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At best, Design View gives a rough approximation of what you can expect to see in browsers. It isn't capable of fully supporting CSS level 3 properties because it isn't a web browser.
Suggest you disable CSS style rendering -- View > Style rendering > un-tick Display Styles. Or use a Design Time Style Sheet.
Use Live View or Preview in browsers to test.
Can't comment on CS6. It isn't out yet.
Alt-Web Design & Publishing
Web | Graphics | Print | Media Specialists
That helped make it readable at least. It may be possible to make templates this way and still be able to see the text for editing content.
What is a Time Style Sheet?