CSS note

<input id="rad1" type="radio" name="rad"><label for="rad1">Radio 1</label>
<input id="rad2" type="radio" name="rad"><label for="rad2">Radio 1</label>
<style>
input[type="radio"]{
	visibility:hidden;
}
input[type="radio"]:checked+label{ font-weight: bold; } 
</style>

example

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