title: What’s the purpose of the HTML "nonce" attribute for script and style elements?
body: <p>W3C says there is a new attribute in HTML5.1 called <code>nonce</code> for <code>style</code> and <code>script</code> that can be used by the Content Security Policy of a website.</p>
  
  <p>I googled about it but finally didn't get it what actually this attribute does and what changes when using it?</p>