I found unofficial CSS property "zoom" is implemented on WebKit (Safari and Google Chrome.) And is not implemented on Gecko (Firefox.)

Here is test of CSS zoom. (scale by 200%.) 
<div style="zoom: 2.0; background-color: #ff8;">
Here is test of CSS <code>zoom</code>. (scale by 200%.)
</div>

I think if you wanna scale you SHALL use CSS3 transform as follows:

Here is test of CSS3 transform. (scale by 200%.) 
<div style="transform: scale(2); -webkit-transform: scale(2); -webkit-transform-origin: 0 0; -moz-transform: scale(2); -moz-transform-origin: 0 0; -o-transform: scale(2); -o-transform-origin: 0 0; -ms-transform: scale(2); -ms-transform-origin: 0 0;">
Here is test of CSS3 <code>transform</code>. (scale by 200%.)
</div>

Note that...

  • CSS3 transform is a W3C working draft. So vender prefix (e.g. -webkit-, -moz-, -o-, and/or -ms-) is required.
  • The default value of transform-origin is "50% 50%" (or center center) So I specified transform-origin: 0 0 (or top left) to do the same thing with zoom.