class default extends Declarationimport { default } from "https://deno.land/x/postcss_autoprefixer@0.2.4/lib/hacks/align-self.js"; Methodscheck(decl)normalize()Return property name by final spec prefixed(prop, prefix)Change property name for 2012 specs set(decl, prefix)Change value for 2012 spec and ignore prefix for 2009