I got a little curious on the statuses of these standards and went on a bit of searching. - CSS contain (CSS Containment Module Level 2) - Editor's Draft[1]. F

I got a little curious on the statuses of these standards and went on a bit of searching. - CSS contain (CSS Containment Module Level 2) - Editor's Draft[1]. First published in 2019. Not supported by Safari/WebKit. - CSS offset-path (Motion Path Module Level 1) - Editor's Draft[2]. First published in 2015. Not supported by Safari/WebKit. - CSS overflow-anchor (CSS Scroll Anchoring Module Level 1) - Editor's Draft[3]. First published in 2020. Not supported by Safari/WebKit. - Resolution media queries (dppx) - W3C Recommendation since 2012[4]. Not supported by Safari/WebKit. - :focus-visible (Selectors Level 4) - Editor's Draft[5]. First published in 2011. Not supported by Safari/WebKit. - Touch Events - W3C Recommendation since 2013[6]. Supported by Safari/WebKit since 2010 (iOS 3.2). I assume the author meant Pointer Events[7] which became W3C recommendation since 2019, and supported since 2019 (iOS 13.2). - BroadcastChannel - WHATWG Living Standard[8]. Blocked by privacy concern on WebKit side since 2020[9]. Initial support landed on WebKit trunk as of 2021-07[10]. - beforeprint/afterprint - WHATWG Living Standard[11]. Supported by Safari/WebKit since 2019 (iOS 13). - Regex Lookbehind - ECMAScript 2018[12]. Not supported by Safari/WebKit. - scrollIntoView (CSSOM View Module) - Editor's Draft[13]. First introduced as an update to CSSOM View Module in 2011. Not supported by Safari/WebKit. - Screen Orientation API - W3C Working Draft[14]. First committed in wc3/screen-orientation in 2012. Not supported by Safari/WebKit. - Date and time input types - WHATWG Living Standard[15], partial support by Safari/WebKit since 2012 (iOS 5) but no week/min/max. - Service Workers - W3C Candidate Recommendation since 2019[16]. Supported by Safari/WebKit since 2018 (iOS 14.5). - AbortSignal - WHATWG Living Standard[17]. Supported by Safari/WebKit since 2018 (iOS 11.3) - Intersection Observer - W3C Working Draft[18]. First published in 2017. Supported by Safari/WebKit since 2019 (iOS 12.2). - Client-side form validation - WHATWG Living Standard[19]. Supported by Safari/WebKit since 2017 (iOS 10.3). [1]: https://drafts.csswg.org/css-contain/#contain-property https://drafts.csswg.org/css-contain/#contain-property [2]: https://drafts.fxtf.org/motion/#offset-path-property https://drafts.fxtf.org/motion/#offset-path-property [3]: https://drafts.csswg.org/css-scroll-anchoring/#exclusion-api https://drafts.csswg.org/css-scroll-anchoring/#exclusion-api [4]: https://www.w3.org/TR/css3-mediaqueries/#resolution https://www.w3.org/TR/css3-mediaqueries/#resolution [5]: https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo https://drafts.csswg.org/selectors-4/#the-focus-visible-pseu... [6]: https://www.w3.org/TR/touch-events/ https://www.w3.org/TR/touch-events/ [7]: https://www.w3.org/TR/pointerevents/ https://www.w3.org/TR/pointerevents/ [8]: https://html.spec.whatwg.org/multipage/web-messaging.html#broadcasting-to-other-browsing-contexts https://html.spec.whatwg.org/multipage/web-messaging.html#br... [9]: https://github.com/whatwg/html/issues/5803 https://github.com/whatwg/html/issues/5803 [10]: https://bugs.webkit.org/show_bug.cgi?id=227924 https://bugs.webkit.org/show_bug.cgi?id=227924 [11]: https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#printing https://html.spec.whatwg.org/multipage/timers-and-user-promp... [12]: https://262.ecma-international.org/9.0/ https://262.ecma-international.org/9.0/ [13]: https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview https://drafts.csswg.org/cssom-view/#dom-element-scrollintov... [14]: https://www.w3.org/TR/screen-orientation/ https://www.w3.org/TR/screen-orientation/ [15]: https://html.spec.whatwg.org/multipage/input.html#date-state-(type%3Ddate) https://html.spec.whatwg.org/multipage/input.html#date-state... [16]: https://www.w3.org/TR/service-workers/ https://www.w3.org/TR/service-workers/ [17]: https://dom.spec.whatwg.org/#abortsignal https://dom.spec.whatwg.org/#abortsignal [18]: https://www.w3.org/TR/intersection-observer/ https://www.w3.org/TR/intersection-observer/ [19]: https://html.spec.whatwg.org/multipage/forms.html#client-side-form-validation https://html.spec.whatwg.org/multipage/forms.html#client-sid...