[cixzhang]

User impact

Someone sliding a mouse across TopNavMenu's action items (items with an onClick and no href), which it tracks as a held pointer since #8791, selected the item text. The selection stayed after the lift. Link items never selected text. With this change, action items select none either.

Change

• userSelect: 'none' on TopNavMenu's menu. Its menu holds only its own items, so no caller content is affected.
• A new Action Items TopNavMenu story, because no story had items without destinations.
• A real-Chromium case in NavMenusSlideSelection.a11y.chromium.spec.ts (fix(core): a mouse slide across NavHeadingMenu or TabMenu items selects no text #8802). A mouse presses the first action item's title and slides to the second; nothing may be selected while held or after the lift.
• A patch changeset.

Evidence

Chrome 156, the built Storybook with the new story:

• Main without the fix: the case fails, with "Invite teammates" selected while held and after the lift.
• This head: it passes, and the spec's other four cases pass too.

Authority

family:action-groups FR1–FR2 (the slide is the gesture) and component:TopNavMenu FR11. CodeBunny noted this on #8802 at a5b3d4b.

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Project	Deployment	Actions	Updated
astryx	Ready	Preview	Oct 28, 2026 12:50pm UTC

[astracat-bot]

AI review status for this pull request.

Review status	Updated
🟢 Reviewed (for maintainers only)	Oct 28, 2026, 1:23 PM UTC

[github-actions]

PR Analysis Report

📚 Storybook Preview

View Storybook for this PR

🧪 Sandbox Preview

View Sandbox for this PR

Component Size

Component	Import before	Import after	Delta	CSS before	CSS after	Delta
core/NavHeadingMenu	13.0KB	13.0KB	0B	3.3KB	3.3KB	0B
core/TopNav	52.5KB	52.5KB	0B	10.5KB	10.5KB	0B
core/TopNavHeading	58.6KB	58.6KB	0B	10.2KB	10.2KB	0B
core/TopNavItem	9.0KB	9.0KB	0B	3.8KB	3.8KB	0B
core/TopNavMegaMenu	55.0KB	55.0KB	0B	11.0KB	11.0KB	0B
core/TopNavMegaMenuFeaturedCard	6.7KB	6.7KB	0B	3.4KB	3.4KB	0B
core/TopNavMegaMenuItem	9.1KB	9.1KB	0B	4.1KB	4.1KB	0B
core/TopNavMenu	58.3KB	58.3KB	+15B	10.3KB	10.3KB	0B

Sizes are gzip. Import counts the JavaScript the import loads eagerly; CSS counts the package stylesheet rules referenced by the modules it can load from its own package, lazily loaded ones included.

Bundle Size Summary

Gzip figures measure each package's entry file, not the code an import pulls in.

Package	Entry (ESM)	Entry gzip before	Entry gzip after	Delta
@astryxdesign/core	4.9KB	1.2KB	1.2KB	0B

Package stylesheet	Gzip before	Gzip after	Delta
@astryxdesign/core	35.4KB	35.4KB	0B

Accessibility Audit

Status: No accessibility violations detected.

Visual Regression

55 of 506 shot(s) changed.

A change here is a question, not a failure: check whether the after is the
picture you intended. Record that review on the PR. Baseline maintenance is an
explicit dispatch of CI; this report never rewrites the baseline or adds a release gate.

component	story	theme	mode	pixels
Selector	Indicator Space Bottom Sheet Narrow End RTL	neutral	light	753,933
Selector	Indicator Space Bottom Sheet Wide Start	neutral	light	740,072
RichTextEditor	Markdown parity: side by side	probe	dark	558,840
RichTextEditor	Markdown parity: side by side	probe	light	540,756
Chat	Full AI Chat	probe	light	230,823
Chat	Full AI Chat	probe	dark	229,805
AppShell	With Mobile Nav	probe	light	217,010
AppShell	With Mobile Nav	probe	dark	216,960
Collapsible	Dividers	probe	dark	66,445
Collapsible	Dividers	probe	light	66,445
AppShell	Playground	neutral	dark	65,198
AppShell	Playground	neutral	light	63,788
Chat	Default	neutral	dark	36,304
Chat	Default	neutral	light	35,767
Chat	Empty State	probe	light	23,531
Chat	Empty State	probe	dark	22,622
ChatAutoScroll	Scroll Behavior Comparison	neutral	dark	15,378
ChatAutoScroll	Scroll Behavior Comparison	neutral	light	14,107
Chat	With Attachments	probe	light	13,406
Chat	With Attachments	probe	dark	11,232

and 35 more.

---

_{Generated by PR Enrichment workflow | Storybook | Sandbox | View full report}

[astracat-bot]

This looks ready to merge: userSelect: 'none' on TopNavMenu's menu stops a mouse slide across action items from selecting their text, matching the other menus, while the slide still acts once on the item it lifts on. The new Chromium case's slide leaves text selected without the fix and the case passes with it, so nothing else is needed.

[Automated review]