294260 2025-06-10 07:55:11 -0700 Missing feature: implicit anchor (CSS anchor positioning) 2025-06-16 08:07:45 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 284226 294066 294112 291856 1 una.kravets koivisto bfulgham fantasai.bugs kiet.ho koivisto rik simon.fraser zalan oldest_to_newest 2122732 0 una.kravets 2025-06-10 07:55:11 -0700 Safari 26's implementation of anchor positioning is missing a key feature: [implicit anchoring](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_anchor_positioning/Using#implicit_anchor_association). This is critical DX for popovers and other commonly anchored UI elements. Implicit anchoring means users do not need to explicitly give each popover and invoking button an anchor name and position-anchor. Adding all of these additional styles muddles up HTML, and isn't reasonable to maintain in websites with many anchored elements. Please add this feature to Safari's implementation of anchor positioning to align with the [HTML specification](https://html.spec.whatwg.org/multipage/popover.html) and [CSSWG Draft](https://www.w3.org/TR/css-anchor-position-1/#implicit)! 2122761 1 rik 2025-06-10 09:59:09 -0700 @fantasai: I'm marking this as blocking css-anchor-position-1 since I agree with its importance. I'm not involved in the implementation so I'm just doing that to raise awareness. 2122862 2 kiet.ho 2025-06-10 15:32:05 -0700 There have been work to implement this: * https://bugs.webkit.org/show_bug.cgi?id=284226 * https://bugs.webkit.org/show_bug.cgi?id=294112 * https://bugs.webkit.org/show_bug.cgi?id=294066 I can't comment when they'll be available in STP or Safari in iOS/macOS 26 though. 2123613 3 fantasai.bugs 2025-06-13 15:08:30 -0700 Fixed by Antti in the dependencies. 2123956 4 una.kravets 2025-06-16 08:07:45 -0700 Awesome, thanks for your work on this :)