There are some cases where the available native HTML form controls may seem like they are not enough. For example, if you need to perform advanced styling on some controls such as the <select> element, or if you want to provide custom behaviors, you may consider building your own controls.
Enquiry Form – Mykademy
Product Update- Enrich Client Onboarding with Custom forms
Web Forms: The Ultimate Guide
The 11 best online form builder apps
WPForms - The World's Best Drag & Drop WordPress Forms Plugin
How to Set Up a Custom Pop-up Form
How to Submit a Form with JavaScript – JS Submit Button Example
Basic native form controls - Learn web development
How to Create HTML Forms – Tutorial with Examples - Shiksha Online
Creating Custom Form Controls with ElementInternals