title: How to access programmatically to a style sheet in webkit engine (Chrome/Safari)
body: <p>In IE with document.getElementById("css_id").styleSheet </p>
  
  <p>or in Firefox document.getElementById("css_id").sheet</p>
  
  <p>I've a style sheet object to manipulate but in Chrome and Safari
  browser that property there is not.</p>
  
  <p>How can I get that object?</p>
  
  <p>Thanks</p>