Simon Willison’s Weblog

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19th February 2026

Tool Contact form — Submit contact information through this form that demonstrates client-side validation using only HTML5 and CSS. The form validates required fields, email addresses, phone numbers, and message length in real-time as users interact with inputs, displaying visual feedback with checkmarks for valid entries and error indicators for invalid ones. No JavaScript processing occurs—this is a demonstration of modern web standards for form validation without backend submission.

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This is a beat by Simon Willison, posted on 19th February 2026.

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