Can you onblur a set of checkboxes?

I have a set of checkboxes, and validation such that at least one of those checkboxes need to be checked on submit. But I want to be able to set a validation error if the user blurs out of the set of checkboxes. The problem is that if I do a blur for the last one it doesn't work because they could be shift-tabbing to the second from last checkbox. I've tried to but the onblur in the fieldset tag, but that didn't trigger a blur at all. Is this just a limitation that can't be overcome with plain html and vanilla JS?

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