JSFiddle - React, Tailwind, and code Playground
HTML
<form>
<input name="test[]" type="checkbox" required />
<input name="test[]" type="checkbox" required />
<input name="test[]" type="checkbox" required />
<input type="submit" value="Submit" required />
</form>
<form>
<input name="test[]" required />
<input name="test[]" />
<input name="test[]" />
<input type="submit" value="Submit" />
</form>