Inputs in dropdown are not accessible via keyboard nav

[mwargan]

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Describe the issue

Cannot tab into and select radio or checkboxes with keyboard when they are in a dropdown.

Current Behavior

Tabs to the next dropdown, skips content inside altogether.

Expected Behavior

To correctly tab

Reproduction URL

https://picocss.com/docs/dropdown

Suggested fix

I've added a tabindex to my inputs inside the dropdown. It feels wrong though, just because inputs natively have a tabindex=0 set.