You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: css_table.go
    path of file: ./repos/corteza/server/vendor/github.com/evanw/esbuild/internal/compat
    
    the code of the file until where you have to start completion: package compat

type CSSFeature uint32

const (
	HexRGBA CSSFeature = 1 << iota

	RebeccaPurple

	// This feature includes all of the following:
	// - Allow floats in rgb()
    
func UnsupportedCSSFeatures(constraints map[Engine][]int) (unsupported CSSFeature) {
	for feature, engines := range cssTable {
		for engine, version := range constraints {
			if engine == ES || engine == Node {
				// Specifying "--target=es2020" shouldn't affect CSS
				continue
			}
			if versionRanges, ok := engines[engine]; !ok || !isVersionSupported(versionRanges, version) {
				unsupported |= feature
			}
		}
	}
	return
}