While in theory the form-associated API is the right™ choice, its current support is limited (only Chrome). However it is not so hard, to support Submit, Reset interaction of CustomElements. You simply grab your closest()<form> (and of course piercing any ShadowDOM you might encounter) and then simply listen for Submit or Reset events and act accordingly:
reset your components to some initial state for a reset
add your hidden inputs mirroring your serialized data to the DOM of the aforementioned form either on submit or, simply synchronize them on every change
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While in theory the form-associated API is the right™ choice, its current support is limited (only Chrome). However it is not so hard, to support Submit, Reset interaction of CustomElements. You simply grab your
closest()<form>(and of course piercing any ShadowDOM you might encounter) and then simply listen for Submit or Reset events and act accordingly: