<input type="radio" name="shirtsize" value="S"/>Small <input type="radio" name="shirtsize" value="M"/>Medium <input type="radio" name="shirtsize" value="L" checked="checked"/>Large <input type="radio" name="shirtsize" value="XL"/>Extra large
<input type="checkbox" name="toppings" value="mushrooms" checked="checked"/>Mushrooms <input type="checkbox" name="toppings" value="anchovies" />Anchovies
toppings=mushrooms+toppings=anchovies