content(accessibility): add Forced colours mode page#50
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New page documenting the `forced-colors` media feature (CSS Media Queries Level 5) and `forced-color-adjust` (CSS Color Adjustment Module Level 1) — how to repair UI that Windows High Contrast and similar palettes flatten, without overriding the user's choice. Status: recommended (forced colours works automatically for semantic markup; this is about not breaking it, so the platform contract does not break without it). Baseline: widely available since Sept 2022. Wires relatedSlugs on colour-contrast, reduced-motion, and color-scheme; adds changelog entry and count-driven OG images. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What changed
New spec page: Forced colours mode under
accessibility. Documents theforced-colorsmedia feature andforced-color-adjustproperty — how to repair UI that a forced palette (Windows High Contrast and similar) flattens, using CSS system colour keywords, without overriding the user's choice.relatedSlugsoncolor-contrast,reduced-motion, andcolor-scheme.changelogentry (added).npm run buildpasses (146 pages indexed). SKILL.md uses a soft "140+ pages" figure that's still accurate, so no digest change.Why now
Found by the daily standards scan. It's a genuine coverage gap: we cover
prefers-reduced-motion, colour contrast, andcolor-scheme, but nothing on forced colours — the mode some low-vision and light-sensitive users depend on.Primary sources
forced-colorsforced-color-adjustforced-colorsStatus:
recommendedForced colours works automatically for semantic markup; this page is about not breaking it and repairing the few places a palette erases a colour-only distinction. The platform contract doesn't break without it, so it's
recommended, notrequired. Baseline: widely available since Sept 2022 (verified via MDN — the MDN MCP server was not connected this run, so this was checked via MDN directly).🤖 Generated with Claude Code