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anchored-auto-layout

v1.0.0

Published

A zero-JS, HTML-first CSS utility library mapping CSS Anchor Positioning to an iOS Auto Layout-style data-⚓️-* attribute API.

Vulnerabilities

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Links

Git

Maintainers

argyleinkargyleink

Keywords

csscss-anchor-positioninganchor-positioningpopovertooltipdropdownlayoutauto-layoutzero-jsutility-css

Readme

⚓️ anchored-auto-layout

Zero-JS, HTML-first CSS for CSS Anchor Positioning, with an iOS Auto Layout-style data-⚓️-* attribute API. No ResizeObservers, no portals, no z-index wars.

Install

npm i anchored-auto-layout
@import "anchored-auto-layout";        /* readable source */
@import "anchored-auto-layout/min";    /* minified */

Or link the file directly: node_modules/anchored-auto-layout/anchored-auto-layout.css.

Use

<button data-⚓️-name="--btn" popovertarget="tip">Hover me</button>
<div id="tip" popover data-⚓️-to="--btn" data-⚓️-below data-⚓️-sync-width>
  Anchored below the button, same width.
</div>

data-⚓️-to picks the anchor; modifiers like below, above, before, after, align-*, stretch-*, fill, and sync-width position and size the target relative to it.

What ships

  • anchored-auto-layout.css, dist/anchored-auto-layout.min.css: the library
  • SPEC.md: full attribute reference and known browser limitations
  • anchored-auto-layout.html-data.json: VS Code autocomplete data (html.customData)
  • llms.txt: context file for LLM assistants

Browser support

Requires CSS Anchor Positioning (Chromium 125+, Safari 26+). See SPEC.md for limitations.

License

MIT