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Paul BakausandClaude Opus 4.6
6e12f215c8
jsdom's CSSOM silently drops any border shorthand containing var(), leaving the computed style empty — which hid the canonical real-world side-tab pattern (border-left: Npx solid var(--brand)) from the Node detector path. Real browsers resolve var() natively, so this only affected the jsdom path. Add a pre-pass that walks the stylesheets, reads border shorthands off rule.style (jsdom preserves them there even when it drops them from cssText), resolves var() against :root custom properties via the documentElement's computed style, and attaches the result to a per- element override map. checkElementBorders consults the map whenever jsdom returned an empty width, or substitutes a resolved color when jsdom kept a literal var() string. Hex and named colors are normalized to rgb() so isNeutralColor can classify them correctly — without that, --line:#e5e7eb slipped through as non-neutral. Adds four flag cases and three pass cases to modern-color-borders.html covering shorthand, mixed neutral+colored, border-right, card-shaped label, neutral-resolving var, thin var, and uniform all-sides var. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>