Its 2018 and email clients that support CSS animations no longer require the -webkit vendor prefix when using the animation CSS property or @keyframes rule.
When kinetic email design started to gain interest around 2014, the primary email client that supported animations was the iPhone email client on iOS 8, which required the -webkit vendor prefix for animations. However later iOS versions (9 and above) no longer require the -webkit prefix. According to this report 99% of Apple devices are now on iOS 9 and above.
With -webkit prefix
This is only a snippet of a Email Marketing Article written by Justin
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