<label>
<input type='radio' bind:group='selected' value='red'>
red
</label>
<label>
<input type='radio' bind:group='selected' value='green'>
green
</label>
<label>
<input type='radio' bind:group='selected' value='blue'>
blue
</label>
<p style='color: {selected};'>selected {selected}</p>
xxxxxxxxxx
{
"selected": "blue"
}