Add css-anchor-position-2

[browser-specs-bot]

URL

https://drafts.csswg.org/css-anchor-position-2/

Rationale

• See repository: w3c/csswg-drafts
• Would-be shortname: css-anchor-position-2

Additional properties

{
  "seriesComposition": "delta"
}

[browser-specs-bot]

Changes to index.json

This update would trigger the following changes in index.json:

Add spec (1)

{
  "url": "https://drafts.csswg.org/css-anchor-position-2/",
  "seriesComposition": "delta",
  "shortname": "css-anchor-position-2",
  "series": {
    "shortname": "css-anchor-position",
    "currentSpecification": "css-anchor-position-1",
    "title": "CSS Anchor Positioning",
    "shortTitle": "CSS Anchor Positioning",
    "releaseUrl": "https://www.w3.org/TR/css-anchor-position/",
    "nightlyUrl": "https://drafts.csswg.org/css-anchor-position/"
  },
  "seriesVersion": "2",
  "seriesPrevious": "css-anchor-position-1",
  "organization": "W3C",
  "groups": [
    {
      "name": "Cascading Style Sheets (CSS) Working Group",
      "url": "https://www.w3.org/groups/wg/css/"
    }
  ],
  "nightly": {
    "url": "https://drafts.csswg.org/css-anchor-position-2/",
    "status": "Editor's Draft",
    "alternateUrls": [
      "https://w3c.github.io/csswg-drafts/css-anchor-position-2/"
    ],
    "repository": "https://github.com/w3c/csswg-drafts",
    "sourcePath": "css-anchor-position-2/Overview.bs",
    "filename": "index.html"
  },
  "title": "CSS Anchor Positioning Level 2",
  "source": "spec",
  "shortTitle": "CSS Anchor Positioning 2",
  "categories": [
    "browser"
  ],
  "standing": "good",
  "tests": {
    "repository": "https://github.com/web-platform-tests/wpt",
    "testPaths": [
      "css/css-anchor-position"
    ]
  }
}

Update spec in the same series (1)

{
  "url": "https://www.w3.org/TR/css-anchor-position-1/",
  "seriesComposition": "full",
  "shortname": "css-anchor-position-1",
  "series": {
    "shortname": "css-anchor-position",
    "currentSpecification": "css-anchor-position-1",
    "title": "CSS Anchor Positioning",
    "shortTitle": "CSS Anchor Positioning",
    "releaseUrl": "https://www.w3.org/TR/css-anchor-position/",
    "nightlyUrl": "https://drafts.csswg.org/css-anchor-position/"
  },
  "seriesVersion": "1",
  "seriesNext": "css-anchor-position-2",
  "organization": "W3C",
  "groups": [
    {
      "name": "Cascading Style Sheets (CSS) Working Group",
      "url": "https://www.w3.org/groups/wg/css/"
    }
  ],
  "release": {
    "url": "https://www.w3.org/TR/css-anchor-position-1/",
    "status": "Working Draft",
    "filename": "Overview.html"
  },
  "nightly": {
    "url": "https://drafts.csswg.org/css-anchor-position-1/",
    "status": "Editor's Draft",
    "alternateUrls": [
      "https://w3c.github.io/csswg-drafts/css-anchor-position-1/",
      "https://w3c.github.io/csswg-drafts/css-anchor-position/"
    ],
    "repository": "https://github.com/w3c/csswg-drafts",
    "sourcePath": "css-anchor-position-1/Overview.bs",
    "filename": "index.html"
  },
  "title": "CSS Anchor Positioning",
  "source": "w3c",
  "shortTitle": "CSS Anchor Positioning",
  "categories": [
    "browser"
  ],
  "standing": "good",
  "tests": {
    "repository": "https://github.com/web-platform-tests/wpt",
    "testPaths": [
      "css/css-anchor-position"
    ]
  }
}

Tests

These changes look good! 😎

Crawl results for CSS Anchor Positioning Level 2

Crawl summary:

• Title: CSS Anchor Positioning Level 2
• Authoring tool: bikeshed
• Date: 2 September 2025
• Revision ID: f3b5a761525457b4519dda8452a25e2582d8a820
• Canonical URL: https://drafts.csswg.org/css-anchor-position-2/
• Spec defines:
  • CSS: 1 at-rule, 2 values
  • Headings: 26 found
  • IDs: 179 found
  • Links: 20 rawlinks, 10 autolinks
  • References: 8 normative, 3 informative
  • Terms: 5 exported by default
• No Algorithms, CDDL, Events, Web IDL definitions found

1 CSS at-rule

• @container (xref search)

[tidoust]

This delta spec extends the <query-in-parens> type, using ... | to reference the base syntax. Reffy misses the extension (or rather it reports it as a "Missing definition" warning). That is probably a good thing for now as it does not know how to handle the ....

[tidoust]

@browser-specs-bot pr