Form Attributes
📌 Covered in this chapter:
Form Attributes · required, readonly, disabled · min, max, step · minlength, maxlength · pattern (Regex) · autocomplete & multiple · accept file filters
Welcome to Phase 7 (Chapter 18): Form Attributes! Master HTML5 form validation constraints:
required, pattern Regex, min/max, minlength/maxlength, autocomplete, and accept file filters.
1Form Attributes Constraint Syntax
HTML — Constraint Attributes Example
▶ Run in HTML Editor
<!-- Zip code regex: exactly 5 digits -->
<input type="text" pattern="[0-9]{5}" title="Please enter 5 digit zip code" required>
<!-- File upload restricted to images only -->
<input type="file" accept="image/*" multiple>