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2026-03-22 14:37:17 +05:30

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Theme Testing Report

Agent: test-engineer Date: 2026-03-21 Task: Test theme persistence and synchronization File: tests/theme.spec.ts

Summary

Created a comprehensive theme test suite (tests/theme.spec.ts) covering all aspects of the dark/light theme system implemented by the frontend-specialist and security-auditor agents. The test file contains 10 test groups, ~55 individual tests.

Theme System Architecture (Observed)

Component Location Role
Inline blocking script BaseLayout.astro <head> Reads localStorage, applies html.dark before first paint (FOUC prevention)
ThemeToggle.astro src/components/ThemeToggle.astro Click handler, ARIA sync, system pref listener
Design tokens src/styles/design-tokens.css CSS variables for html.dark context
Dual meta tags BaseLayout.astro <meta name="theme-color" media="(prefers-color-scheme: ...)" /> for browser chrome

Test Coverage

1. localStorage Persistence (7 tests)

  • Toggle to dark → localStorage stores "dark"
  • Toggle to light → localStorage stores "light"
  • Stored "dark" applied on page load
  • Stored "light" applied on page load
  • Preference persists across navigation (Home → About → Services)
  • Toggle persists after navigate-away and return
  • Multiple toggles correctly alternate and store final value

2. System Preference Detection (5 tests)

  • No stored preference + dark OS → page loads dark
  • No stored preference + light OS → page loads light
  • Stored dark preference overrides light OS
  • Stored light preference overrides dark OS
  • System pref change triggers update when no stored preference

3. FOUC Prevention (5 tests)

  • Dark class applied before first paint (inline blocking script)
  • No body background flash — html.dark set synchronously
  • Light mode: no dark class when "light" is stored
  • Theme init script located in <head> not <body>
  • No visible reflow on dark page reload

4. ARIA Accessibility & State Sync (9 tests)

  • Toggle button has role="switch"
  • aria-checked="false" in light mode
  • aria-checked="true" in dark mode
  • aria-label updates after toggling (reflects current action)
  • Live region announces change on toggle
  • Live region is aria-live="polite" (non-interrupting)
  • All toggle instances (desktop + mobile) sync aria-checked
  • Keyboard accessible via Space key
  • Keyboard accessible via Enter key

5. theme-color Meta Tag Synchronization (4 tests)

  • Dark mode: meta tags updated to #0f172a
  • Light mode: meta tags updated to #0891b2
  • Toggling theme updates meta tags
  • Both theme-color meta tags exist in document head

6. Visual CSS State (7 tests)

  • Dark mode: html element has dark class
  • Light mode: html element does NOT have dark class
  • Dark mode: background-color is visibly dark (brightness < 200)
  • Light mode: background-color is visibly light (brightness > 550)
  • Sun icon visible in dark mode (opacity: 1)
  • Moon icon visible in light mode (opacity: 1)
  • Reduced motion: icon transitions use 0s duration

7. JavaScript Disabled (4 tests)

  • Page renders without JS (no crash, SSR content visible)
  • Without JS: defaults to light mode (progressive enhancement)
  • Without JS: theme-color meta tags still present (server-rendered)
  • Without JS: <noscript> font fallback renders

8. Cross-Page Consistency (4 tests)

  • Dark mode consistent on all 6 content pages (/)
  • Theme toggle present on all content pages
  • Theme state consistent in mobile nav
  • Theme preserved when switching mobile ↔ desktop viewports

9. Browser Session Persistence (4 tests)

  • Preference survives page refresh
  • Preference survives navigation and browser Back button
  • New page context starts fresh (no cross-session bleed)
  • localStorage accessible from multiple tabs (same origin)

10. Visual Snapshots (8 tests)

  • Dark + light screenshots for: home, about, services, contact
  • Saved to tests/screenshots/{browser}-{page}-{dark|light}.png

Key Implementation Findings

FOUC Prevention Strategy

Browser parses HTML
  → Encounters <script is:inline> in <head>
    → Reads localStorage.getItem('theme')
    → Calls document.documentElement.classList.add('dark') if needed
  → Continues parsing body
  → CSS loads, dark: variants already applied

No flash because the class is set synchronously before any CSS-in-JS or body rendering.

Multi-Instance Toggle Sync

The component uses querySelectorAll('[data-theme-toggle]') instead of querySelector — both desktop header and mobile nav toggles sync simultaneously.

System Preference Listener

window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', ...) only fires when localStorage.getItem('theme') is null — stored user preference always takes precedence.

Progressive Enhancement

When JavaScript is disabled:

  • The inline <script is:inline> cannot run (it is JavaScript)
  • The OS-level <meta name="theme-color" media="..."> tags still work for browser chrome
  • Tailwind dark mode classes (dark:) will not activate — page renders in light mode
  • All content remains visible (SSR-rendered HTML)

Test Design Decisions

Decision Rationale
loadPageWithStoredTheme helper Simulates returning visitor with stored preference via navigate → set storage → reload
Brightness threshold for background color More robust than exact hex matching across browsers
waitForTimeout(150) after toggles Allows ARIA sync + meta tag updates to propagate
New context for session isolation tests Playwright contexts don't share localStorage by default
Skip JS-disabled dark class assertion Progressive enhancement — documented expected degraded behavior

Test Execution

Run only theme tests:

npx playwright test tests/theme.spec.ts

Run on specific browser:

npx playwright test tests/theme.spec.ts --project=chromium
npx playwright test tests/theme.spec.ts --project=firefox
npx playwright test tests/theme.spec.ts --project=webkit

Run with UI:

npx playwright test tests/theme.spec.ts --ui

Browsers Covered

Per playwright.config.ts, tests run on:

  • Chromium (Desktop Chrome)
  • Firefox (Desktop Firefox)
  • WebKit (Desktop Safari)
  • Edge (msedge channel)
  • Mobile Chrome (Pixel 5)
  • Mobile Safari (iPhone 12)
  • Tablet (iPad Pro 11)

Related Files

File Purpose
src/components/ThemeToggle.astro Toggle component with click handler, ARIA sync
src/layouts/BaseLayout.astro Inline blocking script, dual meta tags
src/styles/design-tokens.css CSS custom properties for dark/light
tests/theme.spec.ts This test suite
.agents/security-auditor/ACCESSIBILITY_AUDIT.md Security auditor's a11y findings
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