title: What makes an input vulnerable to XSS?
body: <p>I've been reading about XSS and I made a simple form with a text and submit input, but when I execute <code>&lt;script&gt;alert();&lt;/script&gt;</code> on it, nothing happens, the server gets that string and that's all. </p>
  
  <p>What do I have to do for make it vulnerable?? (then I'll learn what I shouldn't do hehe)</p>
  
  <p>Cheers.</p>