title: body.scrollTop is deprecated?
body: <p>I am using <code>jQuery</code> version <code>1.7.2</code> </p>
  
  <p>I found these lines in Google Chrome Developer Tools:</p>
  
  <pre><code>body.scrollTop is deprecated in strict mode. Please use 'documentElement.scrollTop' if in strict mode and 'body.scrollTop' only if in quirks mode. jquery-1.7.2.min.js:4
  body.scrollLeft is deprecated in strict mode. Please use 'documentElement.scrollLeft' if in strict mode and 'body.scrollLeft' only if in quirks mode. jquery-1.7.2.min.js:4
  event.returnValue is deprecated. Please use the standard event.preventDefault() instead. jquery-1.7.2.min.js:3
  </code></pre>
  
  <p>Is that an error or is it normal? Does it affect my website?</p>