title: Is there an alternative to the CSS background-size property that works on mobile devices?
body: <p>In CSS3, setting <code>background-size</code> on the background image of a button stretches it to the button height and width.</p>
  
  <p>Is there an alternative to <code>background-size</code>, since my targets are mobile devices, and some don’t support it. I dont want to specify anything in px or em.</p>