This feature is experimental. Please share your experiences so we know what to keep or change.
Constructs a new up.Params instance from one or more
HTML form fields.
The constructed up.Params will include exactly those form values that would be
included for the given fields in a regular form submission. If a given field wouldn't
submit a value (like an unchecked <input type="checkbox">), nothing will be added.
See up.Params.fromForm() for more details and examples.
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