I have been trying to apply user-select for both Opera 10.62 and IE9 without success. I can\'t/won\'t bind events with JavaScript that preventDefault()
user-select isn't a standard CSS3 property, which is why there is no user-select or -o-user-select or -ms-user-select. It used to be in the old user interface spec, but that was superseded by the Basic UI spec. It will likely never be implemented by either browser, unless it is added back to the spec.
User selection is a behaviour rather than a style, so it is best to use JavaScript. As Knu mentions above, you can use unselectable instead.