Web platform features explorer - Anchor positioning

Anchor positioning places an element based on the position of another element. For example, you can place a tooltip next to the content it references.

Status

Limited availability

MDN documentation

CSS anchor positioning

Specifications

CSS Anchor Positioning (#anchoring), from Cascading Style Sheets (CSS) Working Group (W3C).

Browser support (view on caniuse.com)

Chrome 125 Released on 2024-05-14
Chrome Android 125 Released on 2024-05-14
Edge 125 Released on 2024-05-17
Firefox ❌ See bugzil.la/1909339 bugzil.la/1838746 bugzil.la/1924231 Vendor position : positive
Firefox for Android ❌ See bugzil.la/1909339 bugzil.la/1838746 bugzil.la/1924231 Vendor position : positive
Safari 26 Released on 2025-09-15
Safari on iOS 26 Released on 2025-09-15

Baseline availability blocked since September 2025 by Firefox (2 months)

Developer signals

State of HTML 2025: usage/html_interoperability_features question
State of HTML 2025: usage/html_functionality_features question
State of HTML 2024: usage/html_interoperability_features question
State of HTML 2023: usage/html_interoperability_features question
State of CSS 2025: usage/gamechanger_feature question
State of CSS 2025: usage/favorite_new_features question
State of CSS 2025: usage/css_missing_features question
State of CSS 2025: usage/css_interoperability_features question
State of CSS 2025: usage/css_general_pain_points question
State of CSS 2025: shapes_graphics/shapes_graphics_pain_points question
State of CSS 2025: reading_list/reading_list question
State of CSS 2025: other_features/other_features_pain_points question
State of CSS 2025: layout/layout_pain_points question
State of CSS 2025: interactions/interactions_pain_points question
State of CSS 2025: features/all_features question
State of CSS 2024: usage/favorite_new_features question
State of CSS 2024: usage/css_missing_features question
State of CSS 2024: usage/css_interoperability_features question
State of CSS 2024: reading_list/reading_list question
State of CSS 2024: features/all_features question

Usage (according to Chrome Platform Status)

~0.305% of page loads. More data at chromestatus.com.

Interop

Included in Interop 2025

Web Platform Tests (WPT)

View the latest WPT test results for this feature

Developer signals

Votes: 13

If you want this feature to be available in all browsers, vote for it by adding a thumbs up reaction (👍) to this GitHub issue, and leave a comment with more information.

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