A Developer's Guide to Building Fast Bilingual Websites with RTL and LTR Support

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Building a bilingual website supporting both English and Arabic requires more than simple string translation, as interface direction, typography, and component layout must all adapt accordingly. Developers are advised to set both the lang and dir attributes on the root HTML element and use CSS logical properties like padding-inline and margin-inline-start to avoid directional bugs. Components should receive translated content externally rather than hardcoding language-specific text, and flexible sizing should be used to accommodate varying string lengths across languages. Font selection is critical, with separate typefaces recommended for Latin and Arabic scripts, and only essential font weights should be preloaded to manage performance. For SEO and caching, each language version should have its own distinct URL, such as /en/ and /ar/ paths, rather than relying on JavaScript to swap visible language on a single URL.

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