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+---
+title: Updates to the Anchor Position Polyfill
+sub: Catching up to the spec
+date: 2024-06-26
+image:
+  src: blog/2024/anchor.jpg
+  alt: >
+    A rusty anchor hanging from a board.
+author: james
+oss: true
+tags:
+  - Article
+  - OSS
+  - Anchor Position
+  - CSS
+summary: |
+  Support for updates to the Anchor Position Spec
+  is making the Anchor Position Polyfill more useful.
+---
+A couple years ago, OddBird started working on a polyfill for Anchor Position,
+as the spec started to take form. Now that the spec has stabilized, and Chromium
+has begun implementation, we are relying on our sponsors to support development
+of the polyfill. Thanks to their contributions, we're releasing [v0.0.6].
+
+[v0.0.6]: https://github.com/oddbird/css-anchor-positioning/releases/tag/v0.0.6
+
+## Updates in v0.0.6
+
+1. `position-anchor`
+
+In their full form, anchor functions can get quite verbose and repetitive.
+
+
+```css
+#target{
+  top: anchor(--my-anchor bottom);
+  width: anchor-size(--my-anchor width);
+}
+```
+
+`position-anchor` allows you to specify a default anchor for an element.
+
+```css
+#target{
+  position-anchor: --my-anchor;
+  top: anchor(bottom);
+  width: anchor-size(width);
+}
+```
+
+You can also use this to share positioning rules while using different anchors.
+Both Target A and Target B will be positioned to the right of their anchor, but
+they will use their own anchors.
+
+```css
+.target{
+  left: anchor(right);
+}
+.target#a{
+  position-anchor: --anchor-a;
+}
+.target#b{
+  position-anchor: --anchor-b;
+}
+```
+
+`position-anchor` will also be useful for things like [`inset-area`], which
+isn't yet supported by the Polyfill.
+
+[`inset-area`]: https://drafts.csswg.org/css-anchor-position-1/#inset-area
+
+2. Anchor validity
+
+Thanks to a great contribution from [@ayoreis], the validity algorithm has been
+updated to match the [spec]. More can be found in the [issue], but this change
+makes more elements available for anchoring. The notable use case is you can now
+anchor to another element that is anchored as well (as long as it comes earlier
+in the DOM tree).
+
+[@ayoreis]: https://github.com/ayoreis
+[spec]: https://drafts.csswg.org/css-anchor-position-1/#target
+[issue]: https://github.com/oddbird/css-anchor-positioning/issues/103
+
+3. Support multiple names in `anchor-name`.
+
+In this example, both `#target-a` and `#target-b` are referring to the same
+element, but with different names.
+
+```css
+.anchor {
+  anchor-name: --a, --b;
+}
+
+#target-a {
+  position-anchor: --a;
+}
+
+#target-b {
+  position-anchor: --b;
+}
+```
+
+This will enable a number of use cases, for instance if you want `#target-b` to
+have a different anchor on a different screen size.
+
+```css
+@media (min-width: 768px){
+  .anchor#side-anchor{
+    anchor-name: --b;
+  }
+}
+```
+
+## What's next?
+
+While a lot of the basic functionality is already possible with the polyfill,
+there's a lot left to do to bring the Polyfill up to date with the spec. Our
+[v1.0.0 Milestone] is prioritized based on what we think will be the most
+impactful and useful features, and some of the upcoming ones are-
+
+[v1.0.0 Milestone]: https://github.com/oddbird/css-anchor-positioning/milestone/1
+
+- [#91] Applying the Polyfill to dynamic elements
+- [#167] Position Fallback
+- [#180] Anchor Scope
+- [#181] Support for `inset-area`
+
+[#91]: https://github.com/oddbird/css-anchor-positioning/issues/91
+[#167]: https://github.com/oddbird/css-anchor-positioning/issues/167
+[#180]: https://github.com/oddbird/css-anchor-positioning/issues/180
+[#181]: https://github.com/oddbird/css-anchor-positioning/issues/181
+
+If you're as eager as I am to use these features, there's a few ways you can
+help. First, let us know which features you're most eager to see supported by
+commenting on the GitHub issues. We also welcome PRs.
+
+And of course, [sponsoring] OddBird's Open Source work is a great way to help
+make our continued work on this polyfill and other work possible. We're grateful
+for our existing sponsors who have made this release possible, and you can see
+them below.
+
+[sponsoring]: https://opencollective.com/oddbird-open-source
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