CSSVista is a free Windows application for web developers which lets you edit your CSS code live in both Internet Explorer and Firefox simultaneously. Many designers are interested into browser compatibilities testing solution, but it would be much better if you have the necessary tools to test your design on different browsers in the same time while designing the website so the validation will be much more easy.
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The software even very new, looks very promising and their author announced limitation in the software as it won’t probably work perfectly 100% of the time. In addition to security features that are not covered so don’t use it as a browser and everything will be okay. But as a tool for designers I think it will be very usefull specially if they would add support to more browsers in the future.

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