Use geographic personalization as a convenience
Country rules can help display regional programs, events, currencies, local contact information, resources, or donation instructions. IP-based location is not a verified home address and may be affected by travel, VPNs, corporate networks, borders, or shared connections.
Use geographic content to improve relevance, not to block access to essential information.
Treat browser language as a signal, not a confirmed preference
Language variations can offer translated headings, sections, resources, instructions, or links to fully translated pages. Always provide a visible language switcher.
Translation should be reviewed by someone who understands the language, program, cultural context, accessibility, local terminology, and legal or consent requirements.
Use device rules to improve usability, not replace responsive design
Device variations might shorten copy, simplify a mobile CTA, offer click-to-call, increase button size, reduce complexity, provide a desktop preview, or offer a mobile-friendly registration path.
The default page must still work across mobile, tablet, desktop, screen sizes, keyboard navigation, and assistive technology.