I recently realized that my Web Components in AgnosticUI were missing native form integration. Without Form-Associated Custom Elements (FACE), components often break standard browser behaviors like validation, resetting, and submission.
I just published a deep dive on Frontend Masters detailing how to use the ElementInternals interface to fix this. It’s the difference between a component that "looks" like a form field and one that actually is one in the eyes of the browser.
In this article, I cover:
✅ Why standard Web Components fail in forms.
✅ Implementing the ElementInternals interface.
✅ Handling validation, submission, and resets.
✅ Real-world implementation details from AgnosticUI.
Special thanks to Marc van Neerven for highlighting this gap!
Check out the full guide here:
https://frontendmasters.com/blog/form-associated-custom-elements-in-practice/
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