title: What is default font for elements in html if no font is set in css
body: <p>I want know what is the default font for elements in a html document.<br>
  for example if i use this jquery code :<br>
  <code>var elemfont = jQuery('.elem').css('font-family');</code><br>
  What it returns if there is no font defined in css ?<br>
  And what returns if its parent has a font ?</p>