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Home page Lighthouse fixes; SEO.md: PageSpeed Insights and Search Console findings - #35
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- LiveMapHero: the hero's picture of the Overview / Detailed toggle was
aria-hidden but its buttons stayed focusable ("ARIA hidden element must
not be focusable", also Agentic Browsing's agent accessibility check).
It is now inert.
- ScrollFx: steps not reached yet faded to .38, so their numbers, titles
and body text measured 1.8-3.1:1. The muted body text needs >= .82 on
the night page for 4.5:1; inactive steps now sit at .85.
- next.config: productionBrowserSourceMaps (Lighthouse "missing source
maps for large first-party JavaScript"; the code is open source).
- SEO.md: PageSpeed Insights in the measurement checklist, section 11b
(accessibility fixes agents and Lighthouse check), origin-trial steps,
the parent-domain favicon lesson, change log through this PR.
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Summary
Fixes the accessibility and best-practice failures Lighthouse reports on the home page, and brings
SEO.mdup to date. This replaces #34: it contains #34's commit.aria-hidden, but its buttons could still be tabbed toinerton the decorative copy (LiveMapHero.tsx)ScrollFx.module.css).productionBrowserSourceMaps: true. The code is open source, so nothing is exposed.SEO.mdchanges:Not in this PR: the home page performance items (render-blocking requests, 4.2 s of main-thread work, 317 KiB of unused JavaScript). They need before-and-after measurements.
Test plan
tscclean; eslint clean on the changed files; landing and design-guard tests pass/: no contrast oraria-hidden-focusfailures, and source maps present