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CSS Unused CSS Stages Transitions and Transforms Transitions - WebKit Only

Solution does not transform

This is the solution which passes the challenge:

-webkit-transition: border-radius 2s linear 1s;

Problem is, in the preview browser, it doesn't work. (Chrome Version 32.0.1700.107 m)

When I use the non webkit code, it seems to transition fine, but without a test case I can't be sure I have the correct code because it also won't pass the challenge with both.

It's a minor problem but I thought I totally didn't understand this because I couldn't pass the challenge. What am I doing wrong?