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Add guidelines for CSS support data

docsIssues or pull requests regarding the documentation of this project.Issues or pull requests regarding the documentation of this project.

enhancementNice to have features.Nice to have features.

p1Highest priority – Should be addressed in the next few releases.Highest priority – Should be addressed in the next few releases.

Status: Open.

#28913 In mdn/browser-compat-data;

· caugner opened on Jan 26, 2026

api.Translator - Edge Support Missing

data:apiCompat data for Web APIs. https://developer.mozilla.org/docs/Web/APICompat data for Web APIs. https://developer.mozilla.org/docs/Web/API

p3Medium priority – Community PRs encouraged.Medium priority – Community PRs encouraged.

Status: Open.

#28839 In mdn/browser-compat-data;

· allout58 opened on Jan 15, 2026

css.types.timeline-range-name - Missing compatibility data

data:cssCompat data for CSS features. https://developer.mozilla.org/docs/Web/CSSCompat data for CSS features. https://developer.mozilla.org/docs/Web/CSS

meeting agendaIssues or pull requests in need of discussion in a project meeting.Issues or pull requests in need of discussion in a project meeting.

needs collector testNeeds a custom BCD collector testNeeds a custom BCD collector test

Status: Open.

#28838 In mdn/browser-compat-data;

· estelle opened on Jan 15, 2026

Linter doesn't complain about unnecessary <code>ie: { "version_added": false }</code> statements

linterIssues or pull requests regarding the tests / linter of the JSON files.Issues or pull requests regarding the tests / linter of the JSON files.

Status: Open.

#28837 In mdn/browser-compat-data;

· caugner opened on Jan 15, 2026

Disallow consecutive partial_implementation statements on same track

linterIssues or pull requests regarding the tests / linter of the JSON files.Issues or pull requests regarding the tests / linter of the JSON files.

meeting agendaIssues or pull requests in need of discussion in a project meeting.Issues or pull requests in need of discussion in a project meeting.

Status: Open.

#28823 In mdn/browser-compat-data;

· caugner opened on Jan 14, 2026

css.properties.position-area / css.types.anchor() - animating not supported in Firefox

data:cssCompat data for CSS features. https://developer.mozilla.org/docs/Web/CSSCompat data for CSS features. https://developer.mozilla.org/docs/Web/CSS

Status: Open.

#28805 In mdn/browser-compat-data;

· jakearchibald opened on Jan 13, 2026

svg.global_attributes.lang - does not consider automatic selection of sibling elements

data:svgCompat data for SVG features. https://developer.mozilla.org/docs/Web/SVGCompat data for SVG features. https://developer.mozilla.org/docs/Web/SVG

info neededThis needs more information to review or act on.This needs more information to review or act on.

needs browser bug

Status: Open.

#28804 In mdn/browser-compat-data;

· Crissov opened on Jan 13, 2026

[meta] Permissions-Policy issues

spamJunk issues/PRs, 'nuff said.Junk issues/PRs, 'nuff said.

Status: Open.

#28797 In mdn/browser-compat-data;

· caugner opened on Jan 12, 2026

api.Selection.addRange - data doesn't note that multiple ranges are only supported in Firefox

data:apiCompat data for Web APIs. https://developer.mozilla.org/docs/Web/APICompat data for Web APIs. https://developer.mozilla.org/docs/Web/API

Status: Open.

#28742 In mdn/browser-compat-data;

· wbamberg opened on Dec 28, 2025

css.types.random - Add support data for <code>random()</code>

data:cssCompat data for CSS features. https://developer.mozilla.org/docs/Web/CSSCompat data for CSS features. https://developer.mozilla.org/docs/Web/CSS

Status: Open.

#28736 In mdn/browser-compat-data;

· romainmenke opened on Dec 26, 2025

css.types.color.color-mix - Add support data for variadic argument list

data:cssCompat data for CSS features. https://developer.mozilla.org/docs/Web/CSSCompat data for CSS features. https://developer.mozilla.org/docs/Web/CSS

Status: Open.

#28732 In mdn/browser-compat-data;

· romainmenke opened on Dec 26, 2025

until-found should be listed as a separate row in the BCD table

data:apiCompat data for Web APIs. https://developer.mozilla.org/docs/Web/APICompat data for Web APIs. https://developer.mozilla.org/docs/Web/API

Status: Open.

#28719 In mdn/browser-compat-data;

· connorshea opened on Dec 20, 2025