render

type Options struct {
	Width      int    // CSS px viewport width; if <=0 default 1200
	Height     int    // CSS px viewport height; if <=0 grow to fit content
	Scale      int    // device pixel ratio; if <=0 default 2; clamp to 1..4
	Background string // page background if body/html sets none; default "#ffffff"
}

type Result struct {
	PNG      []byte
	Width    int
	Height   int
	Warnings []string
}