Phase 8 — Responsive, Accessibility, and Performance Audit

Phase 8 — Responsive, Accessibility, and Performance Audit

Audit date: 2026-09-06

Viewport evidence

Viewport Full-page screenshot Result
1440px desktop docs/baseline/phase-8-desktop-1440.png No horizontal overflow; scene and editorial grid render correctly
1280px desktop docs/baseline/phase-8-desktop-1280.png No horizontal overflow; long research titles remain readable
768px tablet docs/baseline/phase-8-tablet-768.png Scene switches from sticky two-column layout to stacked layout
390px mobile docs/baseline/phase-8-mobile-390.png Navigation collapses; scene, evidence, publications, and links remain readable

The browser audit reported equal scrollWidth and clientWidth at all four widths, with no page errors or console errors.

Accessibility checks

  • Semantic header, nav, main, section, figure, ol, article, and footer landmarks are retained.
  • Skip link, visible :focus-visible states, keyboard-focusable links/buttons, and mobile-menu Escape close/focus return are implemented.
  • All six homepage images have alt text and explicit width/height attributes; the decorative scene context image has an intentionally empty alt.
  • The unified SVG includes a title and description; the adjacent six-step text remains the primary readable explanation.
  • The scene buttons expose aria-pressed, and the mobile navigation exposes aria-expanded / aria-controls.
  • prefers-reduced-motion: reduce removes reveal transforms and scene transitions.

Lighthouse (local production build)

Run against the local Jekyll production server on 2026-09-06:

Category Score
Performance 100
Accessibility 100
Best Practices 100
SEO 100

Observed metrics: CLS 0, LCP 1.58s. The page uses one small native JS file, no frontend framework, local system fonts, lazy-loaded non-hero images, and explicit image dimensions.

Phase 8 acceptance

All required viewport and accessibility checks pass locally. No score-driven content removal was required.