Required, Pattern, and Other Validation Attributes

HTML validation attributes help ensure users enter correct data:

• required: makes a field mandatory;
• pattern: defines a regex pattern for input (such as phone numbers);
• min, max: set numeric or date limits;
• minlength, maxlength: control text length.

These attributes provide instant feedback and reduce errors.

Browsers automatically check validation rules and display error messages if input is invalid. This improves user experience and reduces server-side errors.

Write clear patterns and validation rules. For example, use pattern="[0-9]{10}" for a 10-digit phone number. Always provide helpful error messages.