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: notfound.go
    path of file: ./repos/go-app/pkg/app
    
    the code of the file until where you have to start completion: package app

var (
	// NotFound is the ui element that is displayed when a request is not
	// routed.
	NotFound UI = &notFound{}
)

type notFound struct {
	Compo
	Icon string
}

func (n *notFound) OnMount(Context) {
	links := Window().Get("document
    
func (n *notFound) OnMount(Context) {
	links := Window().Get("document").Call("getElementsByTagName", "link")

	for i := 0; i < links.Length(); i++ {
		link := links.Index(i)
		rel := link.Call("getAttribute", "rel")

		if rel.String() == "icon" {
			favicon := link.Call("getAttribute", "href")
			n.Icon = favicon.String()
			return
		}
	}
}