Html Form Validation Attrs — Free Html Tutorial
Learn Html Form Validation Attrs in Html with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Html Form Validation Attrs in Html with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Html Form Validation Attrs in Html
HTML5 validation: required (mandatory), minlength/maxlength, min/max, pattern (regex), email auto-validates, number auto-validates.
Validation happens before form submission. Invalid inputs show browser default error messages.
pattern attribute uses regular expressions: [0-9]{10} for 10 digits, [A-Z]{2}[0-9]{3} for codes.
Html Form Validation Attrs — Syntax
<input type="text" minlength="3" maxlength="20" required>
<input type="email" required>
<input type="number" min="0" max="100">
<input type="tel" pattern="[0-9]{10}">
<input type="text" pattern="[A-Z]{2}[0-9]{3}" title="Format: AB123">
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