perf: フォント preload 無効化とバッジコントラスト解消(Lighthouse 改善 第2弾)#17
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- next/font は日本語フォントを subset 指定できず全120スライス(2.1MB)を preload するため preload: false に。実際に描画するグリフのスライスだけが unicode-range 経由でロードされる - primary を oklch(0.55 0.17 38) に微調整し、ヒーローバッジの背景を bg-primary/5 に変更(バッジ 4.71:1 / ボタン白文字 5.15:1 で WCAG AA 達成) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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概要
PR #16 の続き。再計測で残った2つの原因への対処。
変更
preload: false— next/font は日本語フォントの subset 指定ができず、全120スライス(2.1MB)をrel=preloadで強制ダウンロードしていた(モバイル LCP 14.9s の主因)。無効化により、実際に描画するグリフのスライスだけが CSS の unicode-range 経由でロードされる。ビルド後 HTML からフォント preload が消えたことを確認済みbg-primary/10のバッジ背景も濃くなり 4.2:1 で唯一の未達に。primary をoklch(0.55 0.17 38)に微調整(視覚的にほぼ不変)+ バッジ背景をbg-primary/5に変更し、バッジ 4.71:1 / ボタン白文字 5.15:1 / ページ背景 5.05:1 で WCAG AA を余裕を持って達成(数値は WCAG 相対輝度で算出)検証
pnpm check/pnpm buildexit 0.next/server/app/index.htmlにフォントの preload リンクが 0 件🤖 Generated with Claude Code