CSS : Zoom property

The CSS3 equivalent is in the CSS 2D Transforms module, in particular transform: scale().

Because this module is still at Working Draft stage, you'll need browser-specific prefixes:

transform: scale(2);
-moz-transform: scale(2);
-webkit-transform: scale(2);
-o-transform: scale(2);

You may also need transform-origin (and browser-specific versions) to make it behave the same way as zoom, and you'll have to be careful to target zoom only at IE, because WebKit supports bothtransform and zoom so would double-scale.

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