Is there a way to define a default value to be selected in an HTML Form of Radio Buttons?

Just set it as checked:

<body>
  <form>
    <input type="radio" name="amount" value="10"/> $10&#8194 
    <input type="radio" name="amount" value="25"/> $25&#8194 
    <input type="radio" name="amount" value="50" checked="checked" /> $50&#8194
    <input type="radio" name="amount" value="100"/> $100&#8194
    <input type="radio" name="amount" value="250"/> $250&#8194
    <input type="radio" name="amount" value="other"/> Other
  </form>
</body>

Just Simply Add

checked="checked"

in a declaration of Button Which u want to be default Checked.


<input type="radio" name="amount" value="50" checked="checked"/>