Issues

• Apply Modern Web Guidance tooling to primer/react to see what we can safely update

  reactstaff
  Task

  primer/react#8741 · Filter by author joshblack opened on Nov 12, 2026
  1

• Breadcrumbs: overflow calculation never terminates for a single crumb in a very narrow container (page hangs)

  bug
  primer/react#8739 · Filter by author MattFor opened on Nov 11, 2026
  1

• Add support for performance lint rule on :is() and :where() selectors to prefer single argument

  reactstaff
  Task

  primer/react#8735 · Filter by author joshblack opened on Nov 10, 2026

• [Batch] Automate common tasks within primer/react

  reactstaff
  primer/react#8726 · Filter by author joshblack opened on Nov 9, 2026
  1

• Button: replace :has([data-kbd-chord]) with a data attribute set from React

  enhancement
  primer/react#8724 · Filter by author mattcosta7 opened on Nov 9, 2026

• Remove unused hsluv and react-intersection-observer dependencies

  enhancement
  primer/react#8723 · Filter by author mattcosta7 opened on Nov 9, 2026

• ThemeProvider: stop bundling the legacy JS theme with the root entry

  enhancementnext major
  primer/react#8722 · Filter by author mattcosta7 opened on Nov 9, 2026

• React Compiler: enable remaining overlay, list and focus files

  enhancement
  primer/react#8721 · Filter by author mattcosta7 opened on Nov 9, 2026

• useMedia, useResponsiveValue: share MediaQueryList instances and listeners

  enhancement
  primer/react#8720 · Filter by author mattcosta7 opened on Nov 9, 2026

• IconButton, Tooltip: reduce per-instance cost of the built-in tooltip

  enhancement
  primer/react#8719 · Filter by author mattcosta7 opened on Nov 9, 2026

• TreeView: focusing a parent item re-renders its expanded subtree

  enhancement
  primer/react#8718 · Filter by author mattcosta7 opened on Nov 9, 2026

• SelectPanel, FilteredActionList: typing re-renders every item

  enhancement
  primer/react#8717 · Filter by author mattcosta7 opened on Nov 9, 2026

• DataTable: toggling one row's selection re-renders every cell

  enhancement
  primer/react#8716 · Filter by author mattcosta7 opened on Nov 9, 2026

• DataTable: TableBulkActions re-creates a MutationObserver on document.body every render

  enhancement
  primer/react#8715 · Filter by author mattcosta7 opened on Nov 9, 2026

• Add repeatable performance benchmarks for list, tree and button stress cases

  enhancement
  primer/react#8714 · Filter by author mattcosta7 opened on Nov 9, 2026

• useAnchoredPosition: skip re-renders when the overlay position is unchanged

  enhancement
  primer/react#8713 · Filter by author mattcosta7 opened on Nov 9, 2026
  

• Performance audit: prioritized fixes for render cost, listener leaks, and bundle weight

  enhancement
  primer/react#8676 · Filter by author mattcosta7 opened on Nov 4, 2026

• Spinner: accessible name is set on an aria-hidden SVG and there is no status live region

  bugneeds triage
  primer/react#8652 · Filter by author adityalenova opened on Oct 31, 2026
  3

• UnderlineNav: loading counter pulses regardless of prefers-reduced-motion

  primer/react#8651 · Filter by author adityalenova opened on Oct 31, 2026
  1

  

• Tooltip: fade-in ignores prefers-reduced-motion, and gating it naively hides the bubble

  primer/react#8650 · Filter by author adityalenova opened on Oct 31, 2026
  

• AvatarStack: hover expansion animates regardless of prefers-reduced-motion

  primer/react#8649 · Filter by author adityalenova opened on Oct 31, 2026

• Checkbox: checkmark animation ignores prefers-reduced-motion

  primer/react#8646 · Filter by author adityalenova opened on Oct 31, 2026

• SkeletonAvatar size and shape depend on stylesheet load order

  bugcomponent: SkeletonAvatarcomponent: SkeletonBoxreactstaff
  primer/react#8627 · Filter by author joshblack opened on Oct 27, 2026
  1

• Button: scale default icon visuals to balance with small button labels

  component: Buttondesign-polishfigma
  Feature

  primer/react#8620 · Filter by author donjo opened on Oct 26, 2026
  4

  

• Conditional tooltips make the trigger lose focus

  bug
  primer/react#8571 · Filter by author lumaxis opened on Oct 19, 2026
  4