radio buttons checked code example
Example 1: checked radio button css
<input id="rad1" type="radio" name="rad"/><label for="rad1">Radio 1</label>
<input id="rad2" type="radio" name="rad"/><label for="rad2">Radio 2</label>\
input[type="radio"]:checked+label { font-weight: bold; }
Example 2: html radio button checked
<input type="radio" id="huey" name="drone" value="huey"
checked>
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Example 3: radio by default selected
checked="checked"
Example 4: radio selected
<input type="radio" id="huey" name="drone" value="huey"
checked>