I wonder if it is possible to load css3 from that api
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Please note that CSS3 specification is under construction and the most chapters are far from at least stable state (https://www.w3.org/Style/CSS/current-work). However, we have implemented a lot of ‘candidate’ properties when they were requested by customers. So feel free to share the details if you notice problems while working with CSS3 so that we may investigate and assist you accordingly.