CHAPTER · 4 lessons

Forms Deep Dive

Four lessons on the form layer real apps live and die by — HTML5 Constraint Validation, mobile keyboard hints + autocomplete, accessible error patterns, and file inputs with previews.

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Your journey through this chapter

1. HTML5 Constraint Validation API

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2. Mobile Keyboards, autocomplete, and inputmode

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3. Accessible Form Errors — aria-describedby & live regions

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4. File Inputs — Previews, Drag-and-Drop, FormData

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