Topic: i18n
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Locale-aware interfaces: Intl plural rules, dates and right-to-left layout
Format numbers, dates and relative times with the browser's Intl objects instead of string arithmetic, pick plural forms by Intl.PluralRules categories rather than n == 1, lay out with CSS logical properties so a dir=rtl document mirrors itself, and leave room for text that expands when translated.
Machine-readable: JSON