I'd recommend copying any particular CSS transitions they use, and looking at the computed properties of components in order to recreate any particular WinJS co

I'd recommend copying any particular CSS transitions they use, and looking at the computed properties of components in order to recreate any particular WinJS components you need. I'd also recommend you evaluate WinJS yourself and see if it fits your needs - but if you suspect you'll be doing anything more that the default then you may not have a fun time.