The list of APIs which Webkit doesn't support(at least in the preview version) is surprisingly small[1]

Chrome is a lot closer to IE in that it incorrectly implements standards to encourage developers and users to priorities it's platform(like a certain company[2])

[1] https://webkit.org/status/#?status=under%20consideration,in%...

[2] https://brattahlid.wordpress.com/2012/05/08/is-docx-really-a...