However, could you give and example of how calling autoprefixer programmatically inside resource generator would look like?
No, I have no idea about the autoprefixer API. In terms of GWT you would likely need to copy CssResourceGenerator and GssResourceGenerator and then add autoprefixer in the appropriate places.
But honestly, autoprefixer is a processing tool that should run outside GWT but before the GWT compiler runs. In GWT 3 there are no generators anymore so you would need to run it externally anyways. So you better find a good external solution instead of hacking GWT.
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