What is the standard behavior for deselecting radio buttons?

When working with radio buttons in HTML forms, once a radio button is selected, it cannot be deselected by clicking on it again. To allow for deselection, you can add an additional "None" option that users can select to clear the radio button selection. 

<form action="submit.php" method="post">
  <input type="radio" name="option" value="option1"> Option 1<br>
  <input type="radio" name="option" value="option2"> Option 2<br>
  <input type="radio" name="option" value="none"> None<br>
  <input type="submit" value="Submit">
</form>

Keywords

PHP radio buttons behavior deselecting standard

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