After applying the reflow, Docs page navigation controls overlap the main navigation controls: A11y_Typespec_Reflow.

[kupatkar99]

Please do not close this bug. This bug should only be closed by TCS, C+AI Accessibility tester after bug verification.
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GitHub Tags:

#A11yTCS; A11yMAS; #A11ySev2; #DesktopWeb; #Win11; #Chrome; # E2E_TypeSpec_Web_May2026; #WCAG1.4.10; # TypeSpec; #Reflow; #A11yWCAG2.1;

Issue Subcategory:

Content hidden at narrow widths.

User Experience:

Critical content or functionality disappears when zoomed in, leaving users without needed information or controls. There is no fallback to access the hidden content.

Pre Requisites:

Open DevTools using Ctrl+Shift+I and set it to undocked window → Minimize DevTools → Apply reflow by either setting viewport to 320px width at 200% zoom OR set OS resolution to 1280×1024 with 100% scaling and zoom browser to 400% in full screen.

Repro Steps:

Launch url https://typespec.io/docs/>Get started.

Actual Result:

When reflow is applied (e.g., zoom or reduced viewport width), the Docs page navigation controls overlap the main navigation controls. This causes layout issues and prevents proper interaction with the main navigation.

Expected Result:

Navigation elements should reflow properly without overlapping, ensuring all controls remain visible and usable.

How to Fix:

Ensure all content reflows rather than hiding. Use a mobile-first design approach where content stacks vertically. If collapsing navigation, provide a hamburger menu or equivalent.

Environment details:

Application Name: TypeSpec
URL: typespec.io
Edition Windows 11 Enterprise
Version 25H2 OS build 26200.8390
Chrome Version 148.0.7778.168 (Official Build) (64-bit)

Attachment:

A11y_Typespec_Reflow.mp4

[github-actions]

🎯 Issue Triage

A WCAG 1.4.10 (Reflow) accessibility bug on typespec.io/docs: when the viewport is narrowed to 320px (or the browser is zoomed to 400%), the sidebar/docs page navigation overlaps the main navigation bar, breaking layout and usability.

Category: Bug

Area: meta:website

🔍 Analysis

• WCAG criterion: 1.4.10 Reflow — content must be available without horizontal scrolling at 320px width.
• Affected page: (typespec.io/redacted) started (docs section)
• Root cause: The docs sidebar and main nav likely use fixed or absolute positioning without proper z-index/stacking context or lack a responsive breakpoint that hides/collapses one of the navs at narrow widths.
• Severity: Accessibility Severity 2 (A11ySev2) per the reporter — blocks keyboard/screen reader navigation in reflow mode.
• Fix direction: Ensure navigation components use mobile-first responsive CSS; add a hamburger/drawer pattern for the sidebar at narrow viewports; verify no overflow: hidden clips are hiding the conflict.

📝 Suggested next steps

• Reproduce locally by setting viewport to 320px in DevTools on /docs/
• Audit the docs layout CSS for fixed-width or absolute positioning on the sidebar nav
• Add a responsive breakpoint that collapses the sidebar into a drawer/hamburger at ≤320px
• Verify fix with Accessibility Insights or browser DevTools reflow simulation

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