Introduction

Advanced HTML forms give you more control, validation, structure, and UX improvements. This tutorial covers datalists, fieldsets, custom validations, file inputs, pattern rules, and form events.

1. Fieldset + Legend (Grouping)

  

    
Personal Info

    Name:
    

    Email:
    
  

    

2. Datalist (Autocomplete)

3. Input Pattern (Regex Validation)

• Only letters
• Min 3, max 10 characters

4. File Inputs (Single + Multiple)

5. Date & Time Controls

6. Range Slider

7. Color Picker

8. Required, Min, Max, Step

9. Custom Error Messages

10. Form Events

  
  Send




    

11. FormData API (JS)

  
  
  Submit




    

12. Disabling/Enabling Fields

Toggle
    

13. Readonly vs Disabled

• readonly submits with form
• disabled does NOT submit

14. Real Multi-step Form (Simple)

  
  Next



  
  Finish




    

15. Summary

• Fieldsets help structure complex forms
• Datalists create auto-complete inputs
• Patterns = client-side regex validation
• File inputs, ranges, color pickers = rich UX controls
• Custom validation improves form quality
• JavaScript FormData handles data cleanly
• Multi-step forms improve onboarding