But (uninformed) criticism without any specifics is far from "well founded skepticism". JavaScript interpreters used to be very slow twenty years ago, now they are extremely fast. That can happen to CSS evaluation, too.

True in the sense that you mean and alao in pure CS theory terms but also the TFA also links to some serious documentation on practical solutions to many real world performance problems and browser codebases have most of the underlying complexity for other less obvious performance issues. E.g. https://github.com/Igalia/explainers/blob/main/css/has/has-s...