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Check whether a CSS property is supported

Sometimes when using JavaScript, you need to determine whether a certain CSS property is supported by the current browser or not. For instance when setting opacity for an element, you need to find out whether the property that the browser supports is opacity, -moz-opacity (MozOpacity), -khtml-opacity (KhtmlOpacity) or the IE proprietary filter.

Instead of performing a forwards incompatible browser detect, you can easily check which property is supported with a simple conditional.