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api.ReadableStream - Incorrect iOS + Safari availability

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

p2High priority – Community PRs highly encouraged.High priority – Community PRs highly encouraged.

Status: Open.

#29708 In mdn/browser-compat-data;

· katlyn-edwards opened on May 19, 2026

webextensions.api.menus.ContextType - Chrome 150 added "tab" support

data:webextCompat data for Browser Extensions. https://developer.mozilla.org/Add-ons/WebExtensionsCompat data for Browser Extensions. https://developer.mozilla.org/Add-ons/WebExtensions

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

Status: Open.

#29704 In mdn/browser-compat-data;

· Juraj-Masiar opened on May 19, 2026

svg.elements.textPath - <Missing lengthAdjust data>

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.

Status: Open.

#29670 In mdn/browser-compat-data;

· Hamham6 opened on May 13, 2026

Use NodeBB JSON API instead of RSS for Opera release detection

infraInfrastructure issues (npm, GitHub Actions, releases) of this projectInfrastructure issues (npm, GitHub Actions, releases) of this project

Status: Open.

#29658 In mdn/browser-compat-data;

· caugner opened on May 12, 2026

api.Element.requestFullscreen — WKWebView support differs from Safari data

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

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

Status: Open.

#29654 In mdn/browser-compat-data;

· janbrasna opened on May 11, 2026

css.types.basic-shape.circle - Values closest-corner and farthest-corner are not supported by some browsers yet

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

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

Status: Open.

#29634 In mdn/browser-compat-data;

· SebastianZ opened on May 8, 2026

Fixer does not report "Marked as standard_track, but missing required spec_url"

infraInfrastructure issues (npm, GitHub Actions, releases) of this projectInfrastructure issues (npm, GitHub Actions, releases) of this project

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.

#29615 In mdn/browser-compat-data;

· caugner opened on May 6, 2026

api.Document.ariaNotify - Firefox should also be marked as partial

acdAccessibility Compatibility DataAccessibility Compatibility Data

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.

#29610 In mdn/browser-compat-data;

· captainbrosset opened on May 5, 2026

javascript.builtins.String.substr - No spec level deprecation

javascriptPull requests that update javascript codePull requests that update javascript code

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

Status: Open.

#29608 In mdn/browser-compat-data;

· saschanaz opened on May 5, 2026

Survey existing data conventions for method parameters, especially parameter objects

good first issueGood issues for getting started with this project.Good issues for getting started with this project.

help wantedYou're encouraged to pick up this issue, a maintainer will come back to you and review your work.You're encouraged to pick up this issue, a maintainer will come back to you and review your work.

Status: Open.

Task

#29572 In mdn/browser-compat-data;

· ddbeck opened on Apr 29, 2026

Popover - Safari breaks browser convention in how it translates popover components to screen-readers

acdAccessibility Compatibility DataAccessibility Compatibility Data

needs browser bug

Status: Open.

#29566 In mdn/browser-compat-data;

· lolaodelola opened on Apr 29, 2026

css.at-rules.supports.at-rule - missing compat data for @supports at-rule()

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

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

Status: Open.

#29549 In mdn/browser-compat-data;

· 3ru opened on Apr 27, 2026