text-scale によるユーザ指定倍率での文字拡大
Read OriginalOSの文字拡大設定がWebコンテンツに必ずしも反映されない問題を解決するための標準化の取り組みを解説。WCAG基準、iOSのDynamic Type、そして新たに提案されているCSSの`preferred-text-scale`環境変数や`pem`単位について、各ブラウザの実装状況やアクセシビリティの観点から詳細に説明しています。
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