checked in radio button code example
Example 1: html radio button checked
<input type="radio" id="huey" name="drone" value="huey"
checked>
<!-- https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/radio-->
Example 2: checkbox as radio button
input[type=checkbox]:not(old) + label,
input[type=radio ]:not(old) + label{
display : inline-block;
margin-left : -2em;
line-height : 4em;
}